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/** |
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* Site Preloader Frontend Script. |
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* |
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* Handles preloader initialization, hide strategies, and AJAX navigation support. |
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* Apple-inspired smooth interactions. |
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* |
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* @package King_Addons |
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* @since 1.0.0 |
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*/ |
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|
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(function () { |
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'use strict'; |
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|
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/** |
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* Main Preloader Controller |
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*/ |
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const KngPreloader = { |
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|
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/** |
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* Configuration from backend |
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*/ |
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config: { |
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hideStrategy: 'window_load', |
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minDisplayTime: 500, |
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maxDisplayTime: 10000, |
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hideAnimation: 'fade', |
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animationDuration: 400, |
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triggerType: 'always', |
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enableAjax: false, |
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allowSkip: false, |
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skipMethod: 'click', |
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lockScroll: true, |
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cookieDays: 30 |
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}, |
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|
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/** |
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* State management |
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*/ |
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state: { |
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isShowing: true, |
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startTime: 0, |
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hideTimer: null, |
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maxTimer: null |
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}, |
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|
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/** |
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* DOM elements |
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*/ |
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elements: { |
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preloader: null, |
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overlay: null, |
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content: null |
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}, |
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|
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/** |
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* Initialize the preloader |
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*/ |
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init: function () { |
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// Get preloader element |
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this.elements.preloader = document.querySelector('.kng-site-preloader'); |
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|
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if (!this.elements.preloader) { |
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return; |
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} |
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|
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// Get child elements |
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this.elements.overlay = this.elements.preloader.querySelector('.kng-site-preloader__overlay'); |
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this.elements.content = this.elements.preloader.querySelector('.kng-site-preloader__content'); |
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|
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// Parse configuration from data attributes |
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this.parseConfig(); |
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|
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// Record start time |
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this.state.startTime = performance.now(); |
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|
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// Lock scroll if needed |
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if (this.config.lockScroll) { |
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document.body.classList.add('kng-preloader-no-scroll'); |
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} |
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|
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// Set up skip key listener |
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this.setupSkipKey(); |
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|
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// Set up hide strategy |
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this.setupHideStrategy(); |
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|
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// Set up maximum display time failsafe |
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this.setupMaxTimeout(); |
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|
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// Set up AJAX navigation support (Pro feature) |
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if (this.config.enableAjax) { |
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this.setupAjaxNavigation(); |
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} |
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|
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// Expose API |
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window.KngPreloader = this; |
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}, |
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|
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/** |
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* Parse configuration from data attributes |
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*/ |
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parseConfig: function () { |
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const dataset = this.elements.preloader.dataset; |
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|
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if (dataset.hideStrategy) { |
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this.config.hideStrategy = dataset.hideStrategy; |
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} |
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if (dataset.minDisplayTime) { |
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this.config.minDisplayTime = parseInt(dataset.minDisplayTime, 10); |
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} |
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if (dataset.maxDisplayTime) { |
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this.config.maxDisplayTime = parseInt(dataset.maxDisplayTime, 10); |
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} |
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if (dataset.hideAnimation) { |
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this.config.hideAnimation = dataset.hideAnimation; |
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} |
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if (dataset.animationDuration) { |
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this.config.animationDuration = parseInt(dataset.animationDuration, 10); |
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} |
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if (dataset.triggerType) { |
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this.config.triggerType = dataset.triggerType; |
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} |
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if (dataset.enableAjax) { |
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this.config.enableAjax = dataset.enableAjax === 'true'; |
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} |
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if (dataset.allowSkip) { |
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this.config.allowSkip = dataset.allowSkip === 'true'; |
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} |
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if (dataset.skipMethod) { |
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this.config.skipMethod = dataset.skipMethod; |
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} |
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if (dataset.lockScroll !== undefined) { |
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this.config.lockScroll = dataset.lockScroll === 'true'; |
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} |
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}, |
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|
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/** |
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* Set up hide strategy based on configuration |
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*/ |
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setupHideStrategy: function () { |
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switch (this.config.hideStrategy) { |
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case 'dom_ready': |
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', () => this.requestHide()); |
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} else { |
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this.requestHide(); |
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} |
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break; |
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|
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case 'window_load': |
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if (document.readyState === 'complete') { |
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this.requestHide(); |
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} else { |
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window.addEventListener('load', () => this.requestHide()); |
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} |
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break; |
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|
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case 'timeout': |
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this.state.hideTimer = setTimeout(() => { |
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this.requestHide(); |
