如何创建多级下拉列表并与来自服务器的数据绑定

15

我是Angular的新手。我在Angular上有一些工作。

我需要Json通过调用Rest Api为来自服务器的数据绑定嵌套下拉列表。

数据具有一个属性LgLevel，指定组层次结构中的级别。家长会level=0，即时Child=1，Grandchild=2等等。Child并Grandchild具有ParentLocationGroup字段，该字段显示在哪个父菜单，子菜单中。

这是我的json数据。我有大量数据，但没有全部显示。

{
"ArrayOfLocationGroup": {
  "LocationGroup": [
     {
        "Id": "628",
        "Name": "TEST1",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources"
        },
        "ParentLocationGroup": {
           "_uuid": "bdce4396-9c60-4831-90f2-6f793becb362",
           "__text": "570"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "0"
        }
     },
     {
        "Id": "630",
        "Name": "TEST2",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "PAM-TEST"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "631",
        "Name": "TEST3",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "PAA-TEST"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "697",
        "Name": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "TEST4"
        },
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "PAE-TEST"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "700",
        "Name": "TEST5",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "cuba"
        },
        "ParentLocationGroup": {
           "_uuid": "704af4cf-9feb-4f1b-aa00-d1c7926f7901",
           "__text": "694"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "2"
        }
     },
     {
        "Id": "706",
        "Name": "TEST5",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "VOIP-Test"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "718",
        "Name": "TEST7",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "719",
        "Name": "TEST8",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "MEM_RS"
        },
        "ParentLocationGroup": {
           "_uuid": "52073e2b-48b5-41a9-9c2b-d793835cf285",
           "__text": "718"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "2"
        }
     },
     {
        "Id": "752",
        "Name": "TEST9",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "ELDIT"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "753",
        "Name": "TEST10",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "GXYA"
        },
        "ParentLocationGroup": {
           "_uuid": "52073e2b-48b5-41a9-9c2b-d793835cf285",
           "__text": "718"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "2"
        }
     },
     {
        "Id": "760",
        "Name": "TEST11",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "STAGE2"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "761",
        "Name": "TEST12",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "INIT"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     },
     {
        "Id": "762",
        "Name": "TEST13",
        "GroupId": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "USIT"
        },
        "ParentLocationGroup": {
           "_uuid": "894055b6-b132-4dc2-a12a-971ecc0c7224",
           "__text": "628"
        },
        "LgLevel": {
           "_xmlns": "http://www.air-watch.com/servicemodel/resources",
           "__text": "1"
        }
     }
  ],
  "_xmlns:xsd": "http://www.w3.org/2001/XMLSchema"
}
}

我已经尝试过开发它，但是我发现bootstrap在html文件和单独CSS文件中使用静态数据的所有示例对我来说都很复杂。

我想使用动态地做到这一点TypeScript。我该如何开始工作。

html  angular  typescript 
— 阿文德·乔拉斯亚
source
首先，数据格式为XML和JSON。您还可以添加尝试过的内容吗？也许更详细地说明您采用的方法。
— vatz88
@ vatz88-是的，这是刚从邮递员粘贴的xml。我尝试了html具有静态嵌套列表的代码。我将尝试对其进行编辑并发布Json数据。你不会喜欢我尝试过的:)
— Arvind Chourasiya
您不必担心到目前为止编写的代码。方法是-根据您必须呈现下拉列表的数据，在ts文件中的html绑定中对数据进行硬编码。一旦该逻辑正确，就可以动态获取数据，然后让绑定工作变得神奇。
— vatz88
@ vatz88-我的静态代码在html文件中。我有启动它的想法。你可以帮我
— Arvind Chourasiya
@ArvindChourasiya有很多LgLevel 1的孩子，如何识别LgLevel 2的哪个孙子属于哪个孩子？
— Satish Pai

Answers:

