vue2 web多标签输入框elinput是否当前焦点详解

<template>
    <div class="tags-view" @click="beginInput">
        <el-tag :key="index" v-for="(tag, index) in dynamicTags" closable :disable-transitions="false"
            @close="handleClose(index)">
            {{ tag }}
        </el-tag>
        <el-input v-if="inputVisible" class="input-new-tag" style="width: 100%;" v-model="inputValue" ref="saveTagInput"
            size="small" @keyup.enter.native="handleInputConfirm" @blur="handleInputConfirm">
        </el-input>
        <!-- <el-button v-else class="button-new-tag" size="small" @click="showInput">+</el-button> -->
    </div>
</template>

<script>
export default {
    name: 'inputTag',
    props: {
        tags: {
            type: Array,
            default: []
        },
    },
    watch: {
        tags: {
            deep: true,
            immediate: true,
            handler(val) {
                this.dynamicTags = val || []
            }
        }
    },
    data() {
        return {
            dynamicTags: [],
            inputVisible: false,
            inputValue: ''
        };
    },
    methods: {
        handleClose(index) {
            this.dynamicTags.splice(index, 1);
        },
        showInput() {
            this.inputVisible = true;
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        beginInput() {
            this.showInput();
        },
        handleInputConfirm() {
            let inputValue = this.inputValue;
            if (inputValue) {
                this.dynamicTags.push(inputValue);
            }
            const inputElement = this.$refs.saveTagInput.$refs.input; // 获取input DOM元素
            const isFocused = document.activeElement === inputElement; // 判断是否为当前焦点
            this.inputVisible = isFocused;
            
            this.inputValue = '';
            this.$emit('changed', this.dynamicTags)
        }
    }
}
</script>


<style lang="scss" scoped>
.tags-view {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;

    min-height: 32px;
    padding: 4px 5px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
}

.button-new-tag {
    margin-left: 10px;
    height: 24px;
    line-height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}

.input-new-tag {
    height: 24px;
    line-height: 24px;
    width: 90px;
    //margin-left: 10px;
    vertical-align: bottom;
}

::v-deep {
    .el-tag {
        margin-left: 5px;
        margin-top: 2px;
        margin-bottom: 2px;
    }

    .el-input__inner {
        height: 24px;
        line-height: 24px;

        border: none;
        padding: 0px 5px;
    }
}
</style>

import InputTag from '../components/inputTag.vue'

<InputTag class="w-100" :tags="tagsValue" @changed="tagsChanged"></InputTag>

handleInputConfirm() {
    let inputValue = this.inputValue;
    if (inputValue) {
        this.dynamicTags.push(inputValue);
    }
    const inputElement = this.$refs.saveTagInput.$refs.input; // 获取input DOM元素
    const isFocused = document.activeElement === inputElement; // 判断是否为当前焦点
    this.inputVisible = isFocused;
    
    this.inputValue = '';
    this.$emit('changed', this.dynamicTags)
}