Upgrade to ExtJS 4.0.0 - Released 04/26/2011

[extjs.git] / examples / app / feed-viewer / app / lib / FeedValidator.js

diff --git a/examples/app/feed-viewer/app/lib/FeedValidator.js b/examples/app/feed-viewer/app/lib/FeedValidator.js
new file mode 100644 (file)
index 0000000..c7dd55a
--- /dev/null
+++ b/examples/app/feed-viewer/app/lib/FeedValidator.js
@@ -0,0 +1,61 @@
+Ext.define('FV.lib.FeedValidator', {
+    singleton: true,
+    
+    /**
+     * @cfg {String} url The url to validate feeds on
+     */
+    url: 'feed-proxy.php',
+    
+    /**
+     * Validates a given feed's formating by fetching it and ensuring it is well formed
+     * @param {FV.model.Feed} feed The feed to validate
+     */
+    validate: function(feed, options) {
+        options = options || {};
+        
+        Ext.applyIf(options, {
+            scope: this,
+            success: Ext.emptyFn,
+            failure: Ext.emptyFn
+        });
+        
+        Ext.Ajax.request({
+            url: this.url,
+            params: {
+                feed: feed.get('url')
+            },
+            scope: this,
+            success: function(response) {
+                if (this.checkResponse(response, feed)) {
+                    options.success.call(options.scope, feed);
+                }
+            },
+            failure: function() {
+                options.failure.call(options.scope);
+            }
+        });
+    },
+    
+    /**
+     * @private
+     * Validates that a response contains a well-formed feed
+     * @param {Object} response The response object
+     */
+    checkResponse: function(response, feed) {
+        var dq  = Ext.DomQuery,
+            url = feed.get('url'),
+            xml, channel, title;
+
+        try {
+            xml = response.responseXML;
+            channel = xml.getElementsByTagName('channel')[0];
+            
+            if (channel) {
+                title = dq.selectValue('title', channel, url);
+                return true;
+            }
+        } catch(e) {
+        }
+        return false;
+    }
+});
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