This is why JavaScript does my head in

[toastyman]

An incredibly simple problem:

function checkforstring(fieldname) {
	alert(fieldname);
	var formfieldvalue = document.getElementById(fieldname).value
	alert(formfieldvalue);
}

When running that, it alerts the value of the parameter passed to the function (the first alert), then Firefox returns the following error:

Error: document.getElementById(fieldname) has no properties
Source File: http://localhost:8084/shop/index.php?edit
Line: 15

Could someone with a bit JavaScript brain help me out on this one.

Cheers,
Rich

 

[GravyMonster]

to get the value property of a form field you need to use getElementsByName(fieldname)

PITA, yes, but it works.

 

[toastyman]

to get the value property of a form field you need to use getElementsByName(fieldname)

PITA, yes, but it works.

It's a start! Trust me to get the function name wrong

A bit of modifying and I have the following working code:

function checkforstring(fieldname) {
	alert(fieldname);
	formfieldvalue = document.getElementsByName(fieldname)[0];
	alert(formfieldvalue.value);
}

Thanks very much