How to get hidden field value on page load in asp.net?

Question

<script type="text/javascript">     
    var BrowserCompt = document.documentMode;
    document.getElementById("<%=hddnBrowserComp.ClientID %>").value = BrowserCompt;
    alert(BrowserCompt);
</script>

I want to use this hiddenfield(hddnBrowserComp) value on my page load , but it is coming blank. How can i achieve the same?

C#
if(!IsPostBack)
{
string x ="";
x = hddnBrowserComp.Value.ToString();
}

You won't be able to do what you're trying to do using the code above as JavaScript executes on the client and your C# code executes on the server. Because of server --send to--> client, your C# code is executed first (and has no awareness that on the client side you're setting that hidden field value, unless you post back) and the hidden field is blank. Based on what you're trying to do with document.documentMode, [this](http://stackoverflow.com/questions/9430449/can-i-detect-ie-document-mode-on-the-server-side-using-the-httpbrowsercapabiliti) previous question may help you.... — nkvu, Mar 30 '13 at 05:49

score 2 · Accepted Answer · answered Mar 30 '13 at 09:16

2

It is never going to work that way, as server side code executes first then client side code.

answered Mar 30 '13 at 09:16

Nilesh Thakkar

2,877
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score 0 · Answer 2 · answered Mar 30 '13 at 05:52

0

Remove !IsPostBack

You have !IsPostBack. So You got this problem. 1st remove that then try .

string x ="";
x = hddnBrowserComp.Value.ToString();

answered Mar 30 '13 at 05:52

Ramesh Rajendran

37,412
45
153
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score 0 · Answer 3 · answered Mar 30 '13 at 06:11

documentMode property only supported in the IE...documentMode property it returns the following value based on the IE versions

5

Internet Explorer 5 mode (also known as "quirks mode").

7

Internet Explorer 7 Standards mode.

8

Internet Explorer 8 Standards mode.

9

Internet Explorer 9 Standards mode.

10

Internet Explorer 10 Standards mode.

score 0 · Answer 4 · answered Mar 30 '13 at 09:55

0

if(!isPostback)    
{        
  string x ="";
  x = hddnBrowserComp.Value.ToString();

  ScriptManager.RegisterClientScriptBlock(this, GetType(), "Done", "alert('" + x+"');", true);

}

try this it will work

answered Mar 30 '13 at 09:55

Aijaz Chauhan

1,511
3
25
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How to get hidden field value on page load in asp.net?

4 Answers4