Why is my .data() function returning

Properly expressing JSON styled attributes

Your .data() usage might return unexpected values if there's something amis with JSON inside the data-attribute:

<div id="yourElement" data-array='["value1", "value2"]'></div>


As one might say, Git commit and ye shall receive - with .data("array") giving you the expected result due to valid JSON with double-quote enclosed strings.

Common pitfalls and solutions

Clean JSON is happy JSON

It's always wise to validate your JSON before taking the leap of faith using it. Online tools embody the safety ropes here - they'll catch you if you fall.

Syntax - your language's DNA

For the .data() function in jQuery, you should ensure you are calling - data('key'). Remember, no one likes a syntax party pooper.

Quote-ception

If you want your jQuery party to keep swinging, make sure your quotation marks are in good order:

• JSON styled values - double quotes "".
• Wrapping JSON values - single quotes ''.

Adhering to this format ensures the JSON party goes without dissonance:

<div id="yourElement" data-array='["correct", "format"]'></div>


Get your hands dirty with data

Decoding the mysteries of .data()

jQuery is like your local decoding expert. Present it a JSON string in a data attribute and it will automatically convert it to a JavaScript object or array.

Creating and handling complex data

If your data seems like it’s solving the Da Vinci code, you'd better use – $.data(element, key, value). It's your master key to manipulate and query your associated data.

Access arrays at the right index

Access array elements with the right index, especially important when operating on non-JSON data attribute:

<div id="yourElement" data-array="value1,value2,value3"></div>


Then just run this magic code:

// Remember, programmers are like wizards - we love to "split"!
var items = $('#yourElement').data('array').split(',');


Level up your .data() game

Saying NO to eval()

Never ever use eval() in JavaScript. It’s just like inviting nightmares into your code. Look for other safer alternatives. You have been warned!

Dealing with rebellious .data()

If .data() function seems to be walking on a rebellion, consider using .attr(), a direct approach to fetch attribute values.

Sick of parseJSON's rules?

Make sure your data doesn't break the parseJSON's rules. Keep all data in line with JSON format.

A wild parsing error appears.

Avoid using mismatched quotation marks, Pokemon won't capture this critter. It's probably the biggest nuisance while parsing data!

References