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Get response from aspx page in json format instead of plain html

I want to make an ajax call to the server. I need to get the html of a page like foo.aspx: Foo.aspx html:

<form>
<div>foo</div>
</form>

I am calling this page from a remote page, for example:

         $.ajax({
             url: '/foo.aspx',
             data: {},
             contentType: 'application/json; charset=utf-8',
             dataType: 'json',
             success: function (response) {

             }
         });

I need the html of this page, but my requirement is that the response from this page must be in JSON format. i.e.

{"myresponse": {
  "id": "123",
  "html":<HTML of foo.aspx>,

}}

I need html as a json property because I need to set other properties as well from the foo.aspx code? How can I get the response in the aspx page in json format instead of plain html? What is the other approach for getting the HTML of the remote page + other properties in json format from the server? Should I go for HTTPHandlers? If so, how can I get the html foo.aspx in this HTTPHandler?

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4 answers


You can try overriding how your page is rendered:

    protected override void Render(HtmlTextWriter writer)
    {
        var sw = new System.IO.StringWriter();
        var tw = new HtmlTextWriter(sw);
        base.Render(tw);

        Response.Write(String.Format("{{\"myresponse\": {{  \"id": \"123",\"html\":\"{0}\"}}}}"
        , Server.HtmlEncode(sw.ToString()).Replace("\n"," "));
        Response.Flush();
        Response.End();
    }


Sorry for any syntax error and basic handling of carriage returns. I think it would be better to buffer the output during page_load (Response.BufferOutput = true)

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If you need HTML, change the data type to html. The success event will then return html as a response.

Something like:



$.ajax({
     url: '/foo.aspx',
     dataType: 'html',
     success: function (data, textStatus, jqXHR) {
            alert(data); //data is html. 
     }
 });​
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Basically, you need to create an HTTPHandler that wraps up the output of Foo.aspx to your JSON evenlope. HAve said the JS call would be to url / MyWebHandler? Page = foo.aspx instead of just /foo.aspx. Inside the handler, all you need to do is simply request your page and dump its output.

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I modified jbl's example of overriding the Render method a bit, it worked great for me. I don't need HTML coding, just need to apply some formatting and include content type

            protected override void Render(HtmlTextWriter writer)
            {
                var sw = new System.IO.StringWriter();
                var tw = new HtmlTextWriter(sw);
                base.Render(tw);

                var html = sw.ToString();            
                html = html.Replace("\n", " ");
                html = html.Replace("\r", " ");
                html = html.Replace("\t", " ");
                var data = html.Replace("\"", "\\\"");
                data = data.Replace("/", "\\/");
                var json = String.Format("{{\"html\":\"{0}\"}}", data);

                Response.ContentType = "application/json";
                Response.Write(json);
                Response.Flush();
                Response.End();
            }
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