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POHow to display a JSON error message?
 

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  1. POHow to display a JSON error message?
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    <p>I'm currently developing a tumblr theme and have built a jQuery JSON thingamabob that uses the Tumblr API to do the following:</p> <p>The user would click on the "post type" link (e.g. Video Posts), at which stage jQuery would use JSON to grab all the posts that's related to that type and then dynamically display them in a designated area.</p> <p>Now everything works absolutely peachy, except that with Tumblr being Tumblr and their servers taking a knock every now and then, the Tumblr API thingy is sometimes offline. Now I can't foresee when this function will be down, which is why I want to display some generic error message if JSON (for whatever reason) was unable to load the post.</p> <p>You'll see I've already written some code to show an error message when jQuery can't find any posts related to that post type BUT it doesn't cover any server errors. Note: I sometimes get this error:</p> <p><strong>Failed to load resource: the server responded with a status of 503 (Service Temporarily Unavailable)</strong></p> <p>It is for this 503 Error message that I need to write some code, but I'm slightly clueless :)</p> <p>Here's the jQuery JSON code:</p> <pre><code>$('ul.right li').find('a').click(function() { var postType = this.className; var count = 0; byCategory(postType); return false; function byCategory(postType, callback) { $.getJSON('{URL}/api/read/json?type=' + postType + '&amp;callback=?', function(data) { var article = []; $.each(data.posts, function(i, item) { // i = index // item = data for a particular post switch(item.type) { case 'photo': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="photo" style="padding-bottom:5px;"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/XSTldh6ds/photo_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;a href="' + item.url + '" title="{Title}"&gt;&lt;img src="' + item['photo-url-500'] + '"alt="image" /&gt;&lt;/a&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'video': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="video" style="padding-bottom:5px;"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;' + '&lt;img src="http://static.tumblr.com/ewjv7ap/nuSldhclv/video_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;span style="margin: auto;"&gt;' + item['video-player'] + '&lt;/span&gt;' + '&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'audio': if (use_IE == true) { article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/R50ldh5uj/audio_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['id3-artist'] +' - ' + item['id3-title'] + '&lt;/a&gt;&lt;/h3&gt;' + '&lt;/div&gt;&lt;/div&gt;'; } else { article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/R50ldh5uj/audio_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['id3-artist'] +' - ' + item['id3-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;div class="player"&gt;' + item['audio-player'] + '&lt;/div&gt;' + '&lt;/div&gt;&lt;/div&gt;'; }; count = 1; break; case 'regular': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/dwxldhck1/regular_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['regular-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;div class="description_container"&gt;' + item['regular-body'] + '&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'quote': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="quote"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/loEldhcpr/quote_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;blockquote&gt;&lt;h3&gt;&lt;a href="' + item.url + '" title="{Title}"&gt;' + item['quote-text'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/blockquote&gt;&lt;cite&gt;- ' + item['quote-source'] + '&lt;/cite&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'conversation': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="chat"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/MVuldhcth/conversation_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['conversation-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'link': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="link"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/EQGldhc30/link_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item['link-url'] + '" target="_blank"&gt;' + item['link-text'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; default: alert('No Entries Found.'); }; }) // end each if (!(count == 0)) { $('#content_right') .hide('fast') .html('&lt;div class="first_div"&gt;&lt;span class="left_corner"&gt;&lt;/span&gt;&lt;span class="right_corner"&gt;&lt;/span&gt;&lt;h2&gt;Displaying ' + postType + ' Posts Only&lt;/h2&gt;&lt;/div&gt;' + article.join('')) .slideDown('fast') } else { $('#content_right') .hide('fast') .html('&lt;div class="first_div"&gt;&lt;span class="left_corner"&gt;&lt;/span&gt;&lt;span class="right_corner"&gt;&lt;/span&gt;&lt;h2&gt;Hmmm, currently there are no ' + postType + ' posts to display&lt;/h2&gt;&lt;/div&gt;') .slideDown('fast') } // end getJSON }); // end byCategory } }); </code></pre> <p>If you'd like to see the demo in action, check out <a href="http://elegantem.tumblr.com/" rel="nofollow">Elegantem</a> but do note that everything might work absolutely fine for you (or not), depending on Tumblr's temperament.