How to implement a sortable list in Vue?

Vue.js is a popular JavaScript front-end framework that helps developers quickly build interactive interfaces. Sorting lists is a common feature in web applications, and how to implement a sortable list is a technique that Vue.js developers need to know. This article will explore how to implement a sortable list in Vue.

1. Basic principles of implementing a sortable list

Implementing a sortable list in Vue mainly involves two aspects: one is data sorting, and the other is view update. For data sorting, we can implement it through the sort() method of JavaScript arrays. This method accepts an optional comparison function that determines how the elements in the array are ordered. For view updates, we can use the v-for directive in Vue to generate a list, and use Vue's responsive mechanism to achieve real-time updates of data.

When implementing a sortable list, we also need to consider the following aspects:

1. Sort method: ascending or descending order?
2. Sort field: Which field to sort by?
3. Drag and drop sorting: Supports sorting items in the list by dragging and dropping.

2. Implementation of sortable list based on Vue.js

Below we will implement a list that supports sorting and drag-and-drop sorting based on Vue.js.

1. Implementing the sorting method

We can define a sortList method to implement the function of sorting the list. This method accepts two parameters: sortField and sortOrder, which represent the sorting field and the sorting method respectively. In this method, we use the sort() method of JavaScript arrays to sort the list.

sortList(sortField, sortOrder) {
this.list.sort((a, b) => {

if (sortOrder === 'asc') {
  if (a[sortField] > b[sortField]) {
    return 1;
  } else if (a[sortField] < b[sortField]) {
    return -1;
  } else {
    return 0;
  }
} else {
  if (a[sortField] > b[sortField]) {
    return -1;
  } else if (a[sortField] < b[sortField]) {
    return 1;
  } else {
    return 0;
  }
}

});

2. Implementing draggable sorting

In order to implement draggable sorting, we need to use the drag-and-drop instruction v-draggable of Vue.js. This directive allows us to enable dragging functionality on an element. In this instruction, we can use event modifiers to listen for drag events to implement drag sorting.

 :key="item.id"
 v-draggable
 @dragstart="onDragStart(item, index)"
 @dragend="onDragEnd"
 @drop="onDrop">

In the above code, we use the v-for directive to generate the list and the v-draggable directive to enable drag and drop functionality. In the corresponding event listener, we can implement the drag-and-drop sorting function.

3. Implement view update

In order to achieve real-time update of the view, we need to manually trigger the $forceUpdate method of the Vue instance when the data source changes, thereby forcing Vue Instance re-renders the view.

onDragEnd() {
this.$forceUpdate();
}

3. Summary

In this article, we introduced the implementation in Vue The basic principles of sorted lists include data sorting and view updating, and an implementation of a sortable list based on Vue.js is given. In actual development, we can extend this implementation according to specific business needs.

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