mat-slider - Angular 材料实验 - _getHostElement 错误。 如何解决？

Question

I have recently upgraded to Angular 12 and installed Angular Material Experimental in order to try out the new mat-slider. I effectively want a range slider, which is not available in the current angular material package, and I'd prefer to stay within the Angular Material ecosystem.

From the following discussion is why I decided to try the new mat-slider in material experimental https://github.com/angular/components/issues/1331

Code:

Module:

import { MatSliderModule } from '@angular/material-experimental/mdc-slider'; with the appropriate imports etc

HTML: <mat-slider discrete markers thumbLabel [min]="0" [max]="100" [step]="5" values="[10,20]"></mat-slider>

GUI: I get the following visual - just a back bar for the slider img

Error: And the console error:

main.js:1 ERROR TypeError: Cannot read property '_getHostElement' of undefined
    at me.value (main.js:1)
    at Object.Lt.setThumbStyleProperty (main.js:1)
    at main.js:1
    at main.js:1
    at ae.<computed> (polyfills.js:1)
    at X.invokeTask (polyfills.js:1)
    at Object.onInvokeTask (main.js:1)
    at X.invokeTask (polyfills.js:1)
    at X.runTask (polyfills.js:1)
    at X.invokeTask (polyfills.js:1)

Normal Angular Material mat-sliders are not an issue to get working.

Is there something obvious that I am missing to get the _getHostElement error? Maybe another module to import? I can't seem to find anything related to this error for Mat-Slider in experimental.

Answer 1

I can confirm I also see this same error using the most basic experimental mat-slider. I am successfully using other experimental controls, it is just the slider that refuses to render correctly. This has been the case for quite a while and isn't a new issue.

Answer 2

I ran into the same problem. Apparently they have updated the code since you asked this question, because they now give you a hint in the console:

   Valid configurations are as follows:
    <mat-slider>
      <input matSliderStartThumb>
      <input matSliderEndThumb>
    </mat-slider>

Answer 3

You should probably use a dual range slider CSS customizatión since Angular material presents sometimes problems, try this:

HTML

<div class="range_container">
    <div class="sliders_control">
        <input id="fromSlider" type="range" value="10" min="0" max="100"/>
        <input id="toSlider" type="range" value="40" min="0" max="100"/>
    </div>
    <div class="form_control">
        <div class="form_control_container">
            <div class="form_control_container__time">Min</div>
            <input class="form_control_container__time__input" type="number" id="fromInput" value="10" min="0" max="100"/>
        </div>
        <div class="form_control_container">
            <div class="form_control_container__time">Max</div>
            <input class="form_control_container__time__input" type="number" id="toInput" value="40" min="0" max="100"/>
        </div>
    </div>
</div>

CSS:

    .range_container {
  display: flex;
  flex-direction: column;
  width: 80%;
  margin: 35% auto;
}

.sliders_control {
  position: relative;
  min-height: 50px;
}

.form_control {
  position: relative;
  display: flex;
  justify-content: space-between;
  font-size: 24px;
  color: #635a5a;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  pointer-events: all;
  width: 24px;
  height: 24px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px #C6C6C6;
  cursor: pointer;
}

input[type=range]::-moz-range-thumb {
  -webkit-appearance: none;
  pointer-events: all;
  width: 24px;
  height: 24px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px #C6C6C6;
  cursor: pointer;  
}

input[type=range]::-webkit-slider-thumb:hover {
  background: #f7f7f7;
}

input[type=range]::-webkit-slider-thumb:active {
  box-shadow: inset 0 0 3px #387bbe, 0 0 9px #387bbe;
  -webkit-box-shadow: inset 0 0 3px #387bbe, 0 0 9px #387bbe;
}

input[type="number"] {
  color: #8a8383;
  width: 50px;
  height: 30px;
  font-size: 20px;
  border: none;
}


input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button {  
   opacity: 1;
}

input[type="range"] {
  -webkit-appearance: none; 
  appearance: none;
  height: 2px;
  width: 100%;
  position: absolute;
  background-color: #C6C6C6;
  pointer-events: none;
}

#fromSlider {
  height: 0;
  z-index: 1;
}