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    <p><strong>Q2</strong> use canvas.toBlob instead of canvas.mozGetAsFile. <a href="https://github.com/blueimp/JavaScript-Canvas-to-Blob" rel="nofollow">There is a polyfill to increase browser compatibility.</a> </p> <p>Usage as show in their page</p> <pre><code>var canvas = document.createElement('canvas'); canvas.toBlob( function (blob) { // the blob is the jpeg file var formData = new FormData(); formData.append('file', blob, fileName); /* ... */ }, 'image/jpeg' ); </code></pre> <p><strong>Q4</strong> specify <code>canvas.toBlob(callback, 'image/jpeg', quality)</code> where quality is from 0.0 to 1.0 (highest quality)</p> <p><strong>Q3</strong> you can have multiple buttons in a form.</p> <pre><code>&lt;form&gt; &lt;input id="file" type="file" name="file" multiple/&gt;&lt;br/&gt; &lt;input id="confirm" type="checkbox" name="confirm"&gt;confirm&lt;/input&gt;&lt;br/&gt; ... &lt;input name="upload" value="Upload" type="button"/&gt; &lt;input name="upload-resize" value="Upload and resize" type="button"/&gt; &lt;/form&gt; </code></pre> <p>Note that the form tag doesn't contain the onsubmit attribute and the input type is now button instead of submit.</p> <pre><code> &lt;input name="upload" value="Upload" type="button" onclick="myfunction()"/&gt; </code></pre> <p>or instead of onclick attribute, you can use addEventListener, etc.</p> <p><strong>Q1</strong> You shoudn't go back in the history. Your location.reload() is correct but it must be done after the send/upload is completed.</p> <pre><code>xhr.onreadystatechange = function() { if (xhr.readyState != 4) { return; } location.reload(); } </code></pre> <p><a href="http://ajaxpatterns.org/XMLHttpRequest_Call" rel="nofollow">XMLHttpRequest</a> is asynchronous so the send method returns even before the upload has completed! To know if the send has finished, use onreadystatechange as shown above.</p> <p>Note: you may want to check the response status code too.</p>
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    1. POHow to resize images on client, not working
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    1. COThanks, toBlob worked on Firefox, but not Chrome, etc. I suppose I need to look into the polyfill, but it broke the page reloading, if I call history(0), then it fails, my guess is the reload occurs before its finished
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    2. COAdded an answer for Q1 which doesn't use the history
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    3. COThanks that worked
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Guidance
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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