</p> <p><hr /> <strong>Update</strong> Okay, so after following jmorts answer underneath as close to the letter as 2am allows, I've churned out the following code without success - there's no alert popping up. Myabe I'm a muppet, maybe I'm just scheleeeepy but if you jedi folks can take another peek I'd really appreciate it :)</p> <pre><code>$('ul.right li').find('a').click(function() { var postType = this.className; var count = 0; byCategory(postType); return false; function byCategory(postType, callback) { $.getJSON('{URL}/api/read/json?type=' + postType + '&amp;callback=?', function(data, textStatus, xhr) { // main callback function if(xhr.status == 500 || xhr.status == 404 || xhr.status == 503) { yourErrorHandler(data, textStatus, xhr); // success } else { yourCallbackToRunIfSuccessful(data); // failed } } ); function yourCallbackToRunIfSuccessful(data) { var article = []; $.each(data.posts, function(i, item) { // i = index // item = data for a particular post switch(item.type) { case 'photo': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="photo" style="padding-bottom:5px;"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/XSTldh6ds/photo_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;a href="' + item.url + '" title="{Title}"&gt;&lt;img src="' + item['photo-url-500'] + '"alt="image" /&gt;&lt;/a&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'video': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="video" style="padding-bottom:5px;"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;' + '&lt;img src="http://static.tumblr.com/ewjv7ap/nuSldhclv/video_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;span style="margin: auto;"&gt;' + item['video-player'] + '&lt;/span&gt;' + '&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'audio': if (use_IE == true) { article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/R50ldh5uj/audio_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['id3-artist'] +' - ' + item['id3-title'] + '&lt;/a&gt;&lt;/h3&gt;' + '&lt;/div&gt;&lt;/div&gt;'; } else { article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/R50ldh5uj/audio_icon.png" alt="type_icon"/&gt;&lt;/a&gt;' + '&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['id3-artist'] +' - ' + item['id3-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;div class="player"&gt;' + item['audio-player'] + '&lt;/div&gt;' + '&lt;/div&gt;&lt;/div&gt;'; }; count = 1; break; case 'regular': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="regular"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/dwxldhck1/regular_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['regular-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;div class="description_container"&gt;' + item['regular-body'] + '&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'quote': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="quote"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/loEldhcpr/quote_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;blockquote&gt;&lt;h3&gt;&lt;a href="' + item.url + '" title="{Title}"&gt;' + item['quote-text'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/blockquote&gt;&lt;cite&gt;- ' + item['quote-source'] + '&lt;/cite&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'conversation': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="chat"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/MVuldhcth/conversation_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item.url + '"&gt;' + item['conversation-title'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; case 'link': article[i] = '&lt;div class="post_wrap"&gt;&lt;div class="link"&gt;' + '&lt;a href="' + item.url + '" title="{Title}" class="type_icon"&gt;&lt;img src="http://static.tumblr.com/ewjv7ap/EQGldhc30/link_icon.png" alt="type_icon"/&gt;&lt;/a&gt;&lt;h3&gt;&lt;a href="' + item['link-url'] + '" target="_blank"&gt;' + item['link-text'] + '&lt;/a&gt;&lt;/h3&gt;&lt;/div&gt;&lt;/div&gt;'; count = 1; break; default: alert('No Entries Found.'); }; }) // end each if (!(count == 0)) { $('#content_right') .hide('fast') .html('&lt;div class="first_div"&gt;&lt;span class="left_corner"&gt;&lt;/span&gt;&lt;span class="right_corner"&gt;&lt;/span&gt;&lt;h2&gt;Displaying ' + postType + ' Posts Only&lt;/h2&gt;&lt;/div&gt;' + article.join('')) .slideDown('fast') } else { $('#content_right') .hide('fast') .html('&lt;div class="first_div"&gt;&lt;span class="left_corner"&gt;&lt;/span&gt;&lt;span class="right_corner"&gt;&lt;/span&gt;&lt;h2&gt;Hmmm, currently there are no ' + postType + ' posts to display&lt;/h2&gt;&lt;/div&gt;') .slideDown('fast') } // end getJSON }; // end byCategory function yourErrorHandler(data,textStatus,xhr) { alert("Server returned status code " + xhr.status + ". Try again later."); } } }); </code></pre>
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    1. CONote that JSON is the notation of JavaScript Objects, not a way of requesting data. You may change your question to talk about AJAX instead of JSON, as JSON isn't important in this question.
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    2. COI think you've misunderstood what JSON is. JSON is a data representation format; you're probably referring to XmlHttpRequest (commonly known as "AJAX" for some reason).
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      1. USLightness Races in Orbit
    3. CO@Time Machine - Good point. JSON is just a data transport, like XML. Whereas AJAX is a technique for retrieving data from a server without reloading the page, and can return data in XML, JSON, HTML, plain text, and may other formats, despite the fact that the 'X' in AJAX stands for 'XML'.
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      1. USjmort253
 

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