树多选搜索查询，搜索后选中状态仍保留

<template><div class="half-transfer"><div class="el-transfer-panel"><div><el-checkbox v-model="selectAll" @change="handleSelectAll">全部</el-checkbox></div><el-input v-model="searchInput" placeholder="请输入搜索内容" clearable @clear="clearSearch"></el-input><div class="el-transfer__list"><el-treeref="treeRef":data="treeData"node-key="key":default-expand-all="true"show-checkbox:default-checked-keys="checkedKeys":filter-node-method="filterNode"@check="handleCheckChange"></el-tree></div></div></div>
</template><script setup>
import { ref, reactive, watch, nextTick } from 'vue';
import { ElTree, ElCheckbox, ElInput } from 'element-plus';const searchInput = ref('');
const checkedKeys = ref([]);
const treeData = reactive([{key: 1,label: '选项1',children: [{ key: 11, label: '子选项11' },{ key: 12, label: '子选项12' },{ key: 13, label: '子选项13' },],},{key: 2,label: '选项2',children: [{ key: 21, label: '子选项21' },{ key: 22, label: '子选项22' },{ key: 23, label: '子选项23' },],},
]);
const selectAll = ref(false);
const treeRef = ref(null);watch(searchInput, (val) => {treeRef.value.filter(val);
});const filterNode = (value, data) => {if (!value) return true;return data.label.includes(value);
};const clearSearch = () => {searchInput.value = '';
};const handleSelectAll = (checked) => {if (checked) {checkedKeys.value = getAllNodeKeys();} else {checkedKeys.value = [];treeRef.value.setCheckedKeys([]);}
};const getAllNodeKeys = () => {const keys = [];const traverse = (nodes) => {for (const node of nodes) {keys.push(node.key);if (node.children && node.children.length > 0) {traverse(node.children);}}};traverse(treeData);return keys;
};const handleCheckChange = (data) => {checkedKeys.value = data.checkedKeys;// 获取树节点选中的idconsole.log(treeRef.value.getCheckedKeys())nextTick(() => {if (treeRef.value) {const nodes = treeRef.value.root.childNodes;const allChecked = nodes.every((node) => node.checked);selectAll.value = allChecked;}});
};
</script><style scoped>
.half-transfer {margin-top: 20px;margin-left: 20px;width: 335px;height: 260px;background: #fff;padding: 20px;border: 1px solid #dcdfe6;border-radius: 4px;
}.el-transfer-panel {display: flex;flex-direction: column;height: 100%;
}.el-transfer__list {overflow-y: auto;border-radius: 4px;margin-top: 8px;
}.el-transfer__list .el-checkbox-group {padding: 10px;
}.el-transfer__list .el-checkbox {display: block;margin-bottom: 5px;line-height: 24px;
}.el-transfer__list .el-checkbox:last-child {margin-bottom: 0;
}.el-transfer__list .el-scrollbar {background-color: #f5f7fa;
}
</style>