[英]Remove selected node from Tree
我正在使用angular-tree-component( https://angular2-tree.readme.io )在Angular2應用程序中顯示一棵樹。
我需要使用戶能夠選擇樹中的任何節點並將其刪除。 這應該刪除選定的節點及其所有子節點(如果是葉節點,則只是該節點)。 用戶完成后,修剪后的樹將發送到服務器並保存在服務器中。
在下面的示例中,用戶選擇“節點1-2”,然后單擊“刪除”。 這將從視圖和已更新的底層Javascript對象中刪除“節點1-2,節點1”和“節點2”。 然后,用戶可以單擊另一個按鈕(例如,保存)以將更新的對象保存在服務器上。
為了做到這一點,我編寫了以下代碼,單擊“刪除”按鈕即可調用該代碼。 我存儲選定節點的ID,然后遍歷整個樹以找到該ID。 當id匹配時,我使用'delete'關鍵字刪除'id'和'text'。 但是,“刪除兒童”無效。
deleteSelectedNode() {
//Get the node which was selected by the user
let nodeToDelete: TreeNode = this.myService.getActiveNode();
//id will be unique, can be used to identify the node
let idToDelete = nodeToDelete.data.id;
this.traverseTree(this.nodes[0], idToDelete);
}
traverseTree(obj, idToDelete: string) {
for (var k in obj) {
if (typeof obj[k] == "object" && obj[k] !== null) {
this.traverseTree(obj[k], idToDelete);
}
else {
if (k === 'id') {
let id = obj[k];
if (id === idToDelete) {
console.log('ID Matched ' + id);
delete obj['id'];
delete obj['text'];
delete obj['children'];
break;
}
}
}
}
}
下面是呈現樹的JSON。
{
"children": [
{
"children": [
{
"text": "Node 1",
"id": "A493"
},
{
"text": "Node 2",
"id": "A494"
}
],
"text": "Node 1-2",
"id": "A491"
},
{
"children": [
{
"children": [
{
"text": "Node 3",
"id": "A5ab"
},
{
"text": "Node 4",
"id": "A5ac"
},
{
"text": "Node 5",
"id": "A5ad"
},
{
"text": "Node 6",
"id": "A5ae"
},
{
"text": "Node 7",
"id": "A5af"
},
{
"text": "Node 8",
"id": "A5b0"
},
{
"text": "Node 9",
"id": "A5b1"
},
{
"text": "Node 10",
"id": "A5b2"
},
{
"text": "Node 11",
"id": "A5b3"
},
{
"text": "Node 12",
"id": "A5b4"
},
{
"text": "Node 13",
"id": "A6da"
},
{
"text": "Node 14",
"id": "A6db"
}
],
"text": "Node 1-14",
"id": "A495"
},
{
"children": [
{
"text": "Node 15",
"id": "A6dc"
},
{
"text": "Node 16",
"id": "A6dd"
},
{
"text": "Node 17",
"id": "A6de"
},
{
"text": "Node 18",
"id": "A6df"
},
{
"text": "Node 19",
"id": "A6e0"
},
{
"text": "Node 20",
"id": "A6e1"
},
{
"text": "Node 21",
"id": "A6e2"
},
{
"text": "Node 22",
"id": "A6e3"
}
],
"text": "Node 15-22",
"id": "A496"
},
{
"text": "Node 23",
"id": "A497"
},
{
"text": "Node 24",
"id": "A498"
}
],
"text": "Node 23-24",
"id": "A492"
}
],
"text": "Node 1-24",
"id": "A490"
}
如何刪除整個節點,包括子節點? 另外,有沒有更好的方法可以做到這一點?
您可以通過父級引用輕松完成
deleteNode() {
let nodeToDelete: TreeNode = this.tree.treeModel.getActiveNode();
if (nodeToDelete.level === 1) {
this.nodes = this.nodes.filter((n) => n.id !== nodeToDelete.id);
} else {
nodeToDelete.parent.children = nodeToDelete.parent.children.filter((n) => n.id !== nodeToDelete.id);
}
}
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