Remove comma from javascript array

Question

Hi all I am framing a url with Query string in javascript as follows every thing works fine but a comm is coming in between the query string so can some one help me

<script type="text/javascript">
    function RedirectLocation() {
        var cntrl = "Q1;Q2";
        var str_array = cntrl.split(';');
        var cnt = str_array.length;
        if (cnt == 0) {
            location.href = '/callBack.aspx';
        }
        else {
            var arr = [];
            for (var i = 0; i < str_array.length; i++) {
                str_array[i] = str_array[i].replace(/^\s*/, "").replace(/\s*$/, "");
                arr.push(str_array[i] + '=1');
                if (i != str_array.length - 1) {
                    arr.push('&');
                }
            }
            location.href = '/Sample.aspx?' + arr;
        }
    }
</script>

This is giving me the query string as follows Sample.aspx?Q1=1,&,Q2=1 I need this to be like `Sample.aspx?Q1=1&Q2=1

Answer 1

To remove the commas from a string you could simply do

s = s.replace(/,/g,'');

But in your specific case, what you want is not to add the commas. Change

location.href = '/Sample.aspx?' + arr;

to

location.href = '/Sample.aspx?' + arr.join('');

What happens is that adding an array to a string calls toString on that array and that function adds the commas :

""+["a","b"] gives "a,b"

Answer 2

Don't rely on the implicit string conversion (which concatenates the array elements with a comma as separator), explicitly .join the array elements with & :

var arr = [];
for (var i = 0; i < str_array.length; i++) {
    str_array[i] = str_array[i].replace(/^\s*/, "").replace(/\s*$/, "");
    arr.push(str_array[i] + '=1');
}
location.href = '/Sample.aspx?' + arr.join('&');

Think about it like this: You have a set of name=value entries which you want to have separated by & .

Answer 3

You can use arr.join(glue) to concatenate Array elements with something inbetween. In your case glue would be an empty string arr.join("") .