How to write HTML5 Data Attribute as JavaScript Array Elements

Question

I have the following code:

HTML:

 <span data-test="15, 17">

JavaScript / JQuery:

$value = [ $(object).data('test') ]

The $value variable now contains an array with one element. This element has the value "15, 17". I want to change the value of data-test in HTML in a way that $value will contain an array with two elements "15" and "17". In my environment I can only change the data-test attribute of the span. I can not change the JavaScript.

jsFiddle how the result currently looks like: ["15, 17"]

But I need it to be: ["15", "17"]

Is there any way?

Edit 1: I want to highlight the following part again: I can not change the JavaScript, only the HTML

Edit 2: I guess from the answers and comments below that with these requirements it is not possible to achieve the result I aimed for.

You can do it with javascript split() method: jsfiddle.net/3xfez/60 — user4227915
– user4227915, Commented Feb 18, 2015 at 15:24
If you really "can not change the JavaScript", then, no. You can't quite get the result you want. Rory's answer will get you an array-within-an-array, but that's as close as you'll get. — Paul Roub
– Paul Roub, Commented Feb 18, 2015 at 15:30
if you cant change the javascript, is impossible what you want. — user3998237
– user3998237, Commented Feb 18, 2015 at 15:42

Rory McCrossan · Accepted Answer · 2015-02-18 15:23:50Z

2

You need to store the value as a serialised array, in other words like this:

<span data-test="[15, 17]">

When jQuery stores it in the data cache object it will be deserialised to an array:

var value = $('span').data('test'); // == Array
console.log(value.length); // = 2

Updated fiddle

answered Feb 18, 2015 at 15:23

Rory McCrossan

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2 Comments

Paul Roub Over a year ago

Note that, for some reason, OP can change the HTML, but not the Javascript - so $value = [ $(object).data('test') ] will be run, giving [ [15, 17 ] ]

Rory McCrossan Over a year ago

@PaulRoub good point. I would highly suggest changing the JS if possible though.

score 0 · Accepted Answer · 2015-02-18 16:22:03Z

0

The right answer: is impossible what you want, if you can't change the Javascript.

However, using javascript, an way to do is:

var array = $('#demo').data('test').split(',');

Example: https://jsfiddle.net/3xfez/65/ (Don't forget to open the console.)

edited Feb 18, 2015 at 16:22

answered Feb 18, 2015 at 15:46

user3998237

Comments

mario.schlipf · Accepted Answer · 2015-02-18 15:29:18Z

0

You need to store the array in JSON format.

See this fiddle: https://jsfiddle.net/3xfez/62/

The correct data value should be: [15, 17].

<span id="demo" data-test="[15, 17]"></div>

answered Feb 18, 2015 at 15:29

mario.schlipf

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3 Comments

Paul Roub Over a year ago

You're linking to the OP's original fiddle, nothing changed there. And your code here has the same issue that's leading the OP to go all boldfaced - the JS can't be changed. You'll get nested arrays.

user3252254 Over a year ago

Nested array is not possible

mario.schlipf Over a year ago

@PaulRoub changed the fiddle. You're right that it will be a nested array, but it is still the only way to get an array from the data attribute from the provided js.

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