假设我有一个由PrimeNg为Angular2提供的树表。如何在代码中扩展特定节点(例如onNodeSelect
回调)?
我想 OP 不再需要答案,但对于任何到达这里但找不到答案的人——
有一个属性expanded
用于TreeNode
,您需要做的就是将其设置为true
selectedNode.expanded=true;
如果您希望显示所有展开的树,只需遍历 TreeNode 并在每个节点上设置展开。 这将与此类似
expandChildren(node:TreeNode){
if(node.children){
node.expanded=true;
for(let cn of node.children){
this.expandChildren(cn);
}
}
}
执行prajeesh kumar提到的代码后,要刷新树表,请添加以下代码行:
this.treeNodeData = [...this.treeNodeData];
你可以像这样调用 expandChildren() 方法:
expandTreeNodes() {
if (this.treeNodeData) {
this.treeNodeData.forEach(x => this.expandChildren(x));
// Below line is important as it would refresh the TreeTable data,
// which would force automatic update of nodes and since expanded
// has been set to true on the expandChildren() method.
this.treeNodeData = [...this.treeNodeData ];
}
}
使用上面,我刚刚编写了用于扩展/折叠整个可处理节点的函数。
在我的模板中,我将整个树表 json 传递给 exapandORcollapse
<button type="button" (click)="exapandORcollapse(basicTreeTable)">Collapse /Expand all</button>
<p-treeTable [value]="basicTreeTable" selectionMode="single" [(selection)]="selectedPortfolio" (onNodeSelect)="nodeSelect($event)"
(onNodeUnselect)="nodeUnselect($event)" (onRowDblclick)="onRowDblclick($event)" scrollable="true">
在我的组件.ts文件中
exapandORcollapse(nodes) {
for(let node of nodes)
{
if (node.children) {
if(node.expanded == true)
node.expanded = false;
else
node.expanded = true;
for (let cn of node.children) {
this.exapandORcollapse(node.children);
}
}
}
}
我做了同样的事情,但我将相同的树对象克隆到自身并且它起作用了。
this.treeData.forEach((node) => {this.expandRecursive(node, true);});
this.treeData = _.cloneDeep(this.treeData);