How to bind to a data attribute using Angular 2+?

Question

I am using a data table created mostly with css that I found online. In one of the columns there is a css data attribute "data-title" which is assigned a string.

<td data-title="someString">

When I enter a string, the styling inside the column works as expected. When I try to bind to an objects string, the binding doesn't work like I would expect. I tried

<td data-title="object.someString">

which just displays literal 'object.someString' and I tried

<td data-title="{{object.someString}}">

which displays nothing (blank). Any idea why my binding isn't working here?

CSS:

.responsive-table tbody td[data-title]:before {
  content: attr(data-title);
  float: left;
  font-size: .9em;
  color: #565248;
}

@media (min-width: 48em) {
  .responsive-table tbody td[data-title]:before {
    content: none;
  }
}

Please post the relevant CSS. Is it using the `td::before { content: attr('data-title'); }` property and function? — Dai, Sep 06 '17 at 00:01
Please undo your edit that *incorrectly* refers to the attributes as "CSS selector attributes". The `data-` attributes are not "CSS selector attributes". CSS selectors can use any element attribute. — Dai, Sep 06 '17 at 00:06

score 26 · Accepted Answer · answered Sep 06 '17 at 00:05

26

Angular 2 doesn't bind to data- attributes using the simpler {{ }} syntax because it tries to map them to DOM properties, and there isn't a DOM property for data-title (and it seems Angular2 isn't smart enough to use dataset yet - unless I'm missing something).

So to bind to data- attributes you need to use the attr.data-title={{}} or [attr.data-...]="" syntax. See this QA: Angular 2 data attributes

<td [attr.data-title]="object.someString">

Or:

<td attr.data-title="{{object.someString}}">

answered Sep 06 '17 at 00:05

Dai

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It is completely valid for me ! Thanks! – Alberto De Francisco Martín Mar 15 '18 at 12:45
Can i also bind a function to data-* attribute? I've tried but it just doesn't work. – Devmaleeq Mar 30 '21 at 19:14

How to bind to a data attribute using Angular 2+?

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