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Editorial Team
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Asked: 2026-05-19T09:23:25+00:00

I have a jQuery.ajax call on a button click event in my webpage. This

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I have a jQuery.ajax call on a button click event in my webpage. This ajax call sends quite a lot of markup back to the server. After some processing the server posts back a small URL address. This works fine sometimes but other times doesn’t. I have a breakpoint just before the ajax call and also have some in my WebMethod. It appears that sometimes the WebMethod doesn’t even get hit.

What could be causing the .ajax call to fail? I’m assuming there must be something in the parameters I am sending. But I am escapeing the markup.

Anyone got any ideas?

$.ajax({
    type: 'POST',
    url: 'WebServices.asmx/GetBitmapPathForVML',
    contentType: 'application/json; charset=utf-8',
    data: '{"sVML" : "' + escape($('#divChart')[0].innerHTML) + 
      '","width" : 800,"height": 600}',
    dataType: 'json',
    success: function(result) {
            var newWindow = window.open ("", "Chart","");
            //blah blah
            newWindow.document.write("<BODY>");
            newWindow.document.write(
              '<img src="file" alt="Chart"></img>'.replace('file',result.d)
            );  
            newWindow.document.write("</BODY>");    
            //blah blah
    }
});
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1 Answer

  1. Editorial Team

    Don’t like answering my own question (not that I am, really). But the issue was to do with the maximum JSON length property.

    I found the answer here

    ..and added this to my webconfig…

    <system.web.extensions>
    <scripting>
        <webServices>
            <jsonSerialization maxJsonLength="2097152"/>
        </webServices>
    </scripting>
</system.web.extensions>

    Thanks for all the answers guys, especially those about catching the errors.

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