jQ Format is not a Function

Question

I'm having this error when on this line when I'm formatting a string using jQuery, Uncaught TypeError: f.format is not a function

This is the line where the error seems to be appearing (I've got multiple lines using the same method but none of these seem to be working)

var $li = $(f.format(betid, bet.amount, bet.icon, bet.name, bet.amount));

Why is this happening? I've used this before and it worked just fine?

String:

var f = "<div>";
f += "<div class='avatar''>";
f += "<img src='{2}'>";
f += "</div>";
f += "<div>{3}</div>";
var num = bet.amount;
f += "<div class='user-bet ng-binding'>" + num + "</div>";
f += "</div></div>";

AFAIK there's no native ".format" method on Javascript strings. https://www.w3schools.com/jsref/jsref_obj_string.asp Are you missing a plugin? — ADyson, Apr 26 '17 at 21:05
Well, yeah, `f` is a [string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String), which does not have a format method. Are you confusing this with .NET? — Heretic Monkey, Apr 26 '17 at 21:05
As a reference, [here are the methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#Methods_2) that belong to a string in JavaScript... — War10ck, Apr 26 '17 at 21:06

score 1 · Accepted Answer · edited May 23 '17 at 12:25

1

string.format is not a function in Javascript

You can write such a function however:

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

From this question

edited May 23 '17 at 12:25

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answered Apr 26 '17 at 21:03

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Yeah, but I'm using jQuery as well? – Martin Dev Apr 26 '17 at 21:05
@MartinDev Doesn't matter. You're calling `.format()` on the string not a jQuery object. – War10ck Apr 26 '17 at 21:06
That was it, I usually put this code in the head of my pages, I completely forgot about it this time. Thank you for the anwser tho, I'll accept this as an anwser but it was my own fault. – Martin Dev Apr 26 '17 at 21:17

jQ Format is not a Function

1 Answers1