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}, this.config.minDisplayTime); |
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break; |
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|
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case 'custom': |
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// Wait for external call to hide() |
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break; |
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|
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default: |
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window.addEventListener('load', () => this.requestHide()); |
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} |
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}, |
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|
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/** |
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* Set up maximum display time failsafe |
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*/ |
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setupMaxTimeout: function () { |
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this.state.maxTimer = setTimeout(() => { |
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if (this.state.isShowing) { |
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console.warn('[KngPreloader] Max display time reached, forcing hide'); |
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this.hide(); |
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} |
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}, this.config.maxDisplayTime); |
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}, |
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|
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/** |
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* Set up skip functionality based on config |
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*/ |
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setupSkipKey: function () { |
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if (!this.config.allowSkip) { |
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return; |
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} |
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|
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const skipMethod = this.config.skipMethod || 'click'; |
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|
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if (skipMethod === 'click') { |
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// Skip on click anywhere |
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const handleClick = () => { |
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if (this.state.isShowing) { |
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this.hide(); |
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document.removeEventListener('click', handleClick); |
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} |
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}; |
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document.addEventListener('click', handleClick); |
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} else if (skipMethod === 'escape') { |
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// Skip on Escape key |
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const handleKeyDown = (e) => { |
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if (e.key === 'Escape' && this.state.isShowing) { |
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this.hide(); |
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document.removeEventListener('keydown', handleKeyDown); |
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} |
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}; |
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document.addEventListener('keydown', handleKeyDown); |
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} |
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}, |
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|
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/** |
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* Request hide with minimum display time check |
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*/ |
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requestHide: function () { |
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const elapsed = performance.now() - this.state.startTime; |
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const remaining = this.config.minDisplayTime - elapsed; |
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|
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if (remaining > 0) { |
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this.state.hideTimer = setTimeout(() => this.hide(), remaining); |
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} else { |
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this.hide(); |
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} |
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}, |
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|
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/** |
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* Hide the preloader |
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*/ |
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hide: function () { |
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if (!this.state.isShowing || !this.elements.preloader) { |
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return; |
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} |
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|
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this.state.isShowing = false; |
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|
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// Clear timers |
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if (this.state.hideTimer) { |
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clearTimeout(this.state.hideTimer); |
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} |
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if (this.state.maxTimer) { |
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clearTimeout(this.state.maxTimer); |
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} |
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|
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// Set CSS animation duration variable |
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this.elements.preloader.style.setProperty('--kng-preloader-transition', this.config.animationDuration + 'ms'); |
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|
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// Apply hide animation |
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const animationClass = this.getHideAnimationClass(); |
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this.elements.preloader.classList.add('kng-site-preloader--hidden', animationClass); |
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|
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// Unlock scroll after animation completes |
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setTimeout(() => { |
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document.body.classList.remove('kng-preloader-no-scroll'); |
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this.elements.preloader.style.display = 'none'; |
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|
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// Set cookie based on trigger type |
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this.setTriggerCookie(); |
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|
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// Trigger custom event |
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document.dispatchEvent(new CustomEvent('kngPreloaderHidden', { |
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detail: { |
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displayTime: performance.now() - this.state.startTime |
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} |
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})); |
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}, this.config.animationDuration); |
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}, |
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|
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/** |
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* Get hide animation CSS class |
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*/ |
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getHideAnimationClass: function () { |
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const animations = { |
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'fade': 'kng-site-preloader--fade-out', |
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'slide_up': 'kng-site-preloader--slide-up', |
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'blur': 'kng-site-preloader--blur-out', |
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'scale': 'kng-site-preloader--scale-out' |
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}; |
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|
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return animations[this.config.hideAnimation] || animations['fade']; |
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}, |
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|
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/** |
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* Show the preloader (for AJAX navigation) |
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*/ |
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show: function () { |
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if (this.state.isShowing || !this.elements.preloader) { |
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return; |
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} |
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|
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this.state.isShowing = true; |
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this.state.startTime = performance.now(); |
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|
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// Remove hide classes |
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this.elements.preloader.classList.remove( |
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'kng-site-preloader--hidden', |
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'kng-site-preloader--fade-out', |
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'kng-site-preloader--slide-up', |
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'kng-site-preloader--blur-out', |
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'kng-site-preloader--scale-out' |
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); |
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|
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// Show preloader |
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this.elements.preloader.style.display = 'flex'; |
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this.elements.preloader.classList.add('kng-site-preloader--fade-in'); |
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|
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// Lock scroll |
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document.body.classList.add('kng-preloader-no-scroll'); |
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|
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// Set up max timeout again |
