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POjQuery AJAX and handling different dataTypes
 

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    <p>I'm using ASP.Net MVC, but this applies to any framework. </p> <p>I'm making an Ajax call to my server, which most of the time returns plain old HTML, however if there is an error, I'd like it to return a JSON object with a status message (and a few other things). There doesn't appear to be a way for the <code>dataType</code> option in the jQuery call to handle this well. By default it seems to parse everything as html, leading to a <code>&lt;div&gt;</code> being populated with <code>"{ status: 'error', message: 'something bad happened'}"</code>.</p> <p>[Edit] Ignoring the <code>dataType</code> object and letting jQuery figure out doesn't work either. It views the type of the result as a <code>string</code> and treats it as HTML.</p> <p>One solution I came up with is to attempt to parse the result object as JSON. If that works we know it's a JSON object. If it throws an exception, it's HTML:</p> <pre><code>$.ajax({ data: {}, success: function(data, textStatus) { try { var errorObj = JSON.parse(data); handleError(errorObj); } catch(ex) { $('#results').html(data); } }, dataType: 'html', // sometimes it is 'json' :-/ url: '/home/AjaxTest', type: 'POST' }); </code></pre> <p>However, using an Exception in that way strikes me as pretty bad design (and unintuitive to say the least). Is there a better way? I thought of wrapping the entire response in a JSON object, but in this circumstance, I don't think that's an option.</p> <p>Here's the solution that I got from Steve Willcock:</p> <pre><code>// ASP.NET MVC Action: [AcceptVerbs(HttpVerbs.Post)] public ActionResult AjaxTest(int magic) { try { var someVal = GetValue(); return PartialView("DataPage", someVal); } catch (Exception ex) { this.HttpContext.Response.StatusCode = 500; return Json(new { status = "Error", message = ex.Message }); } } // jQuery call: $.ajax({ data: {}, success: function(data, textStatus) { $('#results').html(data); }, error: function() { var errorObj = JSON.parse(XMLHttpRequest.responseText); handleError(errorObj); }, dataType: 'html', url: '/home/AjaxTest', type: 'POST' }); </code></pre>
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    1. COHmmm, interesting situation, but I don't know if having a method return different types is the best idea - maybe you should have the first method return a bool, and then in the $.ajax callback you can call another method that will return the status message.
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      1. USGabriel Florit
 

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