javascript code for removing last item from string if it exists

Question

i have a code which is avaliable in the following fiddle

code is like this

<a data-rel="http://mydomain.domian.com?z_9.asp&rpttype=298&sotBy=2sortOrder=1&pagenum=2">

$(document).ready(function() {
    var urlval = $("a").attr('data-rel');
    alert(urlval);
});

i am trying to remove the &pagenum=2 from the url if it exists, if it does not exists, then no problem, if exists, i want to remove that

what should i try here

I assume the page number's not always 2?

znap026
– znap026

2015-05-20 20:14:57 +00:00
Commented May 20, 2015 at 20:14 — znap026
– znap026, Commented May 20, 2015 at 20:14

Rick Hitchcock · Accepted Answer · 2015-05-20 20:34:42Z

4

Use a regular expression to replace &pagenum= followed by any number of digits.

Also check for the case where pagenum is the first parameter, in which case it follows a question mark instead of an ampersand:

var urlval = $('a').attr('data-rel').replace(/[\?&]pagenum=\d*/g, '');

edited May 20, 2015 at 20:34

answered May 20, 2015 at 20:24

Rick Hitchcock

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1 Comment

Tan Nguyen Over a year ago

I think this is the best solution without involving any 3rd party library to parse the URL

user3227295 · Accepted Answer · 2015-05-20 20:08:16Z

0

use this code

 $(document).ready(function() {
    var urlval = $("a").attr('data-rel');
    if(urlval.indexOf("pagenum")>-1){

     urlval=urlval.slice(0,urlval.lastIndexOf("&"));
    console.log(urlval);

    }
});

jsfiddle http://jsfiddle.net/wbagktuw/2/

answered May 20, 2015 at 20:08

user3227295

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Comments

Dan Moldovan · Accepted Answer · 2015-05-20 20:13:03Z

0

Or even better, why not just use what JS already has built-in..

urlval = urlval.replace('&pagenum=2', '');

This will handle both the cases where &pagenum=2 is present and not

answered May 20, 2015 at 20:13

Dan Moldovan

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2 Comments

Garis M Suero Over a year ago

what if &pagenum=3 ?

Dan Moldovan Over a year ago

In that case you can use regex. I didn't know that might change. You could write a regex query that checks for if &pagenum= followed by a number exists

znap026 · Accepted Answer · 2015-05-21 15:49:24Z

0

How about this, fiddle

  $(document).ready(function() {
    var urlval = $("a").attr('data-rel');
    var length = urlval.length
    var start = urlval.indexOf("&pagenum=");

    if (start !== -1){
        var next = urlval.indexOf("&",start+1);
        next = (next !== -1)?next:length;
        var res = urlval.substring(start, next);
        urlval = urlval.replace(res, '');
    }
    alert(urlval);
});

edited May 21, 2015 at 15:49

answered May 20, 2015 at 20:08

znap026

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3 Comments

Garis M Suero Over a year ago

What if pagenum=2 is not the last param? and it's before rpttype for example?

znap026 Over a year ago

Edited to account for that

znap026 Over a year ago

Edited incase there are params with practicaly the same name

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