Accessing HTML Checkbox in code behind

Question

I have a HTML checkbox which will perform a simple validation on another textbox, so the textbox will only be enabled if the checkbox is checked, but I also want to access this checkbox control in code behind to check and uncheck it. I don't think I can use the runat="server" because on the onClick event which will cause ('<%=uitxtVouTypeRedeemValue.ClientID%>') to be output as plain text. Please advice. Thanks.

<input type="checkbox" 
 onclick="document.getElementById('<%=uitxtVouTypeRedeemValue.ClientID%>').disabled =(this.checked)?0:1" id="uichkVouTypeRedeemable" />

competent_tech · Accepted Answer · 2011-11-07 04:45:44Z

1

In order to access it from code-behind, you must have runat="server" specified.

To resolve your issue with the onclick event, you can add the following code in your code-behind during the control or page's Load event:

uichkVouTypeRedeemable.Attributes.Add("onclick", "document.getElementById('" & uitxtVouTypeRedeemValue.ClientID & "').disabled =(this.checked)?0:1;")

edited Nov 7, 2011 at 4:45

answered Nov 6, 2011 at 19:58

competent_tech

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k80sg Over a year ago

Thanks! A minor correction for others looking at this: ('" & uitxtVouTypeRedeemValue.ClientID & "') should have ' '

Community · Accepted Answer · 2017-05-23 12:29:12Z

0

You can access the Form data in code behind. See the following Stack Overflow thread :

How to access html form input from asp.net code behind

Essentially, the checkbox checked status will be posted, once the form is submitted. You can then access this information, in the code-behind.

edited May 23, 2017 at 12:29

CommunityBot

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answered Nov 6, 2011 at 8:27

Pawan Mishra

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k80sg Over a year ago

Hi, besides getting the value, how can I check and uncheck it from code behind?

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