How can get an number in the string with javascript

Question

I simply want to get 15 in a string like:

countryNo=-1&count=15&page=2

How can I make it work?

Will the string always be formatted exactly like that, or could there be other variables before it? Are you actually asking how you get a value from a querystring? The answer to what you've actually asked is `var value = "15";` so please be clearer about what you want. — Reinstate Monica Cellio, Oct 18 '13 at 13:04
"countryNo=-1&count=15&page=2" this will serve what you need, — Robin, Oct 18 '13 at 13:05
possible duplicate of [How can I get query string values?](http://stackoverflow.com/questions/901115/how-can-i-get-query-string-values) — Barmar, Oct 18 '13 at 13:06

score 3 · Accepted Answer · answered Oct 18 '13 at 13:05

Try this.

var myQuery = getQueryVariable('count');

function getQueryVariable(variable) {
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] == variable) 
            return pair[1];
    }
}

Ibrahim Najjar · Answer 2 · 2013-10-18T13:17:19.357

2

var x = "countryNo=-1&count=15&page=2";
var n = /(?:^|&)count=(\d+)/.exec(x)[1];

edited Oct 18 '13 at 13:17

answered Oct 18 '13 at 13:05

Ibrahim Najjar

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Oops, your code broke: `something=5&other-count=6&count=7` – tckmn Oct 18 '13 at 13:06
1

That will then break if you had `count=5&xyz=7` – andy Oct 18 '13 at 13:14
@andy The problem is that no body knows if the format of the target string could vary as this might open a lot of potentials. – Ibrahim Najjar Oct 18 '13 at 13:16
@andy Problem fixed, although as I say no body can tell the true format. – Ibrahim Najjar Oct 18 '13 at 13:17
True, Parsing anything with Regex is hard :p – andy Oct 18 '13 at 13:18

andy · Answer 3 · 2013-10-18T13:11:40.500

1

'other-count=155&count=175&page=2'.match(/(&|^)count\=([0-9]+)/)

is the code you want. It'll return an array containing: count=15 and 15 on its own.

You'll want to grab the last value from the returned array that contains the number on its own.

function extract_count(string) {
  match = string.match(/[&|^]count\=([0-9]+)/)

  return (match.length != 0) ? match[match.length-1] : null;
}

That will return 175 in the above example.

edited Oct 18 '13 at 13:11

answered Oct 18 '13 at 13:04

andy

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Oops, your code broke: `something=5&other-count=6&count=7` – tckmn Oct 18 '13 at 13:05
Fair point! Just the simplest way I thought of doing it. @Arnaldo's answer is probably better in this case. – andy Oct 18 '13 at 13:06
Updated it so it works now – andy Oct 18 '13 at 13:08

score 0 · Answer 4 · answered Oct 18 '13 at 13:06

You could split the string up into parts and create an associative array.

var q = "countryNo=-1&count=15&page=2";

var vars = [], hash;
    if(q != undefined){
        q = q.split('&');
        for(var i = 0; i < q.length; i++){
            hash = q[i].split('=');
            vars.push(hash[1]);
            vars[hash[0]] = hash[1];
        }
}

var count = vars['count'];

How can get an number in the string with javascript

4 Answers4