使用 Angular 5 在 Angular Material Autocomplete 显示中绑定“this" [英] Binding 'this' in Angular Material Autocomplete displayWith using Angular 5

问题描述

我试图使用 Material Angular 自动完成功能，但我遇到了 displayWith 函数，该函数显然可以用作选择时显示的输出.我想在显示函数中调用一个自定义函数，如

I was trying to use the Material Angular autocomplete and I came across the displayWith function which can be apparently used to be the output that is displayed on selection. I wanted to call a custom function within the display function like

displayFn(id) {
 return this.getValue(id)
}
getValue(id) {
 /**return some string
}

对于自动完成

<mat-autocomplete #autoOutlet="matAutocomplete" [displayWith]="displayFn">
  <mat-option *ngFor="let option of outletFilterOptions | async [value]="option.outletId">
   {{ option.outletName }}
  </mat-option>
</mat-autocomplete>

如您所见，我使用 id 作为模型而不是整个对象.

As you see I am using the id as the model instead of the entire object.

当显示函数返回 this.getValue 未定义的错误时，我在 Stack Overflow 上搜索了一个解决方案，并被建议我使用类似 [displayWith]="displayFn.bind(this)".

When the display function returned an error that this.getValue is undefined I searched Stack Overflow for a solution and was suggested that I use something like [displayWith]="displayFn.bind(this)".

但不幸的是，这对我也不起作用.我正在使用 Angular 材料 5.1.0.

But unfortunately, that isn't working for me either. I am using Angular material 5.1.0.

有什么我遗漏的吗?

推荐答案

displayFn = value => {
  // now you have access to 'this' 
  this.someMethod();
  return 'formatted display';
}

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