Question

我正在尝试根据item._id .i存储项目在组件中更改标题。这是我的HTML

<h1 mat-dialog-title>{{item._id ? "Update" : "Add"}} animal</h1>

下面是我的dialog-overview-example.ts

import {Component, Inject} from '@angular/core';
import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';

/**
 * @title Dialog Overview
 */
@Component({
  selector: 'dialog-overview-example',
  templateUrl: 'dialog-overview-example.html',
  styleUrls: ['dialog-overview-example.css'],
})  
export class DialogOverviewExample {

  animal: string;
  name: string;
  item:string;

  constructor(public dialog: MatDialog) {}

  openDialog(): void {

  item =[{"_id": "2","animal":"lion","weiht":"100"}];
    let dialogRef = this.dialog.open(DialogOverviewExampleDialog, {
      width: '250px',
      data: { name: this.name, animal: this.animal,item: this.item }
    });

    dialogRef.afterClosed().subscribe(result => {
      console.log('The dialog was closed');
      this.animal = result;
    });
  }

}

@Component({
  selector: 'dialog-overview-example-dialog',
  templateUrl: 'dialog-overview-example-dialog.html',
})
export class DialogOverviewExampleDialog {

  constructor(
    public dialogRef: MatDialogRef<DialogOverviewExampleDialog>,
    @Inject(MAT_DIALOG_DATA) public data: any) { }

  onNoClick(): void {
    this.dialogRef.close();
  }

}

Demo

如果项目标题中有_id应该显示更新动物，否则它应该在我们的案例ID中显示添加动物已经存在于项目中所以它应该显示更新动物..帮助我

Answer 1

我可以看到您已将组件内的项目定义为数组。所以你必须在HTML中使用以下代码

<h1 mat-dialog-title>{{item[0]._id ? "Update" : "Add"}} animal</h1>

如何根据角度值显示标题？

1 个答案: