escape sequence javascript

Question

How can I pass variable to other function in this condition , I'm inserting textarea through javascript with single quotes, but when it gets called myFunction(abc123), it looks like this, the function suppose to be like this when it is called - myFunction('abc123')

so what should i do ?

myNum=123;
focusVar = "abc"+myNum;

$("#myDiv").append('<textarea onFocus="onFocusReportReply('+focusVar+')" onBlur="onBlurReportReply()" id="replyReportText'+data.activityId1+'">')

focusVar = "'abc"+myNum+"'";

xdazz
– xdazz

2012-10-23 10:41:38 +00:00
Commented Oct 23, 2012 at 10:41 — xdazz
– xdazz, Commented Oct 23, 2012 at 10:41

user1726343user1726343 · Accepted Answer · 2012-10-23 10:41:53Z

2

$("#myDiv").append('<textarea onFocus="onFocusReportReply(\''+focusVar+'\')" onBlur="onBlurReportReply()" id="replyReportText'+data.activityId1+'">')

Backslashes escape special characters, in this case string delimiters.

answered Oct 23, 2012 at 10:41

user1726343

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jAndy · Accepted Answer · 2012-10-23 10:42:14Z

2

You can either use double quotes or escaped single quotes.

var foo = 'onFocus=myFunc("' + focusVar + '") moar';

or

var foo = 'onFocus=myFunc(\'' + focusVar + '\') moar';

To escape special characters, you need a leading backslash. Examples are

\t (tabulator)
\n (line feed)
\\ (backslash)

answered Oct 23, 2012 at 10:42

jAndy

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7 Comments

user1726343 Over a year ago

He can't use double quotes because those delimit his attribute value.

jAndy Over a year ago

@Asad: thats why my first example just uses doublequotes for the inner parameters. He doesn't need to quote the whole attribute

user1726343 Over a year ago

Perhaps it isn't imperative to quote your attribute values, but it is good practice.

jAndy Over a year ago

@Asad: I wouldn't know why it is "not good practice" to use an unquotet attribute value. W3C allows for all types, single-quoted, double-quoted and not-quoted.

user1726343 Over a year ago

Well for one, your HTML is instantly non XHTML, and some validators have trouble parsing just HTML if there are unquoted attributes. Another (more significant) disadvantage is that you can't have spaces in your attribute values.

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Nelson Benítez León · Accepted Answer · 2012-10-23 10:43:15Z

0

Enclose your string inside single quotes, like this:

myNum=123;
focusVar = "'abc"+myNum+"'";

answered Oct 23, 2012 at 10:43

Nelson Benítez León

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