How to style the angular2 material slide-toggle button

Question

I am new to angular 2 and material design. I would like to know how to style the slide-toggle button to be smaller.

 <div class="example-section">
  <mat-slide-toggle class="line-toggle"
    <span class="font-size-12">Slide Me</span>
  </mat-slide-toggle>
</div>

The css is as below

  .example-section {
  display: flex;
  align-content: center;
  align-items: center;
  height: 18px;
  margin-top: -12px;
}
 .line-toggle{
  height: 10px;
  line-height: 8px;
 }

I would like to decrease the size of the button and reduce the height of the slider.

score 7 · Accepted Answer · answered Dec 14 '17 at 20:11

I've found you can use /deep/ in the css but you also have to target the specific classes.

/deep/ .mat-slide-toggle-bar {
  height: 7px !important;
}
/deep/ .mat-slide-toggle-thumb {
  height: 10px !important;
  width: 10px !important;
}

Something else to keep in mind is viewEncapsulation because deep allows you to break this convention since the styles are set in such a way with Angular that they are applied inline.

Related stack post: How to overwrite angular 2 material styles?

Related Angular Documentation: https://angular.io/guide/component-styles#!#-deep-

Please notice that the CSS **/deep/** selector had been deprecated, look for alternatives. — Gil Epshtain, Apr 09 '18 at 15:58

score 7 · Answer 2 · edited Aug 30 '18 at 09:38

@tallgeese117 's answer is really very helpful. I would like to add few more lines of code to the their answer so that it will display the toggle in the required size and look:

/deep/ .mat-slide-toggle-bar {
  height: 7px !important;
  width: 28px !important;
}

/deep/ .mat-slide-toggle-thumb {
  height: 10px !important;
  width: 10px !important;
}

/deep/ .mat-slide-toggle.mat-checked .mat-slide-toggle-thumb-container {
    transform: translate3d(18px,0,0) !important;
}

/deep/ .mat-slide-toggle-thumb-container {
    width: 12px !important;
    height: 12px !important;
    top: -2px !important;
}

score 2 · Answer 3 · answered Dec 08 '18 at 08:37

I used the solution provided by @tallgeese117 above. But in VScode, the CSS file was showing in red (\deep\), which was annoying. I couldn't find a way to ignore this css lint check. Thus I tried an alternative (altering css dynamically). I am pasting it below for others:

    ngOnInit() {
        let eleArray = document.getElementsByClassName('mat-slide-toggle-content');
        for(let i = 0 ; i < eleArray.length; i++) {
          // @ts-ignore
          eleArray[i].style.cssText = 'font-size:6vw;';
        }
    }

Caleb · Answer 4 · 2021-01-25T21:59:22.580

As others have mentioned, you need to style the internal classes of mat-slide-toggle (mat-slide-toggle-bar, mat-slide-toggle-thumb, etc). However, /deep/ and ::ng-deep are deprecated, so you shouldn't be using those. One option is to set global styling that is more specific than the default styling on the component. So in a global style file, you could do something like this:

mat-slide-toggle.mat-slide-toggle .mat-slide-toggle-bar {
  height: 8px;
  width: 26px;
}

mat-slide-toggle.mat-slide-toggle .mat-slide-toggle-thumb {
  height: 14px;
  width: 14px;
}

//...etc

Combining the component name and class name gives more specificity than the mat-slide-toggle default styling, so it overrides it.

References:

How to style the angular2 material slide-toggle button

4 Answers4

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