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/**
* IAS Trigger Extension
* An IAS extension to show a trigger link to load the next page
* https://infiniteajaxscroll.com
*
* This file is part of the Infinite AJAX Scroll package
*
* Copyright 2014-2018 Webcreate (Jeroen Fiege)
*/
var IASTriggerExtension = function(options) {
options = jQuery.extend({}, this.defaults, options);
this.ias = null;
this.html = (options.html).replace('{text}', options.text);
this.htmlPrev = (options.htmlPrev).replace('{text}', options.textPrev);
this.enabled = true;
this.count = 0;
this.offset = options.offset;
this.$triggerNext = null;
this.$triggerPrev = null;
/**
* Shows trigger for next page
*/
this.showTriggerNext = function() {
if (!this.enabled) {
return true;
}
if (false === this.offset || ++this.count < this.offset) {
return true;
}
var $trigger = this.$triggerNext || (this.$triggerNext = this.createTrigger(this.next, this.html));
var $lastItem = this.ias.getLastItem();
$lastItem.after($trigger);
$trigger.fadeIn();
return false;
};
/**
* Shows trigger for previous page
*/
this.showTriggerPrev = function() {
if (!this.enabled) {
return true;
}
var $trigger = this.$triggerPrev || (this.$triggerPrev = this.createTrigger(this.prev, this.htmlPrev));
var $firstItem = this.ias.getFirstItem();
$firstItem.before($trigger);
$trigger.fadeIn();
return false;
};
this.onRendered = function() {
this.enabled = true;
};
/**
* @param clickCallback
* @returns {*|jQuery}
* @param {string} html
*/
this.createTrigger = function(clickCallback, html) {
var uid = (new Date()).getTime(),
$trigger;
html = html || this.html;
$trigger = jQuery(html).attr('id', 'ias_trigger_' + uid);
$trigger.hide();
$trigger.on('click', jQuery.proxy(clickCallback, this));
return $trigger;
};
return this;
};
/**
* @public
* @param {object} ias
*/
IASTriggerExtension.prototype.bind = function(ias) {
var self = this;
this.ias = ias;
ias.on('next', jQuery.proxy(this.showTriggerNext, this), this.priority);
ias.on('rendered', jQuery.proxy(this.onRendered, this), this.priority);
try {
ias.on('prev', jQuery.proxy(this.showTriggerPrev, this), this.priority);
} catch (exception) {}
};
/**
* @public
* @param {object} ias
*/
IASTriggerExtension.prototype.unbind = function(ias) {
ias.off('next', this.showTriggerNext);
ias.off('rendered', this.onRendered);
try {
ias.off('prev', this.showTriggerPrev);
} catch (exception) {}
};
/**
* @public
*/
IASTriggerExtension.prototype.next = function() {
this.enabled = false;
this.ias.pause();
if (this.$triggerNext) {
this.$triggerNext.remove();
this.$triggerNext = null;
}
this.ias.next();
};
/**
* @public
*/
IASTriggerExtension.prototype.prev = function() {
this.enabled = false;
this.ias.pause();
if (this.$triggerPrev) {
this.$triggerPrev.remove();
this.$triggerPrev = null;
}
this.ias.prev();
};
/**
* @public
*/
IASTriggerExtension.prototype.defaults = {
text: 'Load more items',
html: '<div class="ias-trigger ias-trigger-next" style="text-align: center; cursor: pointer;"><a>{text}</a></div>',
textPrev: 'Load previous items',
htmlPrev: '<div class="ias-trigger ias-trigger-prev" style="text-align: center; cursor: pointer;"><a>{text}</a></div>',
offset: 0
};
/**
* @public
* @type {number}
*/
IASTriggerExtension.prototype.priority = 1000;