4

这是一个示例编码，您需要根据json数据中的嵌套级别数据进行编码。现在，您可以使用模型数据在DOM中循环格式化格式化的 json 数据。我希望这会帮助您创建一个多级下拉菜单

groupBy(xs, key) {
   return xs.reduce(function (rv, x) {
     (rv[x[key]] = rv[x[key]] || []).push(x);
    return rv;
   }, {});
 }

var model;

getData() {
 var   sampleData = {
  "ArrayOfLocationGroup": {
    "LocationGroup": [
      ...
      ...//Server response data
      ],
    "_xmlns:xsd": "http://www.w3.org/2001/XMLSchema"
  }
 }    

var list = this.sampleData["ArrayOfLocationGroup"]["LocationGroup"];
var formattedList = [];

list.forEach(element => {

  var obj = {  //Make sure your server response data to like this structure
    "Id": element.Id,
    "Name": element.Name,
    "GroupId": element.GroupId.__text,
    "ParentLocationGroup": element.ParentLocationGroup.__text,
    "LgLevel": element.LgLevel.__text,
    "Child" : []
  }
  formattedList.push(obj);
});

var groupDataList = this.groupBy(formattedList, "LgLevel");

var parents = groupDataList[0];
var child = groupDataList[1];
var childOfChild = groupDataList[2];

child.forEach(c => {
  c.Child = childOfChild.filter(x => x.ParentLocationGroup == c.Id);
})

parents.forEach(p => {
  p.Child = child.filter(x => x.ParentLocationGroup == p.Id);
})

this.model = parents;
}

HTML文件

    <ul class="nav site-nav">
     <li class=flyout>
      <a href=#>Dropdown</a>
      <!-- Flyout -->
      <ul class="flyout-content nav stacked">
        <li *ngFor="let parent of model" [class.flyout-alt]="parent.Child.length > 0"><a href=#>{{parent.Name}}</a>
          <ul *ngIf="parent.Child.length > 0" class="flyout-content nav stacked">
            <li *ngFor="let c of parent.Child" [class.flyout-alt]="c.Child.length > 0"><a href=#>{{c.Name}}</a>
              <ul *ngIf="c.Child.length > 0" class="flyout-content nav stacked">
                <li *ngFor="let cc of c.Child" [class.flyout-alt]="cc.Child.length > 0"><a href=#>{{cc.Name}}</a></li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
    </li>
  </ul>

根据您的服务器响应数据，组织模型数据。 响应json格式已更改（__text到#text）

 var obj = {
    "Id": element.Id,
    "Name": element.Name && element.Name.#text ? element.Name.#text : element.Name,
    "GroupId": element.GroupId && element.GroupId.#text ? element.GroupId.#text : element.GroupId,
    "ParentLocationGroup": element.ParentLocationGroup && element.ParentLocationGroup.#text ? element.ParentLocationGroup.#text : element.ParentLocationGroup,
    "LgLevel": element.LgLevel && element.LgLevel.#text ? element.LgLevel.#text : element.LgLevel,
    "Child" : []
  }
— 亚瑟
source
您也可以张贴.html文件吗？
— Arvind Chourasiya
@ArvindChourasiya您需要选择标签下拉列表还是仅下拉列表（链接）？
— Yaseer
我需要它显示在上面链接的dolor选项中。
— Arvind Chourasiya
@ArvindChourasiya我使用html更新了帖子
— Yaseer
我对您的代码有点困惑。您不在getData任何地方使用。您能否检查一下代码一并添加开头和结尾。
— Arvind Chourasiya
4

看来您已经有了另一个满足您要求的答案。但是这个解决方案花了我一些时间来提出。因此决定无论如何将其发布。

以下代码段用于构造父子层次数据的树状结构：

  processData(data) {
    let locationData = data.ArrayOfLocationGroup.LocationGroup;
    let level0 = [];
    let tempMap = {};
    for (let i = 0; i < locationData.length; i++) {
      let currItem = this.getDataObject(locationData[i]);
      if (tempMap[currItem.id] == undefined) {
        tempMap[currItem.id] = currItem;
        if (tempMap[currItem.parentLocationGroup] == undefined) {
          tempMap[currItem.parentLocationGroup] = { children: [] };
        }
        tempMap[currItem.parentLocationGroup].children.push(currItem);
      } else {
        if (tempMap[currItem.id]) {
          currItem.children = tempMap[currItem.id].children;
        }
        tempMap[currItem.id] = currItem;
        if (tempMap[currItem.parentLocationGroup] == undefined) {
          tempMap[currItem.parentLocationGroup] = { children: [] };
        }
        tempMap[currItem.parentLocationGroup].children.push(currItem);
      }
      if (currItem.lgLevel == "0") {
        if (level0.indexOf(currItem) == -1) {
          level0.push(currItem);
        }
      }
    }
    this.levelData = level0;
  }

