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[livejournal] r17567: LJSUP-6781: add widget javascript code

Committer: dpetrov
LJSUP-6781: add widget javascript code
A   trunk/htdocs/js/widgets/photos2homepage.js
Added: trunk/htdocs/js/widgets/photos2homepage.js
===================================================================
--- trunk/htdocs/js/widgets/photos2homepage.js	                        (rev 0)
+++ trunk/htdocs/js/widgets/photos2homepage.js	2010-10-15 02:10:40 UTC (rev 17567)
@@ -0,0 +1,61 @@
+var Photos2HomepageWidget = {
+	init: function(){
+		var widget = jQuery('.appwidget-photos2homepage');
+		this.controls = {
+			prev: widget.find('.i-potd-nav-prev'),
+			next: widget.find('.i-potd-nav-next')
+		};
+
+		var images = this.images = [];
+		widget.find('.pic-list > li').each(function(){
+			images.push({
+				img: this.getElementsByTagName('img')[0],
+				link: this.getElementsByTagName('a')[0],
+				li: this
+				});
+		});
+
+		this.page = 1;
+		this.pages = Math.ceil( photos2homepage.length / photos_per_page );
+		this.ppCount = photos_per_page;
+
+		//preload thumbnails
+		this.imageHash = [];
+		for( var i = 0; i < photos2homepage.length; ++i){
+			this.imageHash[ i ] = new Image();
+			this.imageHash[ i ].src = photos2homepage[ i ].src;
+		}
+	},
+
+	prev: function(){
+		if(this.page == 1) return;
+		this.page--;
+		this._updatePager();
+	},
+
+	next: function(){
+		if(this.page == this.pages) return;
+		this.page++;
+		this._updatePager();
+	},
+
+	_updatePager: function(){
+		this.controls.prev[(this.page == 1)?"addClass":"removeClass"]('i-potd-nav-prev-dis');
+		this.controls.next[(this.page == this.pages)?"addClass":"removeClass"]('i-potd-nav-next-dis');
+
+		var idx = 0;
+		for( var i = 0; i < this.ppCount; ++i ){
+			idx = i + this.ppCount * (this.page - 1);
+
+			if( idx < photos2homepage.length ){
+				this.images[ i ].img.src = this.imageHash[ idx ].src;
+				this.images[ i ].link.href = photos2homepage[ idx ].url;
+				this.images[ i ].link.title = photos2homepage[ idx ].title;
+
+				this.images[ i ].li.style.display = '';
+			}
+			else
+				this.images[ i ].li.style.display = 'none';
+		}
+	}
+}

Tags: can3p, js, livejournal
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