材料角4的扩展面板

Question

I hava an angular 4.4.4 application with material 2.0.0-beta.12 and I want to use the mat-expansion-panel from material design.

This is my code :

           <mat-expansion-panel class="parametersPanel">
                    <mat-expansion-panel-header>
                        <mat-panel-title>
                            PARAMETERS
                        </mat-panel-title>
                    </mat-expansion-panel-header>
                    <table style="width:100%">
                        <tbody>
                            <tr class="parameterListItem">
                                <td class="icon"><img src="assets/images/alert.png"></td>
                                <td class="parameterName">Parameter 1</td>
                                <td class="parameterValue">Value</td>
                                <td class="unit">unit</td>
                            </tr>                        
                        </tbody>
                    </table>
            </mat-expansion-panel>

So it works well but it possible to remove the margin in the mat-expansion-panel-body which has, from the browser margin: 0 24px 16px; ?

Answer 1

In your style.css or your components style you need to add the following css:

/deep/ .parametersPanel .mat-expansion-panel-body {
    padding: 0;
}

This is due to view encapsulation. You can read more about this here: https://angular.io/guide/component-styles

Update:

The use of /deep/ , ::ng-deep to modify the styles of material components has been deprecated. See this link .

However, using @angular/core ^6.1.0 and @angular/material ^6.4.6 I was able to change the style of Angular Material's Expansion panel without having to add anything specific. It seems like you can now simply change the style in your components css file. So this should work:

.mat-expansion-panel-body {
    padding: 0;
}

You can read here for more information about the deprecation of /deep/ , ::ng-deep here .

Answer 2

This works 100%.

Add this inside your style.css:

.mat-expansion-panel-content > .mat-expansion-panel-body {
  padding: 0 !important;
}

Answer 3

Instead of /deep/ you should use ::ng-deep , which is an alias provided by angular. Support for /deep/ etc. is already removed from chrome browser. So in your example that would be:

::ng-deep .parametersPanel .mat-expansion-panel-body {
    padding: 0;
}

Answer 4

this one worked for me

::ng-deep .mat-expansion-panel-body {
    padding: 0px 0px 0px 0px; 
}

I hope that will work for you

Answer 5

::ng-deep .mat-expansion-panel-body {
    padding: 0 !important;
}

Answer 6

if you add it to the main styles.scss it works (not at the component style level)

.mat-expansion-panel-body {
    padding: 0;
}

Answer 7

This code below will work when added to your components css file

:host {
  ::ng-deep {
    .mat-expansion-panel-spacing {
      margin: 0px 0 !important;
    }
  }
}

Answer 8

The easiest and safest way to do it is to include this in your project global style.scss

app-instruction mat-expansion-panel.trigger-panel {
.mat-expansion-panel-body {
    padding:0;
}

}

• app-instruction => your component selector in the component.ts file.
• mat-expansion-panel => selector for mat-expansion-panel.
• .trigger-panel => is a css class I included on the mat-expansion-panel to select only this one in the component.html file.

Answer 9

This code helped me.

.mat-expansion-panel-header {
   padding: 0px 16px;
}

Answer 10

for @angular/material version +10

You need to add encapsulation: ViewEncapsulation.None property into your @Component decorator

@Component({
  selector: '...',
  ...
  encapsulation: ViewEncapsulation.None
})
export class myApp{}

Then this will work

.mat-expansion-panel-body {
  padding: 0 !important;
}

Note that ::ng-deep and /deep/ will not work on the new version of angular/material as @nicholaschris says

Answer 11

You can easily remove parent padding.

<div class="removePadding">
   <mat-list-item *ngFor="let item of item.children" class="testingSmall">
      <h3 matLine>{{item.label}}</h3>
   </mat-list-item>
</div>

.removePadding{
   margin: 0 -24px -16px;
}