how to check does the asp. net control element exist or not by using jquery?

Question

how to check does the asp. net control element exist or not? My page actually don't have the element with ID "hyper", but i just want to verify the existence of this.

im looking for the asp.net element with ID "hyper".

so what i have tried is

if (("#<%=hyper.ClientID %>").exists())

or

if (("#<%=hyper.ClientID %>").length>0)

but it give me this error

The name 'hyper' does not exist in the current context

<script type="text/javascript">
        function getElement() {
            if ($('#<%=(hyper.ClientID)%>').length > 0) {
                alert("none!");
            }
            else
                alert("exist!");

        }
</script>

<asp:HyperLink ID="hyper2" runat="server" NavigateUrl="www.facebook.com" >click me</asp:HyperLink>

Maybe just a typo, but your Hyperlink is hyper2 and your code is looking for hyper — Tim B James
– Tim B James, Commented Sep 6, 2011 at 9:22
i do it purposely. Supposingly it will alert "none" instead of "exist!". Right? — DEN
– DEN, Commented Sep 6, 2011 at 9:32
well no because your code is first trying to get the client id of a server control — Tim B James
– Tim B James, Commented Sep 6, 2011 at 9:45
you must specify hyper2.ClientID inside getElement() for it to work — Răzvan Flavius Panda
– Răzvan Flavius Panda, Commented Sep 6, 2011 at 11:20

Dease42 · Accepted Answer · 2011-10-27 20:28:35Z

1

The issue is that the element "hyper" doesn't exists, therefore ".ClientID" returns an error. You have to check for the element first:

(VB.Net)

<% If hyper IsNot Nothing Then %>
   ..: $("<%= hyper.ClientID %>").etc.
<% End If %>

(C#)

<% if(hyper != null) { %>
  ..: $("<%= hyper.ClientID %>").etc
<% } %>

I haven't tried the C# inside of an ASPX page, but the VB.Net works.

answered Oct 27, 2011 at 20:28

Dease42

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Comments

Jayantha Lal Sirisena · Accepted Answer · 2011-09-06 09:09:02Z

0

try using this,

 var Id= "<%=hyper.ClientID %>"
  $('#'+Id).exists()

answered Sep 6, 2011 at 9:09

Jayantha Lal Sirisena

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Comments

Tim B James · Accepted Answer · 2011-09-06 09:09:53Z

0

Try

if ($('#<%=(hyper.ClientID)%>').length > 0 ) {
     // exists
}

added in the $ to the code.

working example here http://jsfiddle.net/h3UUY/

answered Sep 6, 2011 at 9:09

Tim B James

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2 Comments

DEN Over a year ago

it give me the same result :(

Tim B James Over a year ago

what is hyper? could you post your html markup with the .net control?

Community · Accepted Answer · 2017-05-23 12:12:06Z

0

See this: What is best method to find a ASP.Net control using jQuery?

edited May 23, 2017 at 12:12

CommunityBot

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answered Sep 6, 2011 at 9:11

expertCode

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