I am looking to dynamically assign CSS classes to elements in my HTML document. Additionally, my project utilizes Angular 5 and Bootstrap version 3.3.7

I am currently in the process of generating a table using data obtained from a JSON. Due to the potential for a large amount of data, I have implemented a loop to create all the rows within the table. My goal is to enable users to click on any specific row and have that particular row expand to display a second row containing additional information listed under list.extraInfo. Here's what the code looks like:

<tbody *ngFor= " let list of lists, let i = index ">
   <tr data-toggle="collapse" data-target="#{{i}}" class="clickable">
      <td > something </td>
      <td >{{i+1}}</td>
      <td >{{list.name}}</td>
   </tr>
   <tr >
      <td colspan="3">
        <div id="{{i}}" class="collapse">
            {{list.extraInfo}}
        </div>
      </td>
  </tr>
</tbody>

Although I'm fully aware that using data-target="#{{i}}" and id="{{i}}" isn't effective, I haven't been able to determine the correct way to assign a unique identifier to each individual row in order to ensure that the collapsing feature functions properly when clicking on a row.

Currently, the extraInfo row opens for the first row regardless of which row I attempt to click on.

Answer №1

When it comes to curly brace syntax ({{ }}), also known as interpolation, it is intended for use within inner HTML elements. This explains why {{i+1}} functions properly within a td tag, but not within a tr tag. When handling variables in a <tr> attribute, there is no need to enclose them in curly braces.

Furthermore, the error message stating

Can't bind to 'target' since it isn't a known property of 'tr'.
indicates that an input binding attribute should be used instead:

<tr data-toggle="collapse" [attr.data-target]="'#'+ i" class="clickable">

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