Code is not working in IE9

Question

Possible Duplicate:
IE9 array does not support indexOf

My Code:

var arrFruits = ['apple', 'banana', 'carrot', 'dates'];
var position = arrFruits.indexOf( 'carrot' );
position > -1 && arrFruits.splice( position, 1 );
alert( arrFruits );

The above code is displaying the result as apple, banana, dates in Chrome. But it is not working in IE9.

What does "not working" mean? It triggers a syntax error? It alerts undefined? It makes the computer explode? — Álvaro González, Dec 11 '12 at 08:25
Works fine in my IE9, but array indexOf probably does'nt work in IE8- [**FIDDLE**](http://jsfiddle.net/rnnS8/) — adeneo, Dec 11 '12 at 08:26
is this the error that you're getting? "Object doesn't support property or method 'indexOf'" — artsylar, Dec 11 '12 at 08:27
I think this question is similar to this one http://stackoverflow.com/questions/10923434/ie-indexof-results-in-object-doesnt-support-this-property-or-method — artsylar, Dec 11 '12 at 08:29
No message is shown. `Alert` message is not popped up in `IE9` but popped up in `Chrome`. — Earth, Dec 11 '12 at 08:35

score 6 · Accepted Answer · answered Dec 11 '12 at 08:25

6

It may be issue of .indexOf not being supported. It basically is supported in IE9 unless some malicious doctype is triggering it to render page in IE7/8 mode. Than Array.indexOf method is not supported.

I suggest using HTML5 doctype for example (<!DOCTYPE html>) to make sure IE9 is rendering correctly.

answered Dec 11 '12 at 08:25

user1894004

116
2

I agree. Similar post [here](http://stackoverflow.com/questions/7792195/ie9-array-does-not-support-indexof). – tobias86 Dec 11 '12 at 08:30

score 2 · Answer 2 · edited May 23 '17 at 12:12

till IE8 it doesn't have .indexOf method , you can add it like this, if you are using IE9 check for compatibility mode

if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
        "use strict";
        if (this == null) {
            throw new TypeError();
        }
        var t = Object(this);
        var len = t.length >>> 0;
        if (len === 0) {
            return -1;
        }
        var n = 0;
        if (arguments.length > 1) {
            n = Number(arguments[1]);
            if (n != n) { // shortcut for verifying if it's NaN
                n = 0;
            } else if (n != 0 && n != Infinity && n != -Infinity) {
                n = (n > 0 || -1) * Math.floor(Math.abs(n));
            }
        }
        if (n >= len) {
            return -1;
        }
        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
        for (; k < len; k++) {
            if (k in t && t[k] === searchElement) {
                return k;
            }
        }
        return -1;
    }
}

IE9 does support it. You just need to make sure the page is running in IE9 mode. Old doc types might cause it to run in IE7/8 mode. See this [SO question](http://stackoverflow.com/questions/7792195/ie9-array-does-not-support-indexof) for more info : — tobias86, Dec 11 '12 at 08:30

score 0 · Answer 3 · answered Dec 11 '12 at 08:33

0

What is this line for

position > -1 && arrFruits.splice( position, 1 );

It evaluateto either true or false and then you don't do anything with it.that's probably causing a syntax error in IE, which the more forgiving Javascript engines on chrome and Firefox are ignoring.

Maybe you meant to make an if statement?

 if(position > -1) {
     arrFruits.splice( position, 1 ); 
}

answered Dec 11 '12 at 08:33

just.another.programmer

8,579
8
51
90

Both solutions work fine on all modern browsers (though the second one is a lot clearer indeed). – Julien Royer Dec 11 '12 at 12:37
I presume that means Ie9 treats && as a short-circuiting and? Is that part of the spec or just a convenient ms trick? – just.another.programmer Dec 12 '12 at 07:46

Code is not working in IE9

3 Answers3