Set checked attribute in Web Forms

Question

I try to set checked attribute for <input type="checkbox"/>:

checked="<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "IsOperationPerformed")) ? "checked" : string.Empty%>"

But I get an error

Argument type ‘string’ is not assignable to parameter type ‘bool’

IsOperationPerformed of type Boolean.

How can I add cheched attribute?

What do you mean you got an error "IsOperationPerformed of type Boolean."? What is the exact error message you got. — Ben Robinson, Nov 28 '14 at 13:06
Can you try wrapping single quotes around attribute, as you can see that quotes here are not escaped properly. — Arindam Nayak, Nov 28 '14 at 13:07
@BenRobinson, no. I said that IsOperationPerformed has type bool, whereas i get error in such convert — demo, Nov 28 '14 at 13:08
@BenRobinson, "Argument type ‘string’ is not assignable to parameter type ‘bool’" — demo, Nov 28 '14 at 13:10
@ArindamNayak, you were right. i didn't get value from database — demo, Nov 28 '14 at 13:25

score 0 · Accepted Answer · edited Nov 28 '14 at 13:36

0

As per my knowledge, CheckBox should be equal to either true or false and not checked or empty. Try changing it and revert if problem still occurs. Hope i helped.

checked="<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "IsOperationPerformed")) ? TRUE : FALSE%>"

edited Nov 28 '14 at 13:36

Arindam Nayak

answered Nov 28 '14 at 13:17

ALOK

this helps, thanks. However i always think that chechbox can be checked or cheched="checked" – demo Nov 28 '14 at 13:25
But as OP has said , it was showing some error, it has to do with some code. But `checked=checked` also works.- http://www.w3schools.com/tags/att_input_checked.asp - http://stackoverflow.com/questions/7851868/whats-the-proper-value-for-a-checked-attribute-of-an-html-checkbox – Arindam Nayak Nov 28 '14 at 13:27
@Alok, you havn't solved OP's original problem , and checked with any value will always work - http://stackoverflow.com/questions/7851868/whats-the-proper-value-for-a-checked-attribute-of-an-html-checkbox – Arindam Nayak Nov 28 '14 at 13:29
@ArindamNayak thats html and i dont know it works with asp.net or not but correct way is it should be true or false. http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkbox.checked(v=vs.110).aspx – ALOK Nov 28 '14 at 13:32
1

I will surely try and find out whether checked="checked" works or not but the code was wrong as string.empty will return empty to check...And yes only checked works to set default to check. – ALOK Nov 28 '14 at 13:34

1 Answers1