悬停在mat-autocomplete中时如何显示整个选项值 [英] How to display entire option value when hovered in mat-autocomplete

问题描述

这是一个使用mat-autocomplete的演示应用程序，我从stackoverflow帖子中选择了在此处输入链接说明，我要显示选项的整个值.值长时.我在在此处输入链接描述时发现了类似的问题，但这并没有解决我的问题.我可以滚动并看到该值，可以修改CSS样式，以便滚动条正确可见.

This is demo app that uses mat-autocomplete, I picked from stackoverflow post enter link description here , I want to display option entire value. When the value is long. I found similar question asked enter link description here but this hasn't solved my problem. I can scroll and see the value, can modify css style so the scroll bar is properly visible.

看起来滚动条的其余部分被隐藏了！

Looks like remaining part of scroll bar is hidden!

我尝试了

.mat-option {

z-index:5000;
height:300px;
}

什么都没有解决！

最好将元素显示完整.

代码段 template.html

  <mat-form-field class="example-full-width">
    <input matInput placeholder="State" aria-label="State" [matAutocomplete]="auto" [formControl]="stateCtrl">
    <mat-autocomplete #auto="matAutocomplete" panelWidth="320px">
      <mat-option *ngFor="let state of filteredStates | async" [value]="state.name">
        <img class="example-option-img" aria-hidden [src]="state.flag" height="25">
        <span>{{state.name}}</span> |
        <small>Population: {{state.population}}</small>
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>

typescript.ts

 states: State[] = [
    {
      name: 'Arkansas',
      population: '2.978M',
      // https://commons.wikimedia.org/wiki/File:Flag_of_Arkansas.svg
      flag: 'https://upload.wikimedia.org/wikipedia/commons/9/9d/Flag_of_Arkansas.svg'
    },
    {
      name: 'California CaliforniaCaliforniaCaliforniaCaliforniaCaliforniaCaliforniaCaliforniaCaliforniaCaliforniaCalifornia',
      population: '39.14M',
      // https://commons.wikimedia.org/wiki/File:Flag_of_California.svg
      flag: 'https://upload.wikimedia.org/wikipedia/commons/0/01/Flag_of_California.svg'
    }

  ];

 constructor() {
    this.filteredStates = this.stateCtrl.valueChanges
      .pipe(
        startWith(''),
        map(state => state ? this._filterStates(state) : this.states.slice())
      );
  }

  private _filterStates(value: string): State[] {
    const filterValue = value.toLowerCase();

    return this.states.filter(state => state.name.toLowerCase().indexOf(filterValue) === 0);
  }

推荐答案

您有3种解决方法

1.将滚动条添加到mat-option，因为您已经在问题中滚动了滚动条

1.Adding scroll to mat-option as you already have that in your question

2.将宽度赋予mat-select，但是如果mat-option过长，也会出现此问题.

2.Giving width to mat-select, but this will also be issue if mat-option is too long.

3.此选项是自动换行-在CSS下方添加到mat-option

3.This option is to wrap text - add below css to mat-option

.mat-option {
 word-break: break-all;
 white-space: normal;
 height: unset;
}

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