How to access textbox values inside Gridview using Javascript code

Question

4.67/5 (2 votes)

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For an example I have 2 columns Country and States in gridview.
I am using the auto complete Ajax control to select value for country column’s text box in grid view.
I need the respective country’s selected value in state column’s text box.

I am not able to access the text box selected value through Java script.

XML

<script language="javascript" type="text/javascript">
    function ForStateValue(source, eventArgs)
{

  var ValueID = "<%= GridView1.TemplateControl.FindControl("txtState").ClientID %>";
    document.getElementById(ValueID).value = eventArgs.get_value();
    var textID = "<%= GridView1.TemplateControl.FindControl("txtCountry").ClientID %>";
    document.getElementById(textID).value = eventArgs.get_text();
}
</script>

XML

<asp:TemplateField HeaderText="Country">
<HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" Width="40px"></HeaderStyle>
<ItemStyle HorizontalAlign="Justify" VerticalAlign="Middle" />
<ItemTemplate>
<asp:TextBox ID="txtCountry" runat="server" ></asp:TextBox>
<ajaxToolkit:AutoCompleteExtender runat="server" ID="autoComplete1" TargetControlID="txtCountry"
ServicePath="AutoComplete.asmx" ServiceMethod="GetCountriesList" MinimumPrefixLength="1"
EnableCaching="true"  OnClientItemSelected="ForStateValue"/>
</ItemTemplate>
</asp:TemplateField>

Posted 10-Mar-11 20:13pm

prakash Punetha

Updated 10-Mar-11 21:20pm

Dalek Dave

v3

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Dalek Dave 11-Mar-11 3:20am

Edited for Readability.

1 solution

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strogg · Accepted Answer · 2011-03-10T22:03:00

You cannot use 'TemplateControl.FindControl()'
You'd rather be using GridView1.Rows[x].FindControl().
ASP.Net assigns a different id for text box in each row. You may have to loop thru each for its id.
You could do that on the server side with a loop.

But the only way to do it in javascript is to check the id of the textbox in the generated html & follow it
In your case the textboxes may be named like
GridView1_ctl02_txtState (for the first row) and it increments to ..ctl03.., ..ctl04.. & so on. The id will be different if you're keeping the gridview in another container.

Check the id & loop in javascript
Eg:

var i = 2;
var txt;
while(1)
{
 txt =document.getElementById('GridView1_ctl0' + i.toString() + '_txtState'); 
 if(txt!=null)
 {
   // process your textbox
 }
 else
 {
   break; // all rows completed
 }
}

And if the control id goes beyond ctl09, you must remove the '0' (must continue with ctl10 not ctl010). A little tweak required there.