Why does indexOf not work in Internet Explorer?

Question

This function is executed during onSubmit forms and works fine in Firefox and Chrome, but not in IE. I suspect indexOf, but I cannot find a way to make it work.

function checkSuburbMatch(e) {

var theSuburb = document.getElementById('suburb').value;
var thePostcode = document.getElementById('postcode').value;

var arrayNeedle = theSuburb + " (" + thePostcode + ")";

if(suburbs.indexOf(arrayNeedle) != -1) {
    alert("Suburb and Postcode match!");
    return false;
} else {
    alert("Suburb and Postcode do not match!");
    return false;
}

}

Answer 1

IE just doesn't have this method on Array , you can add it yourself, from MDC :

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;
  };
}

This adds .indexOf()if it is absent (at this moment it means that you are in IE <9), you can use it. As for why even IE8 doesn't have this? I can not help you...

Answer 2

jQuery , $.inArray()

http://api.jquery.com/jQuery.inArray/

Answer 3

indexOf() MSIE 11 , . .toString(), .

Answer 4

.

var a = new Array();

a["one"] = "1";

for(var i in a){

   alert(i)

}

0, indexOf, , indexOf .

, ""

jQuery!

-Mekias