JavaScript & jQuery: The Missing Manual ... - Robert Guajardo

Top JavaScript
Programming
Mistakes
Then finish the object:
var options = {
rules : {
name : 'required',
email: 'email'
},
messages : {
name : 'Please type your name',
email: 'Please type your e-mail address.'
}
};
This approach lets you check your work through various steps and makes it a lot
easier to identify any mistakes in punctuation.
Table 15-1. Firefox’s Error Console (discussed on page 35) provides the clearest description of syntax
error messages. When a script isn’t working, preview it in Firefox and review the Error Console. Here are
a few of the most common error messages and what they mean.
Firefox error message Explanation
Unterminated string literal Missing opening or closing quote mark:
var name = Jane' ;
Error also appears with mismatched quote marks:
var name = 'Jane";
Missing ) after argument list Missing closing parenthesis when calling a function or method:
alert('hello' ;
Missing ) after condition Missing closing parenthesis within a conditional statement:
if (x==0
Missing ( before condition Missing opening parenthesis within a conditional statement:
if x==0)
Missing } in compound
statement
470 javascript & jquery: the missing manual
Missing closing brace as part of conditional loop:
if (score == 0) { alert('game over'); // missing }
on this line
Missing } after property list Missing closing brace for JavaScript object:
var x = { fName: 'bob', lName: 'smith' // missing
} on this line
Syntax Error General problem that prevents JavaScript interpreter from
reading the script.
Missing ; before statement Lets you know when you’ve run two statements together on
a single line, without separating them with a semicolon. You’ll
also see this when you incorrectly nest quotation marks:
var message='There's an error here.';
Missing variable name Appears if you attempt to use a JavaScript reserved word (see
page 47) for a variable name:
var if="Syntax error.";
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