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POHow to create DataTable filled by JSON when number of columns is unknown
 

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  1. POHow to create DataTable filled by JSON when number of columns is unknown
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    <p>I have a table in my web-application, which is created like this:</p> <pre><code>&lt;table id="mygrid"&gt; &lt;thead&gt; &lt;th&gt;Col1&lt;/th&gt; &lt;th&gt;Col2&lt;/th&gt; &lt;th&gt;Col3&lt;/th&gt; &lt;/thead&gt; &lt;/table&gt; &lt;script type="text/javascript"&gt; $(document).ready(function() { window.oTable = $("#mygrid").dataTable({ "bServerSide": true, "bSort": false, "sAjaxSource": "@Url.Action("MyFunction", "Events")", "fnServerParams": function(aoData) { aoData.push({ name: "arg1", value: "@Model.arg1" }); }, "aoColumns": [ { "mDataProp": "Column1" }, { "mDataProp": "Column2" }, { "mDataProp": "Column3" } ], "bJQueryUI": true, "sPaginationType": "full_numbers", "bProcessing": false }); </code></pre> <p>I fill it with function that returns JSON result, like this:</p> <pre><code>ActionResult MyFunction(string arg1, ...) { List&lt;string&gt; someList = ...; object array = eventsList.Select(str =&gt; new { Column1 = str + "1", Column2 = str + "2", Column3 = str + "3" }); var result = new { sEcho = ..., iTotalRecords = ..., iTotalDisplayRecords = ..., aaData = array }; return Json(result, JsonRequestBehavior.AllowGet); } </code></pre> <p>Now I want to generate table dynamically, so I don't know the number of columns in design time. For example:</p> <pre><code>&lt;table id="mygrid"&gt;&lt;thead&gt; @{ foreach (string col in colNames) &lt;th&gt;@col&lt;/th&gt; } &lt;/thead&gt;&lt;/table&gt; </code></pre> <p>Could you please advise how should I change my Javascript and C# code to fill the table in similar way? Is it possible? I can generate <code>"mDataProp"</code> lines in Javascript code like I generate columns, but how can I create JSON result in C# code?</p> <p><strong>Added:</strong></p> <p>I have solved the problem with controller. As I discovered, the List of Dictionaries is serialized to exactly the same JSON as the list of anonymous objects, so I wrote this:</p> <pre><code>for (int i = 0; i &lt; n; ++i) { list.Add(new Dictionary&lt;string, string&gt;()); foreach (int colName in colNames) events[i][colName] = cellValue; } var result = new { ..., aaData = list }; return Json(result, JsonRequestBehavior.AllowGet); </code></pre> <p>Now I have new question. I cannot generate "aoColumns" array using C# loop like I generated tags in HTML code. I tried like this:</p> <pre><code>"aoColumns": [ @{ for (int i = 0; i &lt; n; ++i) { string colName = "Column" + i.ToString(); { "mDataProp": "@colName" }, } } ], </code></pre> <p>but it does not work. How can I do it?</p>
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    1. USAlexey Petrenko
    1. USAlexey Petrenko
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      1. POHow to create DataTable filled by JSON when number of columns is unknown
      1. USAlexey Petrenko
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      1. VTUpMod
    1. COso your have json string contains the rows of your data but you don't know how many columns for each row, am i correct??
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      1. POHow to create DataTable filled by JSON when number of columns is unknown
      1. USebram khalil
    2. COI mean identifiers in following lines: Column1 = str + "1", Column2 = str + "2"... matches to strings in JS code ( { "mDataProp": "Column1" } ...). I can generate n JS lines for n columns like this: @{for (int i = 0; i < 10; ++i) {"mDataProp" : "Column" + @i } }. But I can't "generate" the C# code in similar way.
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      1. POHow to create DataTable filled by JSON when number of columns is unknown
      1. USAlexey Petrenko
 

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