StackOverflow2013

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POJSON data if/else parse
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copied!<p>I am doing some long polling (ajax) and I am looping the following portion of code.. There is code being executed above and below. This code is part of an internal messaging system. A certain portion of the page wil blink when a message arrives. If the user checks the message, it will remove the dash_notify from the JSON response, which needs to turn off the blinking. See below:</p> <pre><code>if (data.dash_notify == '1') { var x = '#dash_notif_blink'; function blinking(x) { timer = setInterval(blink, 10); function blink() { x.fadeOut(400, function () { x.fadeIn(400); }); } } console.log("initiate_dash"); blinking($(x)); } else if (!data.dash_notify) { console.log("good"); clearInterval(timer); } </code></pre> <p>The following JSON response that gets sent to this code is:</p> <pre><code>{"current_date_time":"January 8, 2013 - 4:02 pm","dash_notify":"1"} </code></pre> <p>It understand the initial blink IF the above data gets passed. If the following gets passed:</p> <pre><code>{"current_date_time":"January 8, 2013 - 4:02 pm"} </code></pre> <p>Then it throws an error: </p> <pre><code>Uncaught ReferenceError: timer is not defined </code></pre> <p>I cannot figure out how to fix the "else" portion working properly. If the code is initiated when the full dash_notify:1 response is sent, it works perfect. The button will blink, then if the user checks the message, it will no longer send dash_notify:1 and the button stops blinking. But if the code is initiated when dash_notify:1 is NOT set, it doesn't know what to do with the ClearInterval. </p> <p>Basically I need the else portion fixed.</p> <p>I have tried using different typeOf === undefined snippets, but it doesn't work.</p> <p>Any help is appreciated.</p> <p>Thank you!</p> <p><strong>EDIT:</strong></p> <p>This is currently working.. Timer is now defined above the statement</p> <pre><code>if(data.dash_notify == '1'){ var x = '#dash_notif_blink'; console.log("initiate_dash"); blinking($(x)); }else if (typeof timer != "undefined" && timer) { clearInterval(timer); } } </code></pre> <p>This is working, but sometimes it trys to kill the timer but it doesn't actually do it. This happens every so often.</p>

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