删除某个字符后的所有内容

Question

Is there a way to remove everything after a certain character or just choose everything up to that character? I'm getting the value from an href and up to the "?", and it's always going to be a different amount of characters.

Like this

/Controller/Action?id=11112&value=4444

I want the href to be /Controller/Action only, so I want to remove everything after the "?".

I'm using this now:

 $('.Delete').click(function (e) {
     e.preventDefault();

     var id = $(this).parents('tr:first').attr('id');                
     var url = $(this).attr('href');

     console.log(url);
 }

Answer 1

var s = '/Controller/Action?id=11112&value=4444';
s = s.substring(0, s.indexOf('?'));
document.write(s);

Sample here

I should also mention that native string functions are much faster than regular expressions, which should only really be used when necessary (this isn't one of those cases).

Updated code to account for no '?':

var s = '/Controller/Action';
var n = s.indexOf('?');
s = s.substring(0, n != -1 ? n : s.length);
document.write(s);

Sample here

Answer 2

You can also use the split() function. This seems to be the easiest one that comes to my mind :).

url.split('?')[0]

jsFiddle Demo

One advantage is this method will work even if there is no ? in the string - it will return the whole string.

Answer 3

var href = "/Controller/Action?id=11112&value=4444";
href = href.replace(/\?.*/,'');
href ; //# => /Controller/Action

This will work if it finds a '?'and if it doesn't

Answer 4

It works for me very nicely:

var x = '/Controller/Action?id=11112&value=4444';
var remove_after= x.indexOf('?');
var result =  x.substring(0, remove_after);
alert(result);

Answer 5

May be very late party :p

You can use a back reference $'

$' - Inserts the portion of the string that follows the matched substring.

 let str = "/Controller/Action?id=11112&value=4444" let output = str.replace(/\\?.+/g,"$'") console.log(output)

Answer 6

If you also want to keep "?" and just remove everything after that particular character, you can do:

var str = "/Controller/Action?id=11112&value=4444",
    stripped = str.substring(0, str.indexOf('?') + '?'.length);

// output: /Controller/Action?

Answer 7

if you add some json syringified objects, then you need to trim the spaces too... so i add the trim() too.

let x = "/Controller/Action?id=11112&value=4444";
let result =  x.trim().substring(0,  x.trim().indexOf('?'));  

Answer 8

为我工作：

      var first = regexLabelOut.replace(/,.*/g, "");

Answer 9

You can also use the split() method which, to me, is the easiest method for achieving this goal. Ex.:

 let dummyString ="Hello Javascript: This is dummy string" dummyString = dummyString.split(':')[0] console.log(dummyString) // Returns "Hello Javascript"

Source: https://thispointer.com/javascript-remove-everything-after-a-certain-character/

Answer 10

It can easly be done using JavaScript for reference see link JS String

EDIT it can easly done as. ;)

var url="/Controller/Action?id=11112&value=4444 ";
var parameter_Start_index=url.indexOf('?');
var action_URL = url.substring(0, parameter_Start_index);
alert('action_URL : '+action_URL);