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Editorial Team
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Asked: 2026-05-12T11:48:28+00:00

I am trying to check all the checkboxes on a webform (aspx) page, which

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I am trying to check all the checkboxes on a webform (aspx) page, which is inside a master page, depending on the ID of the checkbox. The checkboxes are created dynamically, so I only know the prefix for finding it. So, I need to find these checkboxes by iterating the controls on the page somehow.

Here is the code behind where the checking should occur:

Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LinkButton1.Click
    Dim oCheckbox As System.Web.UI.WebControls.CheckBox = Nothing
    Dim oControl As Control = Nothing
    For Each oControl In Me.Controls
        If oControl IsNot Nothing Then
            If TypeOf oControl Is System.Web.UI.WebControls.CheckBox Then
                oCheckbox = oControl
                If oCheckbox.Text.StartsWith("ClientCheckBox_") Then
                    oCheckbox.Checked = True
                End If
            End If
        End If
    Next
End Sub
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1 Answer

  1. Editorial Team

    Here is a non-jQuery example of how to do this client side.
    Let me know if you need any more help putting this example into practice.

    <html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <script type="text/javascript" src="jquery-1.3.2-vsdoc2.js"></script>


    <script type="text/javascript">

        function selectDeselect(button) {
            var checked = (button.value === 'Select All');
            var checkboxes = document.getElementsByName('myCheckBoxGroup');                     
            for (var i = 0; i <  checkboxes.length; i++) {
                checkboxes[i].checked = checked;
            }

            button.value = (checked) ? 'Deselect All' : 'Select All';           
        }

    </script>

    <style type="text/css">

    </style>
</head>
<body>

    <input type="button" value="Select All" onclick="selectDeselect(this);" />

    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />
    <input type="checkbox" name="myCheckBoxGroup" />

</body>
</html>
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