No support for indexOf in IE 8? [duplicate]

Answer 1

According to http://msdn.microsoft.com/en-us/library/ie/53xtt423(v=vs.94).aspx

MS has said that it support indexof() to IE8 as well!

Answer 2

What happens if you do this instead?:

if(temp.indexOf(",") >= 0)

I know I've had cases where it seemed to not understand what the object type was when reference from an array instead of a variable created from the contents of that array location. It doesn't make sense that this would be the case, but I've used it as a workaround before.

Answer 3

IE versions < 9 don't have indexOf, so you can add your own:

if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (elt /*, from*/) {
        var len = this.length >>> 0;
        var from = Number(arguments[1]) || 0;
        from = (from < 0) ? Math.ceil(from) : Math.floor(from);
        if (from < 0) from += len;

        for (; from < len; from++) {
            if (from in this && this[from] === elt) return from;
        }
        return -1;
    };
}

---

var subItem = [];
subItem[1]="CSMTestPWXListinerService,CSMTestPWXListinerService_ManualyAdded";
console.log(subItem[1].indexOf(","));
//returns 25