How to use and effect the drag-and-drop sorting function in Vue documents

Vue is one of the most popular front-end frameworks today. It provides a wealth of functions and tools to help us develop various web applications conveniently. One very useful feature is drag and drop, which allows users to drag elements from one location on the page to another. Vue provides some built-in commands and functions that make it easy to create and manage drag-and-drop operations, including drag-and-drop sorting functions. This article will introduce the use and effect of the drag and drop sorting function in the Vue document.

What is the drag sort function?

The drag sorting function is a function provided by Vue, which is used to implement drag operations and sort drag elements. It allows us to change the order of elements by dragging with the mouse, and it is instantly reflected on the view. It can be applied to various scenarios, such as sorting a list, sorting a task list, sorting images, etc.

In the Vue document, the drag and drop sorting function is provided by the Vue framework and does not need to be downloaded or imported separately.

How to use the drag and drop sorting function?

We can enable drag functionality by using Vue’s built-in directive v-draggable. This directive can be applied to any HTML element and provides many options and event handlers. Here is a basic example:

<template>
  <div v-draggable="options">
    <div v-for="(item, index) in items" :key="index">{{ item }}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: ["Item 1", "Item 2", "Item 3"],
      options: {
        draggable: ".draggable",
        handle: ".handle",
        animation: 200
      }
    }
  }
}
</script>

In the above code, we add v-draggable to the outer container element (i.e. <div> tag) command to enable drag functionality. We then use the <code>v-for directive to generate a list containing all sortable elements. We also define some drag and drop options in the data properties, such as enabling CSS selectors for draggable elements, target elements for dragged elements, etc.

We can add an onDragEnd event handler in the methods property of the Vue instance to respond to events triggered when the user drags an element. In onDragEnd, we can reverse the order of the element array to achieve the drag and drop sorting effect of elements.

export default {
  methods: {
    onDragEnd(event) {
      let items = this.items;
      let oldIndex = event.oldIndex;
      let newIndex = event.newIndex;
      if (newIndex >= items.length) {
        let k = newIndex - items.length;
        while ((k--) + 1) {
          items.push(undefined);
        }
      }
      items.splice(newIndex, 0, items.splice(oldIndex, 1)[0]);
    }
  }
}

In the above code, we first get the array, old index and new index of the element. Then, we use the splice() method to move the position of the elements and reverse the order of the element array to achieve the effect of drag and drop sorting.

Effects of drag-and-drop sorting function

Using the drag-and-drop sorting function provided in the Vue documentation, various useful sorting operations can be achieved. For example, you can drag a group of images onto the page in a specific order, then use drag-and-drop sorting to easily adjust their position and order. You can also use this feature to sort your drag-and-drop task list so that you can list all your unfinished tasks together at once.

In addition to adjusting the visible order of visual elements, the drag-and-drop sort function can also be used to sort functional elements. For example, in a Vue-based application, you can create a sortable list of tasks, where each task has an independent status, due date, and other properties. Through the drag-and-drop sorting operation, users can easily modify the order of tasks and the relationship between tasks to better manage the task list.

Conclusion

In Vue documents, drag-and-drop sorting functions can be used to easily implement various sorting operations. This is useful for all types of applications, including task management, checklists, and images. By using drag-and-drop sorting functions with Vue built-in directives and event handlers, we can achieve great sorting effects and easily adjust the position and order of elements.