One of our websites is encountering a puzzling JS error in Internet Explorer. The console displays the following message:
':' expected
javascript:false, Line 1 Character 24
When attempting to trace the source of the error, a notification appears stating "For this error no source is available." This lack of information makes it difficult to pinpoint the origin.
This error message is quite confounding. Is there anyone who might have an idea what could be triggering this issue?
It seems like the problem lies within an incorrect object literal. Take for example:
let foo = {bar};
This exact code snippet can trigger the error you mentioned, particularly in IE 7 and 8.
It appears to be a case of an improperly formed object literal. For example, it may look like { foo bar } instead of the correct syntax which is { foo: bar }.
Some possible scenarios where a colon is expected include:
var obj = {foo: bar};var str = (i === 0 ? "yes" : "no");These examples could help in identifying the issue. However, if the problem only occurs in Internet Explorer, it may be related to automatic semicolon insertion. In such cases, running the scripts through JSLint can assist in detecting and resolving any ambiguities.
When it comes to Javascript, there is one specific place where a colon is commonly used - in ternary operators. (Note: Object literals also use colons, as some posters have pointed out)
Could it be that you have a line of code that appears to be a ternary operation but is missing the crucial colon? This theory is supported by the error message mentioning "false" as the part following the colon indicates the false action.
A similar error was encountered in this jsfiddle example: http://jsfiddle.net/CNTY8/
Error: Expected ':'
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