聚集的数据作为输入传递到dropdown组件，该组件将其呈现为多级下拉菜单。

该解决方案据说适用于任何级别的儿童。dropdown可以修改该组件，以根据您的要求更改数据呈现的方式。

我把html和css从这里的多级下拉菜单：
https://phppot.com/css/multilevel-dropdown-menu-with-pure-css/
：当从这个答案点击外的代码以关闭菜单下拉
的https： //stackoverflow.com/a/59234391/9262488

希望您觉得这个有帮助。

— NiK648
source
我已经检查了您的代码。工作正常 感谢您发布答案。您能告诉我您如何获取我的数据吗？http请求（mocky.io）。
— Arvind Chourasiya
Mocky是用于创建模拟休息api的在线工具。我拿走了您发布的数据，并用它来模拟创建rest api。
— NiK648
1

为什么不创建树组件并将其输入递归绑定到树组件？

建议的解决方案是

  • 与深度无关-适用于数据树中任意数量的级别（即使临时更改）
  • 效率很高-它汇总了您的数据O(n)。

首先设计数据模型-它必须是树节点结构：

export interface GroupId { /* appropriate members... */ }

export interface ParentLocationGroup { /* other members... */ __text: string; }

export interface LgLevel { /* other members... */ __text: string; }

export interface DataModel {
  Id: string,
  Name: string,
  GroupId: GroupId,
  ParentLocationGroup: ParentLocationGroup,
  LgLevel: LgLevel,
  children: DataModel[]
}

然后将数据聚合到顶级组件中（或者甚至更好-在数据服务中；您应该能够足够容易地对其进行抽象）：

// dropdown.component.ts

@Component({
  selector: 'app-dropdown',
  template: `
    <ul class="nav site-nav">
      <li class=flyout>
        <a href=#>Dropdown</a>
        <app-dynamic-flyout [data]="data"></app-dynamic-flyout>
      </li>
    </ul>
  `
})
export class DropdownComponent {

  data: DataModel[];

  constructor(dataService: YourDataService){

    let data;
    dataService.getYourData()
      .pipe(map(d => d.ArrayOfLocationGroup.LocationGroup)))
      // Make sure every item has the `children` array property initialized
      // since it does not come with your data
      .subscribe(d => data = d.map(i => ({...i, children: []})));

    // Create a lookup map for building the data tree
    let idMap = data.reduce((acc, curr) => ({...acc, [curr.Id]: curr}), {});
    this.data = data.reduce(
      (acc, curr) => curr.LgLevel.__text == 0 || !curr.ParentLocationGroup
        // Either the level is 0 or there is no parent group
        // (the logic is unclear here - even some of your lvl 0 nodes have a `ParentGroup`)
        // -> we assume this is a top-level node and put it to the accumulator
        ? [...acc, curr]
        // Otherwise push this node to an appropriate `children` array
        // and return the current accumulator
        : idMap[curr.ParentLocationGroup.__text].children.push(curr) && acc, 
      []
    );
  }
}

并创建循环动态弹出组件：

// dynamic-flyout.component.ts

@Component({
  selector: 'app-dynamic-flyout',
  template: `
    <ul *ngIf="!!data.length" class="flyout-content nav stacked">
      <li *ngFor="let item of data" [class.flyout-alt]="!!item.children.length">
        <a href=#>{{item.Name}}</a>
        <app-dynamic-flyout [data]="item.children"></app-dynamic-flyout>
      </li>
    </ul>
  `
})
export class DynamicFlyoutComponent {
  @Input() data: DataModel[];
}

该解决方案未经测试，但可以为您指明正确的方向...

希望这有所帮助 ：-）

— Heehaaw
source
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