checking to see if data attribute has a value or not

Question

i am quite new to jquery. i am trying to check on page load if data attribute has a value or is that empty. here is my html ``` data-tablet="img/xl.jpg" ``` How i wanna check if there is a path set or is it empty. here is my js ``` if ($('#myImg').data('tablet')=null) { alert('Path not Set'); }; ``` But it's giving me an error. can you please tell me how to resolve it. thanks.

Accepted Answer

First as pointed out in comments, you are missing an equal sign so you are not doing a comparison. Second issue is that if there is no data attribute it is `undefined`, not `null`.

```
if ($('#myImg').data('tablet')===undefined) {
```

checking to see if data attribute has a value or not

Solution

Problem