Problem

In a SvelteJS project, I have a parent component that executes its own click code when the user clicks on it.

I also have a child component that is an <input> element of type="checkbox".

When the user clicks on the checkbox, the parent element executes its own click code as well.

However, I want the parent element to ignore this event and not execute its own click code when the checkbox is clicked. I tried using preventDefault but it didn’t work.

How can I achieve this in SvelteJS? (in my case SvelteKit but is the same)

Example Code

<!-- Parent Component -->
<div on:click={parentClickHandler}>
  <Child />
</div>

<!-- Child Component -->
<input type="checkbox" on:click={childClickHandler}>

In the code above, when the user clicks on the Child component (which is an input element of type checkbox), both the childClickHandler and the parentClickHandler are executed.

I tried using preventDefault in the childClickHandler but it didn’t work (it makes the things worse).

How can I prevent the parentClickHandler from executing when the checkbox is clicked?

>Solution :

To prevent the parentClickHandler from executing when the checkbox is clicked, you can stop the propagation of the click event from the child component to the parent component using the event.stopPropagation() method.

Here’s an example code:

<!-- Parent Component -->
<div on:click={parentClickHandler}>
  <Child on:click={childClickHandler} />
</div>
<!-- Child Component -->
<input type="checkbox" on:click={handleClick}>
// Child component's script

<script>
  function handleClick(event) {
    // stop the propagation of the click event to the parent component
    event.stopPropagation();
    // call the childClickHandler
    childClickHandler(event);
  }
</script>

In the example above, we have modified the Child component to call a handleClick function instead of the childClickHandler directly.

• This handleClick function first stops the propagation of the click event using event.stopPropagation(), and
• then calls the childClickHandler. By stopping the propagation of the event, we prevent the parentClickHandler from being executed when the checkbox is clicked.

Note that we also moved the on:click event listener from the input element to the Child component itself. This is because we want to intercept the click event in the Child component before it reaches the parent component.

I hope this helps!