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this.setupMaxTimeout(); |
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|
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// Trigger custom event |
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document.dispatchEvent(new CustomEvent('kngPreloaderShown')); |
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}, |
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|
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/** |
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* Set cookie based on trigger type |
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*/ |
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setTriggerCookie: function () { |
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if (this.config.triggerType === 'always') { |
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return; |
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} |
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|
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const cookieName = 'kng_preloader_shown'; |
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let expires = ''; |
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|
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if (this.config.triggerType === 'once') { |
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// Set cookie for specified days |
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const date = new Date(); |
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date.setTime(date.getTime() + (this.config.cookieDays * 24 * 60 * 60 * 1000)); |
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expires = '; expires=' + date.toUTCString(); |
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} else if (this.config.triggerType === 'session') { |
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// Session cookie (no expires = session only) |
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expires = ''; |
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} |
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|
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document.cookie = cookieName + '=1' + expires + '; path=/; SameSite=Lax'; |
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}, |
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|
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/** |
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* Check if preloader should be shown based on cookie |
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*/ |
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shouldShow: function () { |
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if (this.config.triggerType === 'always') { |
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return true; |
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} |
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|
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const cookies = document.cookie.split(';'); |
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for (let i = 0; i < cookies.length; i++) { |
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const cookie = cookies[i].trim(); |
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if (cookie.startsWith('kng_preloader_shown=')) { |
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return false; |
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} |
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} |
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return true; |
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}, |
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|
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/** |
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* Set up AJAX navigation support (Pro feature) |
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*/ |
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setupAjaxNavigation: function () { |
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// Intercept link clicks |
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document.addEventListener('click', (e) => { |
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const link = e.target.closest('a'); |
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if (!link || !this.isInternalLink(link.href)) { |
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return; |
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} |
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|
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// Check for external link indicators |
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if (link.target === '_blank' || link.hasAttribute('download')) { |
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return; |
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} |
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|
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// Exclude admin links and WP-specific URLs |
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const href = link.href; |
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if (href.includes('/wp-admin') || |
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href.includes('/wp-login') || |
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href.includes('#') || |
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href.includes('?') && href.includes('action=')) { |
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return; |
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} |
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|
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// Show preloader for internal navigation |
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e.preventDefault(); |
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this.show(); |
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|
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// Navigate after short delay |
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setTimeout(() => { |
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window.location.href = href; |
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}, 200); |
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}); |
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|
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// Handle browser back/forward |
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window.addEventListener('popstate', () => { |
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this.show(); |
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}); |
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|
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// Handle page show event (for bfcache) |
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window.addEventListener('pageshow', (e) => { |
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if (e.persisted) { |
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this.hide(); |
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} |
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}); |
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}, |
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|
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/** |
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* Check if URL is internal |
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*/ |
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isInternalLink: function (url) { |
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try { |
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const linkUrl = new URL(url); |
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return linkUrl.hostname === window.location.hostname; |
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} catch (e) { |
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return false; |
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} |
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}, |
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|
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/** |
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* Update progress (for custom progress bars) |
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*/ |
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setProgress: function (percent) { |
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const progressBar = this.elements.preloader.querySelector('[data-progress-bar]'); |
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if (progressBar) { |
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progressBar.style.width = Math.min(100, Math.max(0, percent)) + '%'; |
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} |
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}, |
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|
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/** |
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* Update loading text |
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*/ |
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setText: function (text) { |
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const textElement = this.elements.preloader.querySelector('.kng-site-preloader__text'); |
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if (textElement) { |
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textElement.textContent = text; |
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} |
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}, |
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|
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/** |
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* Destroy preloader |
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*/ |
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destroy: function () { |
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if (this.state.hideTimer) { |
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clearTimeout(this.state.hideTimer); |
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} |
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if (this.state.maxTimer) { |
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clearTimeout(this.state.maxTimer); |
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} |
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|
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if (this.elements.preloader) { |
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this.elements.preloader.remove(); |
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} |
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|
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document.body.classList.remove('kng-preloader-no-scroll'); |
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this.elements.preloader = null; |
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} |
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}; |
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|
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// Initialize when DOM is ready |
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', () => KngPreloader.init()); |
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} else { |
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KngPreloader.init(); |
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} |
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|
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// Expose globally for external control |
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window.KngPreloader = KngPreloader; |
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|
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})(); |
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|
