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PONull parameters doing HTTP POST from Ajax to Web API
 

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  1. PONull parameters doing HTTP POST from Ajax to Web API
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    <p>I've read several StackOverflow posts about this and corrected my code several times but I cant get my webAPI post method to work. I'm trying to receive a post parameter but it comes always null.</p> <p>What I am trying to do is receiving a base64 string that represents a canvas that is creating with jquery when the user clicks the button:</p> <pre><code>function MakePhoto(ctrl) { html2canvas(ctrl, { onrendered: function (canvas) { var canvasData = canvas.toDataURL() jQuery.ajax({ url: "../api/webinfo", type: "POST", data: { imagedata: canvasData }, success: function () { alert("success"); }, error: function () { alert("failure"); } }); } }); } </code></pre> <p>my <code>WebInfoController.cs</code> looks like this:</p> <pre><code> public void Post([FromBody]string imagedata) { } </code></pre> <p>imagedata parameter comes always <strong>NULL</strong></p> <p>And this are the headers I am receiving at webapi:</p> <blockquote> <p>"Method: POST,</p> <p><code>RequestUri: 'http://myhost/RestFulApi/api/webinfo'</code></p> <p>Content: System.Net.Http.StreamContent</p> <p>User-Agent: Chrome/27.0.1453.94</p> <p>Content-Length: 42226</p> <p>Content-Type: application/x-www-form-urlencoded; charset=UTF-8}</p> </blockquote> <p>I hope you could help me.</p> <p>Thanks</p>
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    1. USCarlos Landeras
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    1. COAnd what does canvas.toDataURL() return, are you sure it's not null? insert a console.log(canvasData) before your ajax-request, what's logged in the browser console?
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      1. USanderssonola
    2. COI think you may need to add `dataType: "json"` to your ajax call.
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      1. USjeffesp
    3. COI added dataType: "json" and It is still not working :(. @soderslatt yeah, I am debugging with chrome and it is not null. I can see the base64 string
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      1. USCarlos Landeras
 

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