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POPreventing a form post submit download from cancelling Ajax actions
 

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    <p>I have a button <strong>[Download Document]</strong> which does these two things:</p> <ol> <li>Makes an ajax call and populates a table with data.</li> <li><p><code>Post</code> submits a form which:</p> <p>a. Runs a back-end script that creates a document</p> <p>b. Returns the document to the browser in a way that the browser downloads the document.</p></li> </ol> <p>One problem. The <code>post</code> submit is not ajax, which means that the browser treats it the same way as clicking on a link, refreshing a page, or closing the window, <strong>e.g. it cancels the ajax request without even getting a response error</strong>.</p> <p>Using <code>.preventDefault()</code> on the button doesn't work. It does allow the ajax call (<strong>1</strong>) to complete successfully, but then the form isn't submitted, so (<strong>2</strong>) the form is never submitted.</p> <pre><code> &lt;form action="/backendScript" method="post"&gt; &lt;input type="submit" value="Download Document"&gt; &lt;/form&gt; $(".downloadBtn").on("click", function (e) { generateTable(); e.preventDefault(); // without this, the ajax in generateTable(); is cancelled, but with it, the form isn't submitted. }); </code></pre> <p>Doing (<strong>2</strong>) with an ajax <code>post</code> also doesn't work. It can complete (<strong>2.a</strong>), but the returned document goes straight to Javascript, instead of the browser, and Javascript isn't able to cause a download event, so (<strong>2.b</strong>) fails with this approach.</p> <pre><code> $.post("/backendScript", formData, function (generatedDoc) { console.log(generatedDoc); //yay, here's our doc! but how do we download it?? }); </code></pre> <p>So it looks like I <em>must</em> <code>post</code> submit the form. But how can I prevent this from canceling any ajax requests that are in progress?</p>
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    1. USbrentonstrine
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    1. COYou should add the form attribute target="_blank". This way the download can start immediately and the ajax calls are not cancelled
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      1. USuser1333371
 

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