How to use list tags in Vue to implement double-click editing function

Vue is a very popular JavaScript framework that allows developers to quickly build interactive interfaces. Among them, Vue provides many practical components and instructions, such as list tags, to make development work more convenient. In actual development, we usually need to implement interactive operations such as editing and deletion in the list. This article will introduce how to use list tags in Vue to implement double-click editing functionality.

1. List tag

In Vue, we can use the v-for directive to render the list, for example:

<div v-for="(item, index) in items">{{item}}</div>

Here, items is an array, and the v-for directive will render each element in the array as a <div> element. We can also use the v-bind:key directive to specify a unique identifier for each element, for example:

<div v-for="(item, index) in items" v-bind:key="item.id">{{item.name}}</div>

Here, it is assumed that each element has a unique id attribute, we can use the v-bind:key directive to specify.

2. Implement double-click editing

In the list, it is usually necessary to implement editing operations. In Vue, we can use double-click events to trigger editing operations. First, we can add a @dblclick event listener for each element in v-for, for example:

<div v-for="(item, index) in items" v-bind:key="item.id" @dblclick="editItem(index)">
  {{item.name}}
</div>

Here, when an element is double-clicked , the editItem method will be triggered and the index of the element in the array will be passed. The editItem method can realize the operation of opening the edit box, for example:

methods: {
  editItem(index) {
    this.editingIndex = index;  // 设置当前编辑元素的索引
    this.editingValue = this.items[index].name;  // 设置当前编辑元素的值
  }
}

In the above code, editingIndex and editingValue respectively indicate that the current The index and value of the edited element. Through the double-click event, we can save the index and value of the currently edited element.

Next, we need to display and hide the edit box. We can use a flag showEditingField to indicate whether the edit box should be displayed, for example:

<div v-for="(item, index) in items" v-bind:key="item.id" @dblclick="editItem(index)">
  <div v-if="index !== editingIndex">{{item.name}}</div>
  <div v-else>
    <input type="text" v-model="editingValue">
    <button @click="saveItem">保存</button>
    <button @click="cancelEdit">取消</button>
  </div>
</div>

Here, we use the v-if directive based on the index of the current element and Edit status to control display content. If the current element is not the element being edited, the original value of the element is displayed; otherwise, an input box and save and cancel buttons are displayed.

When the user clicks the save button, we can perform the save operation and reset the editing state. The save operation can update the value of the corresponding element in the array, for example:

methods: {
  saveItem() {
    this.items[this.editingIndex].name = this.editingValue;
    this.editingIndex = -1;
    this.editingValue = "";
  },
  cancelEdit() {
    this.editingIndex = -1;
    this.editingValue = "";
  }
}

Here, we use this.items[this.editingIndex].name = this.editingValue to update the corresponding element in the array value, set editingIndex and editingValue to -1 and the empty string respectively to reset the editing state.

3. Summary

In this article, we introduced how to use the list tag in Vue to implement the double-click editing function. Render the list through v-for, use the double-click event listener to open the edit box, use the v-if command to control the display content according to the editing status of the element, and use the flag bit to control editing Showing and hiding boxes. This article only provides an implementation idea, and the specific implementation method may vary depending on project requirements.

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