<asp.HiddenField> value coming as empty in codebehind even after value is set in javascript
Question
Here's my problem. I have a hidden field whose value I change through a javascript method. The value of hiddenfield is set whenever a row is selected in a gridview with ctrl key pressed.
This is how value for hidden field is assigned (Javascript Code):
var curKey;
function checkKey()
{
//Check if contrl key is pressed or not.
if (curKey == 17)
{
document.getElementById('<%= CtrlKeyPressed.ClientID %>').value = 'Y';
}
}
In the code, I have called this javasxcript inside gridview_rowdatabound function which would be like given below :
gridview.Rows[i].Attributes.Add("onclick",ClientScript.GetPostBackEventReference(grvKanban, "Select$" + i) + ";checkKey()");
In the body of .aspx page, code is something like this (if control key is pressed while clicking any row in gridview, the value of curKey will be 17):
<body onkeyup = "curKey = null;" onkeydown = "curKey=event.keyCode;">
For the hidden field, Code is :
<asp:HiddenField ID="CtrlKeyPressed" runat="server"/>
Basically I want to know whether Ctrl Key is pressed while selecting the gridview row, which I thought of finding with value of Hidden field. But in code behind, when I try to get the value of CtrlKeyPressed.Value is coming as empty string.
Can anyone please help to solve this issue?
Thanks!!!
1 answers
solution1
1 ACCPTED 2013-12-16 13:22:22
You need to run checkKey() before the post back. So change this:
gridview.Rows[i].Attributes.Add("onclick",
ClientScript.GetPostBackEventReference(grvKanban, "Select$" + i) +
";checkKey()");
to this:
gridview.Rows[i].Attributes.Add("onclick",
"checkKey();" +
ClientScript.GetPostBackEventReference(grvKanban, "Select$" + i));
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