JavaScript forEach loop works in all webbrowser but Internet Explorer

Question

I've managed to get the loop working in all browsers apart from Internet Explorer (which doesn't seem to support forEach).

The JavaScript cpde:

function validate() {
    var msg = '';
    var i = 0;

    arr.forEach(
        function validateinfo(){
            if (getRBtnName('yesNo_' + i + '_0' == "" && 'yesNo_' + i + '_0') == "") {
                msg = 'Please select yes/no for all users'
            }
            if (msg == '') {
                return true;
            }
            is++;
        }
    )

    if (msg == '') {
        reloadpage();
    }

    if (msg != '') {
        alert(msg);
        return false;
    }
}


function reloadpage(){
    window.location.reload()
}

The array is being set in the PHP file rather than passed in. It's being set using:

<script type="text/javascript">
    var arr = <?php echo json_encode($arr) ?>;
</script>

Have a look here http://stackoverflow.com/questions/9329446/for-each-in-an-array-how-to-do-that-in-javascript — Pedro Monte, Jul 23 '13 at 10:10
[Array.forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach) — Andreas, Jul 23 '13 at 10:10
Just noticed the increment says is++ in the code above, but the actual code does say i++ in the script. — user2610063, Jul 23 '13 at 10:20
What version of IE are you working with? Note that `Array.forEach` was only added in IE9; earlier versions do not support it. (but there are other ways of looping through an array, so it's no big deal) — Spudley, Jul 23 '13 at 10:33
+1 to @Pedro3M : although I'd add to look at the highest-rated answer, not the accepted answer: — founddrama, Jul 23 '13 at 10:44

score 5 · Answer 1 · answered Jul 23 '13 at 10:09

5

Just place this shim from MDN at the beginning of your scripts:

if ( !Array.prototype.forEach ) {
  Array.prototype.forEach = function(fn, scope) {
    for(var i = 0, len = this.length; i < len; ++i) {
      fn.call(scope, this[i], i, this);
    }
  }
}

answered Jul 23 '13 at 10:09

VisioN

143,310
32
282
281

@founddrama What? `oO` FYI there is no difference if it is `++i` or `i++` in the last section of `for`, since this code is executed separately after last line in the `for` block. – VisioN Jul 23 '13 at 10:47
Thanks for the help everyone. I managed to get it working :) Had to change it quite a bit, but the links and advise provided pointed me in the right direction. Thanks again – user2610063 Jul 23 '13 at 18:24
@user2610063 If the answer helped you, you may accept it by clicking tick on the left. – VisioN Jul 23 '13 at 19:49

JavaScript forEach loop works in all webbrowser but Internet Explorer

1 Answers1