Empty Field (Radio button) validation

[SreeVidya Balasubramanian]

I am using a set of radio buttons in my asp.net (using C#) application. On click of the submit button i need to confirm whether the radio buttons have been checked using javascript. i am trying to take the value using the following line of code.

if (document.getEl ementById("rbtn list_Q1").value == "")
{
alert("Please choose an option for Question no:1");
}


but the value remains undefined. How do i validate for unchecked radio buttons???

[vee10]

hi,

The below code may solve ur problem

if(document.get ElementById("rb tnlist_Q1").che cked==false)
alert("Please choose an option for Question no:1");

I am using a set of radio buttons in my asp.net (using C#) application. On click of the submit button i need to confirm whether the radio buttons have been checked using javascript. i am trying to take the value using the following line of code.

if (document.getEl ementById("rbtn list_Q1").value == "")
{
alert("Please choose an option for Question no:1");
}


but the value remains undefined. How do i validate for unchecked radio buttons???

[acoder]

To validate for radio buttons, you have to go through the array of radio buttons and check each one separately to see if it has been checked. See this link. That should solve your problem.

[gauravgmbhr]

To validate for radio buttons, you have to go through the array of radio buttons and check each one separately to see if it has been checked. See this link. That should solve your problem.

TRY the following code


m suppossing that ur form name is ="form"

function alert_empty_radio()
{
for(i=0;i<document.form.radios.length;i++)       

if(document.form.radios[i].checked==false)
{
flag=1;
}
else {
flag=0;
break;
}
}  //end loop



if(flag==1)
{
alert('ur custom message');
}
}//end function