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Tip of the Day
Language: JavaScript
Expertise: Beginner
Oct 19, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Form Validation

Question:
I need to perform a validation on five fields in a form. The logic is:

If field1 length >0 then disallow form submission if field2, field3, field4, and field5 are all empty. However, if any one of the fields (2-5) contain info, then submit the form.

I have tried many variations of the following code, but it still forces me to enter something in all the fields (2-5).

if ((document.addorupdate.field1.value.length >1) && 
((document.addorupdate.field2.value == "")| | 
(document.addorupdate.field3.value == "")| |
(document.addorupdate.field4.value == "")| |
(document.addorupdate.field5.value == ""))){
alert("Sorry, you must update one of the empty fields.");
return false;
}
else {return true ;}

Answer:
Try this instead:

myForm = document.addorupdate
filledOut = false

if (myForm.field1.value != "") {
	if (myForm.field2.value != "") filledOut = true
	if (myForm.field3.value != "") filledOut = true
	if (myForm.field4.value != "") filledOut = true
	if (myForm.field5.value != "") filledOut = true
}

if !(filledOut)
	alert("Sorry, you must update one of the empty fields.")

return filledOut
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