How can I write data attributes using Angular?

264
votes

When I try to use a data attribute in my template, like this:

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

2
angularangular2-template

2 Answers

540
votes

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>

See also :

45
votes

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)
}