this link has validation function for radio
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<cfinput type="Radio"....
okay i have the following question with four choices:
****************
Choose one of the following: <br />
<cfinput type="Radio" name="at" value="A"><font face="arial" size="2">choice A</font><br />
<cfinput type="Radio" name="at" value="B"><font face="arial" size="2">choice B</font><br />
<cfinput type="Radio" name="at" value="C"><font face="arial" size="2">choice C</font><br />
<cfinput type="Radio" name="at" value="D"><font face="arial" size="2">choice D</font><br />
***************
how do i make it so that the question requires one of the radio buttons to be selected?
and also how do i make one choice "pre-selected".
it seems that if i put a "required" attribute in each <cfinput.. then each one will have to be selected.
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Answers
very simple article about "How to "
http://members.blue.net.au
so it will be like that
<HTML>
<HEAD>
<TITLE>TEST</TITLE>
<SCRIPT language = JavaScript>
<!--
function valbutton(thisform) {
// place any other field validations that you require here
// validate rb_at
myOption = -1;
for (i=0; i<thisform.rb_at.length; i++) {
if (thisform.rb_at[i].checked
myOption = i;
}
}
if (myOption == -1) {
alert("You must select a radio button");
return false;
}
// display the number of the button selected
else {
alert("You selected button number " + myOption
+ " which has a value of "
+ thisform.rb_at[myOption].v
return true;
}
// place any other field validations that you require here
}
//-->
</SCRIPT>
</HEAD>
<body>
<form name="myform" onsubmit="valbutton(this)"
Choose one of the following: <br />
<input type="Radio" name="rb_at" value="A"><font face="arial" size="2">choice A</font><br />
<input type="Radio" name="rb_at" value="B"><font face="arial" size="2">choice B</font><br />
<input type="Radio" name="rb_at" value="C"><font face="arial" size="2">choice C</font><br />
<input type="Radio" name="rb_at" value="D"><font face="arial" size="2">choice D</font><br />
<input type="submit" name="" value="Validate" />
<input type="reset" name="reset" value="Clear" />
</form>
</body>
</html>
You can use this function to check if any type of input has a value:
function hasValue(inputObj)
{
obj_type = inputObj.type.toUpperCase(
if (obj_type == "TEXT" || obj_type == "PASSWORD")
{ return (inputObj.value.length != 0); }
else if (obj_type == "SELECT-ONE")
{ return (inputObj.selectedIndex > 0); }
else if (obj_type == "SELECT-MULTIPLE")
{
for (var optionIndex=0; optionIndex < inputObj.length; optionIndex++)
if (inputObj.options[optionIn
{ return true; }
return false;
}
else if (obj_type == "RADIO" || obj_type == "CHECKBOX")
{
if (inputObj.length)
{
for (var optionIndex=0; optionIndex < inputObj.length; optionIndex++)
if (inputObj[optionIndex].che
{ return true; }
return false;
}
else { return inputObj.checked; }
}
}
In your JavaScript, you can do this:
<form name="testForm" onsubmit="return validateForm">
Choose one of the following: <br />
<cfinput type="Radio" name="at" value="A" checked="true"><font face="arial" size="2">choice A</font><br />
<cfinput type="Radio" name="at" value="B"><font face="arial" size="2">choice B</font><br />
<cfinput type="Radio" name="at" value="C"><font face="arial" size="2">choice C</font><br />
<cfinput type="Radio" name="at" value="D"><font face="arial" size="2">choice D</font><br />
</form>
function validateForm()
{
if (!hasValue(at))
{
alert("You must select a radio value");
return false;
}
return true;
}
**************************
**************************
TO set one checkd by default, simply add the attribute checked="true" like I did above for the first option.
Hi, u wont need javascript if u use this !
pls chk the output of the following on the browser !
Choose one of the following: <br />
<cfform NAME="x" ACTION="akp.cfm">
<cfinput type="Radio" name="at" value="A" CHECKED><font face="arial" size="2">choice A</font><br/>
<cfinput type="Radio" name="at" value="B"><font face="arial" size="2">choice B</font><br/>
<cfinput type="Radio" name="at" value="C"><font face="arial" size="2">choice C</font><br/>
<cfinput type="Radio" name="at" value="D"><font face="arial" size="2">choice D</font><br/>
</CFFORM>
PS : no javascript required Since one is bydefault selected
& use will only be able to select
only one of them as they all have the same name !
K'Rgds
Anand
anandkp is correct. There really isn't much need for the JavaScript to validate that they selected a radio option if you have one set selected by default. The reason is that there is no way to de-select a radio option, so once one is selected, you can only change which option you have selected. So in setting a default selected option, the user will be gauranteed to have a radio option selected.
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by: HamdyHassanPosted on 2003-04-14 at 07:55:04ID: 8327117
you need javascript