I'm trying to use this code to replace spaces with _, it works for the first space in the string but all the other instances of spaces remain unchanged. Anybody know why?
function updateKey()
{
var key=$("#title").val();
key=key.replace(" ","_");
$("#url_key").val(key);
}
This question is related to
javascript
string
Try .replace(/ /g,"_");
Edit: or .split(' ').join('_') if you have an aversion to REs
Edit: John Resig said:
If you're searching and replacing through a string with a static search and a static replace it's faster to perform the action with .split("match").join("replace") - which seems counter-intuitive but it manages to work that way in most modern browsers. (There are changes going in place to grossly improve the performance of .replace(/match/g, "replace") in the next version of Firefox - so the previous statement won't be the case for long.)
Just using replace:
var text = 'Hello World';_x000D_
_x000D_
new_text = text.replace(' ', '_');_x000D_
_x000D_
console.log(new_text);const updateKey = key => console.log(key.split(' ').join('_'));
updateKey('Hello World');I created JS performance test for it http://jsperf.com/split-and-join-vs-replace2
You can try this
var str = 'hello world !!';
str = str.replace(/\s+/g, '-');
It will even replace multiple spaces with single '-'.
I know this is old but I didn't see anyone mention extending the String prototype.
String.prototype.replaceAll = function(search, replace){
if(!search || !replace){return this;} //if search entry or replace entry empty return the string
return this.replace(new RegExp('[' + search + ']', 'g'), replace); //global RegEx search for all instances ("g") of your search entry and replace them all.
};
Replace spaces with underscore
var str = 'How are you';
var replaced = str.split(' ').join('_');
Output: How_are_you
To answer Prasanna's question below:
How do you replace multiple spaces by single space in Javascript ?
You would use the same function replace with a different regular expression. The expression for whitespace is \s and the expression for "1 or more times" is + the plus sign, so you'd just replace Adam's answer with the following:
key=key.replace(/\s+/g,"_");
You can try this
var str = 'hello world !!';
str = str.replace(/\s+/g, '-');
It will even replace multiple spaces with single '-'.
const updateKey = key => console.log(key.split(' ').join('_'));
updateKey('Hello World');Just using replace:
var text = 'Hello World';_x000D_
_x000D_
new_text = text.replace(' ', '_');_x000D_
_x000D_
console.log(new_text);Replace spaces with underscore
var str = 'How are you';
var replaced = str.split(' ').join('_');
Output: How_are_you
I created JS performance test for it http://jsperf.com/split-and-join-vs-replace2
To answer Prasanna's question below:
How do you replace multiple spaces by single space in Javascript ?
You would use the same function replace with a different regular expression. The expression for whitespace is \s and the expression for "1 or more times" is + the plus sign, so you'd just replace Adam's answer with the following:
key=key.replace(/\s+/g,"_");
I know this is old but I didn't see anyone mention extending the String prototype.
String.prototype.replaceAll = function(search, replace){
if(!search || !replace){return this;} //if search entry or replace entry empty return the string
return this.replace(new RegExp('[' + search + ']', 'g'), replace); //global RegEx search for all instances ("g") of your search entry and replace them all.
};
Source: Stackoverflow.com