Is there a way to do String.Format() in javascript?

Question

So I have a client who does not allow any server side coding, except in rare occurences classic asp, so everything is HTML and javascript.

So basically I need to build a URL from the form and then redirect. Javascript isn't necessarily my thing, but this would take me 5 minutes in asp.net using String.Format.

Is there a String.Format method in javascript?

You need to do something to teach your client that his all-javascript model is just wrong. — Joel Coehoorn
– Joel Coehoorn, Commented Dec 10, 2009 at 18:12
It's more like saying "Let's take a leaky boat" instead. — Joel Coehoorn
– Joel Coehoorn, Commented Dec 10, 2009 at 20:08

Community · Accepted Answer · 2017-05-23 10:33:02Z

4

Ouch, that sucks.

Stolen from another post:

String.format = function() {
  var s = arguments[0];
  for (var i = 0; i < arguments.length - 1; i++) {       
    var reg = new RegExp("\\{" + i + "\\}", "gm");             
    s = s.replace(reg, arguments[i + 1]);
  }

  return s;
}

edited May 23, 2017 at 10:33

CommunityBot

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answered Dec 10, 2009 at 18:12

Jerod Venema

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3 Comments

AutomatedTester Over a year ago

I think you mean String.prototype.format so that you can use it as "a {1} test".format("quick");

Andy E Over a year ago

Obviously he didn't mean that as the string is quite clearly the first argument but in most situations prototyping would be a better option.

Jerod Venema Over a year ago

True, you could use prototyping. The reasoning here is simply that c# (my language of choice) works in this manner. Personal preference though, prototyping would work fine too.

Community · Accepted Answer · 2017-05-23 12:02:59Z

0

no, there's no such thing in javascript, but some people have already written a printf for js

e.g JavaScript equivalent to printf/string.format

edited May 23, 2017 at 12:02

CommunityBot

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answered Dec 10, 2009 at 18:11

user187291

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Comments

mlo55 · Accepted Answer · 2011-01-20 02:22:34Z

0

I was looking for a similar thing and settled on Prototype's "Template" object.

From the Prototype examples



// the template (our formatting expression)
var myTemplate = new Template(
 'The TV show #{title} was created by #{author}.');

// our data to be formatted by the template
var show = {
  title: 'The Simpsons',
  author: 'Matt Groening',
  network: 'FOX'
};

// let's format our data
myTemplate.evaluate(show);
// -> "The TV show The Simpsons was created by Matt Groening."

answered Jan 20, 2011 at 2:22

mlo55

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