how to declare var without spaces in javascript

Question

I have to declare a variable but the value is coming runtime from some text strings.Can someone please suggest howto remove the spaces and line breaks so that variable is declare properly?

var view_Invoice= '

     invoice

';

It giving an error.

Trim it before putting it out. Else view_Invoic = view_Invoic.trim() — Lain
– Lain, Commented Jul 17, 2018 at 20:25
If you're using a programming language like Java, PHP, Python, Ruby, etc to generate Javascript code, use methods provided by these languages, for example, in Java you can use the method trim() as follow var view_Invoice = '<%= string.trim()%>' — Ele
– Ele, Commented Jul 17, 2018 at 20:27
Yeah... I think everyone except Ele is completely missing the question here. OP needs template literals (as long as IE support isn't needed) or a server side solution. — Joseph Marikle
– Joseph Marikle, Commented Jul 17, 2018 at 20:30

Lain · Accepted Answer · 2018-07-17 20:29:49Z

3

Trim it before putting it out in javascript. Changing the string delimiter also works in some browsers (which support ES6):

var view_Invoice= `

     invoice

`;

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

answered Jul 17, 2018 at 20:29

Lain

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ChrisW · Accepted Answer · 2018-07-23 21:51:34Z

1

The fundamental reason for why you're seeing this error is that the variable doesn't start with a valid character:

An identifier must start with $, _, or any character in the Unicode categories > “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, “Titlecase letter (Lt)”, “Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)”.

In your case, the easiest way to fix the problem will be to trim the white space from the beginning of the string. If you only want the whitespace at the beginning of the string to be removed, you can use

.replace(/^\s+/g, "")

but if you're happy for the whitespace at both the beginning and end of the whitespace removed you can use the .trim() function

edited Jul 23, 2018 at 21:51

answered Jul 17, 2018 at 20:28

ChrisW

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