How to implement active deletion of lists in Vue

Vue is a very popular JavaScript framework that allows us to easily build web applications. Among them, a key feature of Vue is its list management capabilities in the page, allowing us to easily render and manage large amounts of data. However, in actual operation, you may encounter situations where you need to actively delete the list. This article will introduce how to implement active deletion of lists in Vue.

1. Vue list rendering

Vue list rendering is a powerful feature of Vue, which allows us to render data into a list of pages without manually writing template code. Next, let's see how to use Vue list rendering:

Vue list rendering can be accomplished with a simple v-for directive, which is similar to the for loop structure commonly used in JavaScript. In Vue, all the data in an array can be rendered to the page through the v-for instruction.

For example, suppose we have a list data as follows:

data: {
  list: ['苹果', '香蕉', '橙子']
}

We can use Vue’s v-for directive to render it onto the page as follows:

<ul>
  <li v-for="(item, index) in list" :key="index">{{item}}</li>
</ul>

Here, the v-for directive will traverse the list data and render each list item as a

element. The v-for directive contains two parameters in parentheses: item is the value of the current list item, and index is the index of the current list item.

2. Vue actively deletes the list

For the situation where the Vue list needs to be deleted, we can achieve it through the following steps:

1. Define a method

We need to define a method in the Vue object that will delete the specified item in the list. For example, the following code implements a method to delete a specified item in a list:

methods: {
  removeItem: function (index) {
    this.list.splice(index, 1);
  }
}

In the delete method, we use list.splice(index, 1) to delete the element at the specified index from the list. The first parameter of the splice method is the index of the element to be deleted, and the second parameter is the number of elements to be deleted.

2. Call the delete method

We can use the v-on directive in the template to call the delete method. For example, the following code will call the removeItem method when the user clicks a list item:

<ul>
  <li v-for="(item, index) in list" :key="index" v-on:click="removeItem(index)">{{item}}</li>
</ul>

In this code, we have added a v-on directive to call the removeItem method. When the user clicks on a list item, the v-on directive calls the removeItem method, passing the index of the list item as a parameter to the method.

3. Vue list animation

In addition to actively deleting lists in Vue, we can also enhance the user experience of the list by adding transition animations. Vue uses transition and animation to define transition animations.

1. CSS Transition

We can define CSS transition effects in the CSS style sheet, as shown below:

.list-enter-active, .list-leave-active {
  transition: opacity .5s;
}
.list-enter, .list-leave-to{
  opacity: 0;
}

Here, we define a name It is the class of list, which contains two subclasses: list-enter and list-leave-to. These classes are automatically applied to list items when they are inserted or deleted.

2. Using the element

We can use Vue’s element to apply transition animations to lists. For example, the following code will add a transition animation effect to the list:

<ul>
  <transition name="list">
    <li v-for="(item, index) in list" :key="index" v-on:click="removeItem(index)">{{item}}</li>
  </transition>
</ul>

Here, we wrap the

tag we used earlier directly in the element. Then, we define a transition effect named list in the CSS style sheet and apply it to the element.

The final effect is that when we delete list items, they disappear from the page in a gradient manner instead of disappearing immediately.

Conclusion

By using Vue, we can easily render and manage large amounts of data and proactively remove items from the list by defining methods. Additionally, we can enhance the user experience of the list by adding CSS transitions and using the element. I hope this article is helpful to you, if you have any questions or feedback, please leave it in the comment section.

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