javascript on content page

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i wanna to access value of box5(TextBox) in bottom code and modify its text in javascript attached file.
but i cant do it.i cant access value of box5.how i can??
thank ur help.

ASP.NET

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server" >
        <asp:TextBox id="box5" runat="server">

Posted 30-Aug-12 3:51am

r.kh

Updated 30-Aug-12 10:59am

RaisKazi

v2

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Dasaradhi_r 30-Aug-12 10:00am

How did you attach the script file? If attached properly, there should not be any issues doing it.

2 solutions

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Sandip.Nascar · Accepted Answer · 2012-08-30T04:03:00

Solution 2

You are accessing the server control in javascript.
So, you need to identify the textbox through ClientID as the id is changed after it renders in plain html.

document.getElementById("<%= box5.ClientID %>").value

Hope this helps.
cheers

Posted 30-Aug-12 4:03am

Sandip.Nascar

Comments

r.kh 30-Aug-12 10:42am

i wrote alert(document.getElementById("<%= box5.ClientID %>").value); but dosent show any alert

r.kh 30-Aug-12 10:45am

and i wrote alert(document.getElementById("<%= box5.ClientID %>")); so alert is showed and its text was 'null'

Sandip.Nascar 30-Aug-12 11:02am

Do one thing. After you run the page, view the source and see what you see the text id? Let us know.

Manfred Rudolf Bihy · Accepted Answer · 2012-08-30T04:08:00

Solution 3

Since the JavaScript is kept in a separate file, you'll have to pass the <%= box5.ClientId%> to the function when you are calling it. The attribute ID of a runat="Server" control can only be used from Code-Behind.

Regards,

— Manfred

Posted 30-Aug-12 4:08am

Manfred Rudolf Bihy

Comments

r.kh 30-Aug-12 10:43am

i wrote alert('<%=box5.ClientID %>'.value.toUpperCase()); but dosent show any alert

Manfred Rudolf Bihy 30-Aug-12 10:47am

Depends on where exactly you wrote that. Please add some code to your question by using the improve question link below your question. If you added that line to your Javascript file it wouldn't work, because the JavaScript file is not processed on the server side.

Manfred Rudolf Bihy 30-Aug-12 10:51am

Just try alert("<%= box5.ClientID %>") or alert('<%= box5.ClientID %>').