method jquery.data() sometimes uncaught typeError

Question

In this function:

function myFunction (el) {
  if(!el) return;
  //input <el> is DOM
  var $el = $(el),
      dataObject = $el.data('elementId');
  //code here
}

I have this error:

"Uncaught TypeError: Cannot read property '$a' of null" in line dataObject = $el.data('elementId');

When I comment the line

if(!el) return;

the error becomes

"Uncaught TypeError: Cannot read property '_a' of null"

I'm using jQuery 3.2.1

How can I fix this?

We don't see where you used $a so I don't know how can we help you... — user8517929
– user8517929, Commented Mar 23, 2018 at 2:33
I used Rollbar report when bug. I cannot build case like this >"< — user3739680
– user3739680, Commented Mar 23, 2018 at 2:37

score 0 · Accepted Answer · 2018-03-23 11:14:41Z

0

function a(el) {
  if(!el) return;
  //input <el> is DOM
  var $el = $(el),
      dataObject = $el.data('elementid');
  //code here
  console.log(dataObject);
  console.log($el.attr('data-elementid'));
}
a(document.getElementById('two'));
a();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="two" data-elementid="a">2</div>

Try using attr instead of data? But by this answers:

this

if you set all to lowercase it will return data value.

edited Mar 23, 2018 at 11:14

answered Mar 23, 2018 at 3:04

user8517929

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5 Comments

user3739680 Over a year ago

hmmm I don't think set all to lowercase is solution in this problem, and I can't set all attributes in my program, Ty

user8517929 Over a year ago

I need to see your program whole code but this one part I can't know what are your problems. I just copied your code and when you run it here on my answer it returns value from requested data..

CertainPerformance Over a year ago

@StupidKid the problem is that $el is sometimes null, which is upstream of anything that happens with .data.

user3739680 Over a year ago

@CertainPerformance yep, I think so, when I comment line if(!el) return; Error like this "Uncaught TypeError: Cannot read property '_a' of null". When I check is_null(el), Error like "Uncaught TypeError: Cannot read property '$a' of null" I think problem in jQuery but I haven't solution to fix it. because sometime error's appears

CertainPerformance Over a year ago

@user3739680, so, a simple enough solution would be to var $el = $(el); if (!$el) return; Or you could avoid jquery entirely, it's not necessary for this

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