显示模式如果 Angular 中的条件为真？

Question

我只想在成功生成工单后显示模式。当用户单击按钮 "mybutton" 时，只有在没有错误的情况下才会打开模式。

ticket.components.ts

constructor(private _service: TicketService, private _idservice: SharedService) {
   }

generateTicket(){
    this._idservice.currentMessage.subscribe(message => this.userId = message)
    this._service.createTicketFromRemote(this.ticket, this.userId).subscribe(
      data => {
        console.log("response recieved");
        this.msg = "Ticket Successfully Generated";

        // code to display modal

      },
      error => {
        this.open_Modal = false;
        console.log("exception occured");
        console.log(error);

        // do nothing
      }
    )

  }

ticket.component.html


<button name="myButton" (click)="generateTicket()" class="btn btn-primary">Generate Ticket</button>

<!-- Modal -->
<div class="modal fade" id="exampleModalLong" tabindex="-1" role="dialog" aria-labelledby="exampleModalLongTitle" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLongTitle">Modal Title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body"> 
        <p class="text-center">Modal Body</p>
      </div>
      <div class="modal-footer"> 
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-warning">Print</button>
        <button type="submit" class="btn btn-primary"  data-dismiss="modal" >Edit</button>
      </div>
    </div>
  </div>
</div>

Answer 1

您可以使用简单的 ngIf 来实现：

generateTicket(){
    this._idservice.currentMessage.subscribe(message => this.userId = message)
    this._service.createTicketFromRemote(this.ticket, this.userId).subscribe(
      data => {
        console.log("response recieved");
        this.msg = "Ticket Successfully Generated";

        this.open_Modal = true; // <------

      },
      error => {
        this.open_Modal = false;
        console.log("exception occured");
        console.log(error);

        // do nothing
      }
    )

  }

在 html 中，将 ngIf 添加到主模态 div:

<div *ngIf="open_Modal" class="modal fade" id="exampleModalLong" tabindex="-1" role="dialog" aria-labelledby="exampleModalLongTitle" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLongTitle">Modal Title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body"> 
        <p class="text-center">Modal Body</p>
      </div>
      <div class="modal-footer"> 
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-warning">Print</button>
        <button type="submit" class="btn btn-primary"  data-dismiss="modal" >Edit</button>
      </div>
    </div>
  </div>
</div>

您还可以将主 div 包装到 ng-container 中，其中包含 ngIf，而不是在 div 中，以使代码更简洁：

<ng-container *ngIf="open_Modal">
<div  class="modal fade" id="exampleModalLong" tabindex="-1" role="dialog" aria-labelledby="exampleModalLongTitle" aria-hidden="true">
      <div class="modal-dialog" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLongTitle">Modal Title</h5>
            <button type="button" class="close" data-dismiss="modal" aria-label="Close">
              <span aria-hidden="true">&times;</span>
            </button>
          </div>
          <div class="modal-body"> 
            <p class="text-center">Modal Body</p>
          </div>
          <div class="modal-footer"> 
            <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
            <button type="button" class="btn btn-warning">Print</button>
            <button type="submit" class="btn btn-primary"  data-dismiss="modal" >Edit</button>
          </div>
        </div>
      </div>
    </div>
</ng-container>

Answer 2

class 模态有 css 属性 dispaly:none 所以你必须添加显示：块属性来显示模态。

Html

添加 ngClass 指令以有条件地添加或删除 showModal css class

div class="modal fade" [ngClass]="{'showModal': openModal}" id="exampleModalLong" tabindex="-1" role="dialog" aria-labelledby="exampleModalLongTitle" aria-hidden="true">
  <div class="modal-dialog" role="document">
    .......
</div>

课时

generateTicket(){
    this._idservice.currentMessage.subscribe(message => this.userId = message)
    this._service.createTicketFromRemote(this.ticket, this.userId).subscribe(
      data => {
        console.log("response recieved");
        this.msg = "Ticket Successfully Generated";

        this.openModal = true; // <------ Like Jacopo Sciampi said

      },

用于关闭模态。

closeModal() {
   this.openModal = false;
  }

css

.showModal {
   display:block;
}

Answer 3

您可以简单地使用此行从您的 .ts 文件打开模式

 $('#exampleModalLong').modal('show');

另外不要忘记声明美元符号“$”，在 .ts 文件中导入后使用这一行

declare var $: any;

显示模式如果 Angular 中的条件为真？

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