Vue.js Dynamic Class Binding Fails to Update

As I delve into learning Vue Js, I have been working on a simple todo app.

One interesting thing I've done is binding a class to my todo items based on whether todo.completed is true or not:

    <a v-bind:class="{iscomplete : todo.completed}">
    <input type="checkbox" v-on:change="markComplete" />

The iscomplete class simply adds a line through text decoration.

When the checkbox is clicked, it triggers the following method:

methods: {
    markComplete() {
      this.todo.completed = !this.todo.completed;
    }

This approach works well for existing todos within the DOM. However, when new todos are added, the dynamic class binding stops functioning properly.

I even created a short gif to showcase this issue.

Despite my efforts, I haven't been able to find a solution. It's possible that my limited experience with Vue is hindering my search for answers. If this has been discussed before and I missed it, I apologize.

Could someone shed some light on why this might be happening?https://i.sstatic.net/1fNKC.gif

Answer №1

It turns out that the methods are functioning correctly for new elements added to the DOM. I mistakenly set the property 'complete' to 'false' instead of 'completed' when creating my new todo object.

    prepareTodo: function () {
      const newTodo = {
        id: Math.random(2),
        description: this.todoDescription,
        complete: false,
      };

As a result, the method was trying to update a property that didn't exist and wasn't being referred to.

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