如何有效过滤保留其现有结构的树形视图?
我有一个树状的JSON,应该对其进行过滤,并且结果应保留该树状结构。
var tree = [ {
text: "Parent 1",
nodes: [
{
text: "Child 1",
type: "Child",
nodes: [
{
text: "Grandchild 1"
type: "Grandchild"
},
{
text: "Grandchild 2"
type: "Grandchild"
}
]
},
{
text: "Child 2",
type: "Child"
}
]
},
{
text: "Parent 2",
type: "Parent"
},
{
text: "Parent 3",
type: "Parent"
}
];
范例:
1)如果搜索查询是父级1
预期结果 :
[ {
text: "Parent 1",
nodes: [
{
text: "Child 1",
type: "Child",
nodes: [
{
text: "Grandchild 1"
type: "Grandchild"
},
{
text: "Grandchild 2"
type: "Grandchild"
}
]
},
{
text: "Child 2",
type: "Child"
}
]
}
]
2)如果搜索查询是Child 1
预期结果 :
[ {
text: "Parent 1",
nodes: [
{
text: "Child 1",
type: "Child",
nodes: [
{
text: "Grandchild 1"
type: "Grandchild"
},
{
text: "Grandchild 2"
type: "Grandchild"
}
]
}
]
}
]
3)如果搜索查询是孙子2
预期结果 :
[ {
text: "Parent 1",
nodes: [
{
text: "Child 1",
type: "Child",
nodes: [
{
text: "Grandchild 2"
type: "Grandchild"
}
]
}
]
}
]
我需要根据节点的水平(以保持树形结构 在这里)。到目前为止,我已尝试递归过滤,但无法重新映射结果。
angular.module("myApp",[]) .filter("filterTree",function(){
return function(items,id){
var filtered = [];
var recursiveFilter = function(items,id){
angular.forEach(items,function(item){
if(item.text.toLowerCase().indexOf(id)!=-1){
filtered.push(item);
}
if(angular.isArray(item.items) && item.items.length > 0){
recursiveFilter(item.items,id);
}
});
};
recursiveFilter(items,id);
return filtered;
};
});
});
我的JSON非常大,因此基于类型的重新映射应在过滤器本身中完成。请指教。
回答:
您可以使用嵌套递归方法并过滤树,同时尊重找到的项目。
function filter(array, text) { const getNodes = (result, object) => {
if (object.text === text) {
result.push(object);
return result;
}
if (Array.isArray(object.nodes)) {
const nodes = object.nodes.reduce(getNodes, []);
if (nodes.length) result.push({ ...object, nodes });
}
return result;
};
return array.reduce(getNodes, []);
}
var tree = [{ text: "Parent 1", nodes: [{ text: "Child 1", type: "Child", nodes: [{ text: "Grandchild 1", type: "Grandchild" }, { text: "Grandchild 2", type: "Grandchild" }] }, { text: "Child 2", type: "Child" }] }, { text: "Parent 2", type: "Parent" }, { text: "Parent 3", type: "Parent" }];
console.log(filter(tree, 'Parent 1'));
console.log(filter(tree, 'Child 1'));
console.log(filter(tree, 'Grandchild 2'));
.as-console-wrapper { max-height: 100% !important; top: 0; }
以上是 如何有效过滤保留其现有结构的树形视图? 的全部内容, 来源链接: utcz.com/qa/413436.html