how to get length of a form field using NAME

[jasonc]

For some reason this shows the error theValue is undefined

 

theValue = document.getElementsByName('customerName').value;
if (theValue.length > 0) {
// do something
}

[jasonc]

this is my code now, but i can not work out how to actually check that the field have data or not as all fields get a green tick placed even if it is empty.

 

function checkValidFormInput() {

					if (document.getElementsByName('customerName').value != '') {
					document.getElementById('customerNameImg').innerHTML = '<img alt="Valid" src="images/greenTick.png">';
					} else {
					document.getElementById('customerNameImg').innerHTML = '<img alt="Invalid" src="images/redX.png">';
					}

					if (document.getElementsByName('customerEmail').length > 0) {
					document.getElementById('customerEmailImg').innerHTML = '<img alt="Valid" src="images/greenTick.png">';
					} else {
					document.getElementById('customerEmailImg').innerHTML = '<img alt="Invalid" src="images/redX.png">';
					}

}

[sunfighter]

if you want to know how many use:

 

  var x=document.getElementsByName("customerName");
  alert(x.length);

 

If you want to know the value use:

  var x=document.getElementsByName("customerName");
  alert(x[0].value);