IE11 is throwing a Java script error, while everything seems to be functioning fine in IE9

if ((document.getElementById('position').value != '01') && (document.getElementById('position').value != '04') && (document.getElementById('CkbxSecondment').checked)) {
  alert('The position of the employee is not at the Partner level. Only Active Partners can go on secondment.');

  divElement.style.display = 'none'; // hides
  document.getElementById('CkbxSecondment').checked = false;
}

Error occurs at:

((document.getElementById('position').value != '01') cannot read property 'value' of null)
javascript

Answer №1

Internet Explorer has an issue with its implementation of getElementById(id) (which is only fixed when running in standards mode).

In IE, getElementById(id) may return an element with a matching name attribute even though it is not a valid match (if not running in standards mode).

This means that if you are testing in different browsers and one is using a different rendering mode, you might see inconsistent results.

If you are unsure whether there will be a match, always test for the element first.

var rankField = document.getElementById('rank');
if(rankField && rankField.value != '01'){
  //...
}

Answer №2

It is recommended to validate the elements before attempting to access their properties:

if (document.getElementById('rank') && document.getElementById('CkbxSecondeePartner')) {
  if ((document.getElementById('rank').value != '01') && (document.getElementById('rank').value != '04') && (document.getElementById('CkbxSecondeePartner').checked)) {
    alert('The employee's rank is not at the Partner level. Only Active Partners can be on secondment');

    divObj.style.display = 'none'; //hide
    document.getElementById('CkbxSecondeePartner').checked = false;
  }
}

Answer №3

It's disappointing that nobody seems to be addressing the compatibility issue with IE11. The script works perfectly fine on IE 8 or 9, but not on IE11. Many legacy applications relying heavily on JavaScript are facing difficulties.

Instead of (document.getElementById('rank').value != '01')

Try using (document.getElementById('rank') != '01')

This simple change should resolve the issue.

The main problem lies in the fact that implementing this change across a system with 3 million lines of code is extremely challenging, if not impossible.

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