Use a variable derived from Javascript into an ASP tag

Question

I'm having difficulty in using a variable derived from Javascript into an ASP tag .

<script language="javascript"> 
    if (arg) 
    {
        var text_box_to_fill = arg.sendValue_Code;                  
        document.getElementById( document.getElementById("<%= "+text_box_to_fill+".clientID %>").value = selected_libelle_value;
    }
</script>

Any suggestions?

You can only render something on the server into the client, but can't go in the reverse. — Brian Mains
– Brian Mains, Commented Feb 25, 2013 at 19:07

Brian Mains · Accepted Answer · 2013-02-25 19:41:10Z

1

Not sure why there are duplicate "document.getElementById" code references, but you can only go from server to client in this fashion. So it would be:

<script language="javascript"> 
    if (arg) 
    {
        var text_box_to_fill = arg.sendValue_Code;                  
        document.getElementById("<%= text_box_to_fill.ClientID %>").value = selected_libelle_value;
    }
</script>

EDIT: Note that you have to have the script in the same page or control as the origin of "text_box_to_fill". If you have this script in a page, and the textbox is in the user control, that won't work.

edited Feb 25, 2013 at 19:41

answered Feb 25, 2013 at 19:08

Brian Mains

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5 Comments

user1560736 Over a year ago

Compiler Error Message: BC30451: Name 'text_box_to_fill' is not declared.

user1560736 Over a year ago

this is the message my compiler is sending back to me

Brian Mains Over a year ago

You have to use the server-side control's ID. What is the ID of the textbox? Also edited response above.

user1560736 Over a year ago

I finally found a way. This is the ID of the textbox that I have in "var text_box_to_fill" so I use it directly in javascript like this :document.getElementById(text_box_to_fill).value = selected_libelle_value; and it Works. thank for your help

user1560736 Over a year ago

I was obsessed by using server tag ! now it's Ok. Smile.

Andy Magee · Accepted Answer · 2013-02-25 19:11:26Z

0

text_box_to_fill is defined client side in the browser, whereas the <% %> tags are evaluated on the server. It's not possible to reference javascript variables from the server code.

answered Feb 25, 2013 at 19:11

Andy Magee

2363 silver badges10 bronze badges

1 Comment

user1560736 Over a year ago

I've noticed that @andy Magee ! but are not there any others ways to fix it ?

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