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DataTable: Change the class for a column conditionally

Posted on 2016-09-13
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Last Modified: 2016-09-19
I have a Datatable with the following column:

{ title: "Status", data: "StatusName", class: "centered-text" }


I need to change the font color conditionally.  I created classes for each condition.  How could I change the class based on the data?  

Thank You,
Crystal
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Question by:Crystal Rouse
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Accepted Solution

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zephyr_hex (Megan) earned 500 total points
ID: 41796317
By DataTable, I assume you mean in C# ?

One way to do this would be to select the rows in the DataTable that meet you condition, and modify the class.

//find the rows that meet your condition
DataRow[] rows = myDataTable.Select("title Like 'A%'");

//loop over those rows and add a new class
//note:  myDataTable is updated by this as well
for(int i = 0; i < rows.Length; i ++)
{
      rows[i]["class"] = rows[i]["class"] + " myNewClass";
}

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Author Comment

by:Crystal Rouse
ID: 41796343
I'm using JavaScript and C#.  Trying to create a function to change the class based on the data.
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LVL 42

Expert Comment

by:zephyr_hex (Megan)
ID: 41796376
ok, the code I gave you above is C#

If you want to change the class in JavaScript, then you actually would be modifying an HTML table (client side structure) and not a DataTable (server side stucture) because JavaScript is a client side language.
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Author Comment

by:Crystal Rouse
ID: 41797899
I need to write a JavaScript function that I can call when the page loads to change the font of a column based on the data.  I can figure out most of this, just don't know how to find the column. I can get the entire table's class to change, just not the individual column.
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LVL 42

Assisted Solution

by:zephyr_hex (Megan)
zephyr_hex (Megan) earned 500 total points
ID: 41798131
Here is a Fiddle Demo.

Given the following HTML:

<table id="myTable">
  <thead>
    <tr>
      <th>Col 1</th>
      <th>Col 2</th>
      <th>Col 3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>a</td>
      <td>b</td>
      <td>c</td>
    </tr>
    <tr>
      <td>d</td>
      <td>e</td>
      <td>f</td>
    </tr>
    <tr>
      <td>g</td>
      <td>h</td>
      <td>i</td>
    </tr>
  </tbody>
</table>
<input type="text" id="myTxt" placeholder="input column number">
<input type="button" id="myBtn" value="Do It">
<span id="mySpan"></span>

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CSS:
.red {
  background-color: red;
}

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You can access the column values and modify the CSS from jQuery:
$('#myBtn').click(function() {
  $("#mySpan").text("");
  $("#myDiv").remove();
  var colNum = $("#myTxt").val();
  if ($("#myTxt") === "") return;

  var col = $('#myTable tr > td:nth-child(' + colNum + '), table tr > th:nth-child(' + colNum + ')');

  col.addClass("red");
  $("#mySpan").before("<div id='myDiv'>Values from column:</div>");
  var span = "";
  col.each(function() {
    span = span + $(this).text() + " ";

  });
  $("#mySpan").text(span);
});

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