Question

I am working on Google Calendar API. Whenever I create any event and enter the description of that event having new line, It gives me error like:

“Unterminated String constant”.

I am passing that Event Description from Java to Javascript. So how to format the string having new line?

My code is:

 var EventDescription='<% =eventDetails.getEventDescription(eventIndex)%>'

    eventDetails -java class 
    getEventDEscription -Method to get the Description of event.
    eventIndex - no of the event whoes Description is needed .

It is working properly otherwise .only giving error when description is having new line.

Answer 1

Try to imagine yourself as the JSP container, then as the JavaScript interpreter. Or simply look at the source code of the generated HTML page.

The line

var EventDescription='<% =eventDetails.getEventDescription(eventIndex)%>'

is interpreted by the JSP container. So eventDetails.getEventDescription(eventIndex) is executed, and the result of this method call is put in the response. Suppose the result is composed of two lines:

line 1
line 2

So the generated JavaScript code is:

var EventDescription='line1
line 2'

And this is invalid JavaScript code. The correct JavaScript code would be

var EventDescription='line1\nline 2'

So, you need to JavaScript-escape the result of the Java method call before putting it in the response. Look at Apache commons-lang StringEscapeUtils.escapeEcmaScript() method.