vue var bleed test

vue var bleed test

by Christopher O

HTML

<div id="app">
  <h2>Todos:</h2>
  <ol>
    <li v-for="todo in todos">
      <label>
        <input type="checkbox"
          v-on:change="toggle(todo)"
          v-bind:checked="todo.done">

        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
        </span>
      </label>
    </li>
  </ol>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
      { text: "Play around in JSFiddle", done: true },
      { text: "Build something awesome", done: true }
    ]
  },
  methods: {
  	toggle: function(todo){
    	todo.done = !todo.done
    }
  },
  mounted: function() {
  	// This creates a pointer!! Changes to foo modify todos!!!
  	let foo = this.todos;
    foo.pop();
    foo.pop();
    foo.push({ text: "This should not bleed back into todos", done: true });
    
    // This creates a copy of the data. Changes to bar no not modify todos
    // Use lodash to clone only the data: let bar = _.cloneDeep(this.todos);
    // https://stackoverflow.com/questions/48363604/vuejs-copying-data-object-and-removing-property-will-remove-the-property-from-or
    let bar = _.cloneDeep(this.todos);
    bar.pop();
    bar.pop();
    bar.push({ text: "Does not bleed", done: true });
  },
})