Jun
21
C#’s String.Format For JavaScript
As a .Net Programmer I enjoy using String.Format frequently when working with strings, particularly in SQL statements. Now I don’t work with SQL in JavaScript but there are still plenty of times that I wish I could just whip out my handy dandy String.Format but sadly JavaScript does support this function…what’s that you say?…it does now?
I decided enough was enough and I extended the String object to include my beloved String.Format.
String.js
function _StringFormatInline()
{
var txt = this;
for(var i=0;i<arguments.length;i++)
{
var exp = new RegExp('\\{' + (i) + '\\}','gm');
txt = txt.replace(exp,arguments[i]);
}
return txt;
}
function _StringFormatStatic()
{
for(var i=1;i<arguments.length;i++)
{
var exp = new RegExp('\\{' + (i-1) + '\\}','gm');
arguments[0] = arguments[0].replace(exp,arguments[i]);
}
return arguments[0];
}
if(!String.prototype.format)
{
String.prototype.format = _StringFormatInline;
}
if(!String.format)
{
String.format = _StringFormatStatic;
}
I have given this feature 2 flavors; inline and static. For all you C#ers you know what a static method is, and inline, well I’ll just show you. Now you can do either of these:
Static
var str = String.format("This is a {0} string using the {1} method.","formatted","static");
Inline
var str = "This is a {0} string using the {1} method.".format("formatted","inline");
And a nice little sample page would go like this.
<html>
<head>
<title>String Extend</title>
<script src="String.js"></script>
<script>
var str = String.format("This is {0} story about {0} {1}.","my","dog");
var str2 = "I have 2 friends, {0} and {1}.".format("Doug","Jane");
alert(str + "\n\n" + str2);
</script>
</head>
<body>
</body>
</html>
Enjoy!
RSS ?
3 comments on this post
Cool one. I was looking for this type of utility since long.
Thanks Geekdaily team.
Your code is very usefull for me. Thanks very much.
Here’s my own take on it:
String.format = String.prototype.format = function() {
var i=0;
var string = (typeof(this) == “function” && !(i++)) ? arguments[0] : this;
for (; i < arguments.length; i++)
string = string.replace(/\{\d+?\}/, arguments[i]);
return string;
}