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问题描述：

需求是需要一个级联选择框，选择框有一定的高度，当选项比较长的时候，回显数据可以在选择框中不被隐藏，换行显示。el-cascader组件如下，满足不了需求，采用封装组件的方法来实现。

改后效果：

回显数据效果：

代码如下：

1、自定义组件CascaderTextarea.vue

<template><div class="cascader-textarea-wrapper"><!-- 隐藏原生输入框的级联选择器 --><el-cascaderv-model="displayText":options="options":props="props"@change="handleChange"ref="cascaderRef"class="hidden-cascader":value="materialName"/><!-- 自定义文本区域 --><textareav-model="materialName"class="custom-textarea"placeholder="请选择"@focus="handleFocus"@click="handleClick"@input="handleSearch"rows="3"></textarea></div></template><script>export default {model: {prop: 'materialName',event: 'change'},props: {materialName: {type: String,default: ''},// 接收父组件传递的选项数据options: {type: Array,required: true},// 级联选择器配置项（可选）cascaderProps: {type: Object,default: () => ({})}},data() {return {selectedValue: [],       // 存储实际选择的路径值displayText: '',         // 文本区域显示的内容props: {expandTrigger: 'hover',emitPath: true,        // 返回完整路径...this.cascaderProps  // 合并父组件传递的配置},filteredOptions: [],optionsCopy:[],};},methods: {handleSearch() {if(this.materialName==''){this.$emit('change', this.materialName)this.options=this.optionsCopy;}if (!this.materialName) {this.filteredOptions = [];return;}this.options = this.flattenOptions(this.options).filter(option => option.label.includes(this.materialName));},flattenOptions(options, parent = null) {return options.reduce((acc, option) => {const flatOption = {...option,parent};if (option.children) {return [...acc,flatOption,...this.flattenOptions(option.children, option)];}return [...acc, flatOption];}, []);},// 处理值变化（同步显示文本）handleChange(value) {if (!value || value.length === 0) {this.displayText = '';return;}// 获取选中节点的标签路径const node = this.$refs.cascaderRef.getCheckedNodes()[0];if (node) {this.displayText = node.pathLabels[ node.pathLabels.length - 1];}this.$emit('change', this.displayText)},// 聚焦时展开下拉框handleFocus() {if(this.optionsCopy.length==0){var objStr= JSON.stringify(this.options);this.optionsCopy=JSON.parse(objStr);}this.$refs.cascaderRef.toggleDropDownVisible(true);},// 点击时展开下拉框handleClick() {if(this.optionsCopy.length==0){var objStr= JSON.stringify(this.options);this.optionsCopy=JSON.parse(objStr);}this.$refs.cascaderRef.toggleDropDownVisible(true);},},};</script><style scoped>.cascader-textarea-wrapper {position: relative;}/* 隐藏原生输入框 */.hidden-cascader {position: absolute;opacity: 0;pointer-events: none;}/* 自定义文本区域样式 */.custom-textarea {width: 100%;padding: 8px 15px;border: 1px solid #dcdfe6;border-radius: 4px;resize: vertical;font-family: inherit;font-size: 14px;transition: border-color 0.2s;min-height: 80px;height: 200px;text-align: center;}.custom-textarea:focus {outline: none;border-color: #409eff;}</style>

2、测试页面

<template><div><div class="container"><cascader-textarea :options="cascaderOptions":cascader-props="{ label: 'name', value: 'value' }"v-model="materialName"/></div></div>
</template><script>
import CascaderTextarea from './CascaderTextarea.vue';export default {components: { CascaderTextarea },data() {return {materialName:'五月五，粽叶香，愿您的生活如糯米般甜糯，如红枣般红火！端午安康，岁岁平安，百事‘粽’顺，幸福‘粽’在身边',cascaderOptions: [{value: 1,name: '东南',children: [{ value: 11, name: '五月五，粽叶香，愿您的生活如糯米般甜糯，如红枣般红火！端午安康，岁岁平安，百事‘粽’顺，幸福‘粽’在身边' },{ value: 12, name: '艾草青青挂门楣，龙舟竞渡逐浪飞。愿君端午享安康，吉祥如意永相随。记得吃粽佩香囊，千年习俗暖心扉' }]},{value: 2,name: '华南',children: [{ value: 21, name: '广东' },{ value: 22, name: '海南' }]}]};},methods: {}};
</script>
<style scoped>/deep/ .classRed .custom-textarea{background-color: #00FFFF;}.container{margin: auto;width: 10%;margin-top: 10%;height: 300px;
}</style>