How can I write data attributes using Angular?

Question

I feel like I am missing something. When I try to use a data attribute in my template, like this:

<ol class="viewer-nav">
    <li *ngFor="#section of sections" data-sectionvalue="{{ section.value }}">
        {{ section.text }}
    </li>
</ol>

Angular 2 crashes with:

EXCEPTION: Template parse errors: Can't bind to 'sectionvalue' since it isn't a known native property ("
]data-sectionvalue="{{ section.value }}">{{ section.text }}

I'm obviously missing something with the syntax, please help.

Nicolás Alarcón Rapela · Accepted Answer · 2019-08-27 13:52:47Z

668

Use attribute binding syntax instead

<ol class="viewer-nav"><li *ngFor="let section of sections" 
    [attr.data-sectionvalue]="section.value">{{ section.text }}</li>  
</ol>

or

<ol class="viewer-nav"><li *ngFor="let section of sections" 
    attr.data-sectionvalue="{{section.value}}">{{ section.text }}</li>  
</ol>

6 Comments

Sean W Over a year ago

how do i access the value of the data attribute?

Günter Zöchbauer Over a year ago

Please create a new question with some code that demonstrates what you try to accomplish.

netzaffin Over a year ago

This should be Googles #1 answer for the Can't bind to '' since it isn't a known property of '' query. This comment might help a bit...

Stack Underflow Over a year ago

@netzaffin This is a useful answer but I've ran into the can't bind error many many times and this is the first time this was the actual problem/solution.

Devmaleeq Over a year ago

How do I bind a callback function to data-* attributes too?

|

Maksym Shmelyov · Accepted Answer · 2018-10-03 11:57:26Z

60

About access

<ol class="viewer-nav">
    <li *ngFor="let section of sections" 
        [attr.data-sectionvalue]="section.value"
        (click)="get_data($event)">
        {{ section.text }}
    </li>  
</ol>

And

get_data(event) {
   console.log(event.target.dataset.sectionvalue)
}

edited Oct 3, 2018 at 11:57

answered May 29, 2018 at 10:48

Maksym Shmelyov

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