我有一个角色对象,我希望使用PrimeNG映射到TreeNode对象以在树中显示它。 角色对象是这样的(如图所示)
role: [
id: ....
name: ....
description: ....
roles[]: .....
]
树节点对象具有以下结构:
{
"data":
[
{
"label": "Documents",
"data": "Documents Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{
"label": "Work",
"data": "Work Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{"label": "Expenses.doc", "icon": "fa-file-word-o", "data": "Expenses Document"}, {"label": "Resume.doc", "icon": "fa-file-word-o", "data": "Resume Document"}]
},
{
"label": "Home",
"data": "Home Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{"label": "Invoices.txt", "icon": "fa-file-word-o", "data": "Invoices for this month"}]
}]
},
{
"label": "Pictures",
"data": "Pictures Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [
{"label": "barcelona.jpg", "icon": "fa-file-image-o", "data": "Barcelona Photo"},
{"label": "logo.jpg", "icon": "fa-file-image-o", "data": "PrimeFaces Logo"},
{"label": "primeui.png", "icon": "fa-file-image-o", "data": "PrimeUI Logo"}]
},
{
"label": "Movies",
"data": "Movies Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{
"label": "Al Pacino",
"data": "Pacino Movies",
"children": [{"label": "Scarface", "icon": "fa-file-video-o", "data": "Scarface Movie"}, {"label": "Serpico", "icon": "fa-file-video-o", "data": "Serpico Movie"}]
},
{
"label": "Robert De Niro",
"data": "De Niro Movies",
"children": [{"label": "Goodfellas", "icon": "fa-file-video-o", "data": "Goodfellas Movie"}, {"label": "Untouchables", "icon": "fa-file-video-o", "data": "Untouchables Movie"}]
}]
}
]
}
data.roles.forEach((role, index) => {
//this.roleTree.label = role.Name;
//this.roleTree.data = role.ID;
let treeNode: TreeNode = {
label: role.Name,
data: role
}
this.treeNodes.push(treeNode);
console.log(role);
console.log(index);
});
但是当我尝试角色时,这段代码似乎太复杂了。在'角色'映射到“孩子们”#39;在treeNode中。我见过一些像this这样的例子,但它映射的是相同的字段名称。
我是Typesript的新手,是否有一种解决方法可以将带有子项的角色对象转换为带有子项的treeNode,方法是指定要映射到' label'标签的字段名称(例如名称)。角色?
代码示例将受到高度赞赏。
答案 0 :(得分:5)
好吧,我对您正在使用的Role
和TreeNode
类型不是100%肯定。根据您问题中的代码,我的猜测就在这里。
Role
有一些你关心的属性,但棘手的是roles
属性,我猜测它是一个Role
个对象的数组:
interface Role {
id: string;
name: string;
description: string;
roles: Role[];
}
同样,TreeNode
有一些属性,但棘手的是children
属性,它是TreeNode
个对象的数组。此外,我假设TreeNode
在data
的类型中是通用的,在这种情况下,您想要TreeNode<Role>
,这意味着data
属性将是一个Role
对象:
interface TreeNode<T> {
label: string;
data: T;
expandedIcon?: string;
collapsedIcon?: string;
children: TreeNode<T>[];
}
如果那些正确,那么您可以使用以下roleToTreeNode()
函数将Role
对象映射到TreeNode<Role>
对象:
function roleToTreeNode(role: Role): TreeNode<Role> {
return {
label: role.name,
data: role,
children: role.roles.map(roleToTreeNode)
};
}
children:
行是函数的有效部分:您正在使用role.roles
数组,并将每个Role
元素映射到TreeNode<Role>
,这就是roleToTreeNode()
函数可以。也就是说,roleToTreeNode()
是一个自我调用的递归函数。
这有意义吗?希望有所帮助。祝你好运!