How do I break a string across more than one line

Question

Is there a character in JavaScript to break up a line of code so that it is read as continuous despite being on a new line?

Something like....

1. alert ( "Please Select file   
2. \ to delete" );

Answer 1

ECMAScript 6 introduces template strings:

Template strings are string literals allowing embedded expressions. You can use multi-line strings and string interpolation features with them.

For example,

alert(`Please Select file   
to delete`);

will alert

Please Select file   
to delete

Answer 2

In your example, you can break the string into two pieces:

alert ( "Please Select file"
 + " to delete");

Or, when it's a string, as in your case, you can use a backslash as @Gumbo suggested:

alert ( "Please Select file\
 to delete");

Note that this backslash approach is not necessarily preferred, and possibly not universally supported (I had trouble finding hard data on this). It is not in the ECMA 5.1 spec.

When working with other code (not in quotes), line breaks are ignored, and perfectly acceptable. For example:

if(SuperLongConditionWhyIsThisSoLong
  && SuperLongConditionOnAnotherLine
  && SuperLongConditionOnThirdLineSheesh)
{
    // launch_missiles();
}