Click to cancel the vue input box label

In Vue development, the input box is a very important component. In many cases, we need to customize the input box to achieve a better user experience. One of the common requirements is to add labels to input boxes. Tags play a very good prompt and classification function in the input box. Users can quickly find the information they need based on tags, thus improving usage efficiency. However, when we add tags to the input box, we often encounter a problem - how to cancel the added tags. Today, we will discuss this issue.

1. How to implement the function of adding tags

In Vue, we can obtain user input through the v-model instruction. That is, by getting the value of v-model, we can get the text entered by the user. Therefore, in a simple input box, we can complete the input function by binding v-model. Suppose we now need to add a label to the input box. We can add the label as an independent component and combine the input box and label components. The following is a sample code for a simple implementation:

<template>
  <div>
    <label>名称：</label>
    <input type="text" v-model="name">
    <tags :value="tags" @change="handleTagsChange" />
  </div>
</template>

<script>
import Tags from './Tags.vue'

export default {
  components: { Tags },
  data () {
    return {
      name: '',
      tags: []
    }
  },
  methods: {
    handleTagsChange (tags) {
      this.tags = tags
    }
  }
}
</script>

In this code, we define a component named "Tags". This component is a label component, responsible for managing all labels. We also defined an input box with the v-model directive and combined the label component with the input box. After the user enters text, we can listen to the change event of the label component and manage the label. In this way, we can add labels to the input box.

2. How to add a "Cancel" button on a label

In the process of adding a label, we may encounter a situation: the user mistakenly operates, or adds a wrong label . In this case, the user will most likely need to cancel the tag. Therefore, adding a "Cancel" button to the right of the label is a good option. So, how to implement this function?

We can add a delete event to the label component. When the user clicks the "Cancel" button, this event is triggered and the current label is deleted from the component. Here is a simple sample code:

<template>
  <span class="tag with-cancel" v-for="(tag, index) in tags">
    {{ tag }}
    <button class="delete" @click="deleteTag(index)">X</button>
  </span>
</template>

<script>
export default {
  props: ['value'],
  data () {
    return {
      tags: this.value.slice()
    }
  },
  methods: {
    deleteTag (index) {
      this.tags.splice(index, 1)
      this.$emit('change', this.tags)
    }
  }
}
</script>

In this code, we add a style to the label component that waits for the delete event, and also adds a "Cancel" button to each label. When the button is clicked, we delete the current tag by calling the deleteTag method and trigger the change event through the $emit method.

3. How to deal with problems when canceling tags

After implementing the "cancel" function of tags, we need to consider how to solve some problems caused by deleting tags. For example, when the user deletes a label, the entire input box content may be deleted. At this time, we need to reposition the cursor to the correct position.

In order to solve this problem, we need to get the cursor position of the input box before and after deletion when deleting the label, and then move the cursor to the correct position after deleting the label. The following is a simple sample code:

deleteTag (index) {
  const input = this.$refs.input
  const startPos = input.selectionStart
  const endPos = input.selectionEnd
  this.tags.splice(index, 1)
  this.$nextTick(() => {
    const delta = startPos - endPos
    input.selectionStart = startPos - delta
    input.selectionEnd = endPos - delta
    this.$emit('change', this.tags)
  })
}

In this code, we obtain the position of the cursor before deletion by obtaining the selectionStart and selectionEnd properties of the input box. We then move the cursor to the correct location after deleting the label. What needs to be noted here is that we cannot directly manipulate DOM elements in the method, otherwise some errors will occur. Therefore, we use the $nextTick method to update the DOM element after the next update of the component is completed.

Summary

In Vue, the input box is a very commonly used component. In order to improve user experience, we often need to add a label to the input box and add a label "Cancel" button. When implementing this function, we need to pay attention to some details, such as handling the cursor position. Only by thinking carefully can we make our input box more perfect.

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