Why is indexOf not working in Internet Explorer?
This function executes during the forms onSubmit, and works fine in Firefox and Chrome, but not in IE. I suspect it's indexOf, but I cannot seem to find a way to get it to 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;
}
}
IE simply doesn't have this method on Array, you can add it yourself though, 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's missing (at this point that means you're in IE<9) then you can use it. As for why even IE8 doesn't have this already? I can't help you there...
If you are already using jQuery in your project you can use $.inArray()
http://api.jquery.com/jQuery.inArray/
indexOf() on MSIE 11 and others it doesn't like non-string variables. On suburbs add .toString() and it should fix it.
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