我在查找使用組件時為什么會得到額外的 mat-form-field-underline 時遇到問題。我的頁面使用以下代碼
<mat-form-field class="col-md-6">
<app-mat-select-all
[data]="tractList$"
formControlName="tractList"
fieldName="name"
[multiselect]=true
labelText="Tract List"
idField="guid"
>
</app-mat-select-all>
</mat-form-field>
And my custom component has the following template code
<form novalidate [formGroup]="form">
<mat-form-field>
<mat-label>{{labelText}}</mat-label>
<mat-select #select [multiple]="multiselect" [formControl]="selectField" >
<div class="select-all">
<mat-checkbox *ngIf="multiselect" [(ngModel)]="allSelected"
[ngModelOptions]="{standalone: true}"
[indeterminate]="isIndeterminate()"
[checked]="isChecked()"
(click)="$event.stopPropagation()"
(change)="toggleAllSelection($event)">{{text}}</mat-checkbox>
</div>
<mat-option *ngFor="let item of data" [value]="item[idField]">
{{item[fieldName]}}
</mat-option>
</mat-select>
</mat-form-field>
</form>
在渲染的頁面上看起來像這樣
當我將以下行添加到我的父樣式表時，所有 mat-form-field-underlines 都消失了，這不是我想要的。如果我去洗掉自定義組件中的 mat-form-field，我只會得到一行，但是 mat-form-field-underline 的對齊與頁面上的其他組件不匹配。所以我需要找到一種方法，只針對第二個下劃線才能洗掉。
::ng-deep .mat-form-field-underline {
display: none;
}
這是一個 stackblitz 示例，它演示了此問題的第二個下劃線StackBlitz 示例
這是我檢查時的代碼，似乎由于某種原因在 mat-form-field 內有一個 mat-form-field。不知道為什么？
<mat-form-field _ngcontent-jtb-c709="" class="mat-form-field col-md-6 ng-tns-c393-17 mat-primary mat-form-field-appearance-legacy mat-form-field-can-float mat-form-field-hide-placeholder"><div class="mat-form-field-wrapper ng-tns-c393-17"><div class="mat-form-field-flex ng-tns-c393-17"><!--bindings={
"ng-reflect-ng-if": "false"
}--><!--bindings={
"ng-reflect-ng-if": "0"
}--><div class="mat-form-field-infix ng-tns-c393-17"><app-mat-select-all _ngcontent-jtb-c709="" formcontrolname="tractList" fieldname="name" labeltext="Tract List" idfield="guid" _nghost-jtb-c804="" ng-reflect-field-name="name" ng-reflect-label-text="Tract List" ng-reflect-id-field="guid" ng-reflect-name="tractList" ng-reflect-form-control-name="tractList" class="ng-tns-c393-17 ng-untouched ng-pristine ng-valid" ng-reflect-multiselect="true" ng-reflect-data="[object Object],[object Object"><form _ngcontent-jtb-c804="" novalidate="" ng-reflect-form="[object Object]" class="ng-untouched ng-pristine ng-valid"><mat-form-field _ngcontent-jtb-c804="" class="mat-form-field ng-tns-c393-18 mat-primary mat-form-field-type-mat-select mat-form-field-appearance-legacy mat-form-field-can-float mat-form-field-has-label mat-form-field-hide-placeholder ng-untouched ng-pristine ng-valid"><div class="mat-form-field-wrapper ng-tns-c393-18"><div class="mat-form-field-flex ng-tns-c393-18"><!--bindings={
"ng-reflect-ng-if": "false"
}--><!--bindings={
"ng-reflect-ng-if": "0"
}--><div class="mat-form-field-infix ng-tns-c393-18"><mat-select _ngcontent-jtb-c804="" role="combobox" aria-autocomplete="none" aria-haspopup="true" class="mat-select ng-tns-c500-19 ng-tns-c393-18 ng-star-inserted mat-select-empty mat-select-multiple ng-untouched ng-pristine ng-valid" ng-reflect-multiple="true" ng-reflect-form="[object Object]" aria-labelledby="mat-form-field-label-19 mat-select-value-15" id="mat-select-14" tabindex="0" aria-expanded="false" aria-required="false" aria-disabled="false" aria-invalid="false"><div cdk-overlay-origin="" class="mat-select-trigger ng-tns-c500-19"><div class="mat-select-value ng-tns-c500-19" ng-reflect-ng-switch="true" id="mat-select-value-15"><span class="mat-select-placeholder mat-select-min-line ng-tns-c500-19 ng-star-inserted"></span><!--bindings={
"ng-reflect-ng-switch-case": "true"
}--><!--bindings={
"ng-reflect-ng-switch-case": "false"
}--></div><div class="mat-select-arrow-wrapper ng-tns-c500-19"><div class="mat-select-arrow ng-tns-c500-19"></div></div></div><!--bindings={
"ng-reflect-offset-y": "0"
}--></mat-select><span class="mat-form-field-label-wrapper ng-tns-c393-18"><label class="mat-form-field-label ng-tns-c393-18 mat-empty mat-form-field-empty ng-star-inserted" ng-reflect-disabled="true" id="mat-form-field-label-19" ng-reflect-ng-switch="true" for="mat-select-14" aria-owns="mat-select-14"><!--bindings={
"ng-reflect-ng-switch-case": "false"
}--><mat-label _ngcontent-jtb-c804="" class="ng-tns-c393-18 ng-star-inserted">Tract List</mat-label><!--bindings={
"ng-reflect-ng-switch-case": "true"
}--><!--bindings={
"ng-reflect-ng-if": "false"
}--></label><!--bindings={
"ng-reflect-ng-if": "true"
}--></span></div><!--bindings={
"ng-reflect-ng-if": "0"
}--></div><div class="mat-form-field-underline ng-tns-c393-18 ng-star-inserted"><span class="mat-form-field-ripple ng-tns-c393-18"></span></div><!--bindings={
"ng-reflect-ng-if": "true"
}--><div class="mat-form-field-subscript-wrapper ng-tns-c393-18" ng-reflect-ng-switch="hint"><!--bindings={
"ng-reflect-ng-switch-case": "error"
}--><div class="mat-form-field-hint-wrapper ng-tns-c393-18 ng-trigger ng-trigger-transitionMessages ng-star-inserted" style="opacity: 1; transform: translateY(0%);"><!--bindings={
"ng-reflect-ng-if": ""
}--><div class="mat-form-field-hint-spacer ng-tns-c393-18"></div></div><!--bindings={
"ng-reflect-ng-switch-case": "hint"
}--></div></div></mat-form-field></form></app-mat-select-all><span class="mat-form-field-label-wrapper ng-tns-c393-17"><!--bindings={
"ng-reflect-ng-if": "false"
}--></span></div><!--bindings={
"ng-reflect-ng-if": "0"
}--></div><div class="mat-form-field-underline ng-tns-c393-17 ng-star-inserted"><span class="mat-form-field-ripple ng-tns-c393-17"></span></div><!--bindings={
"ng-reflect-ng-if": "true"
}--><div class="mat-form-field-subscript-wrapper ng-tns-c393-17" ng-reflect-ng-switch="hint"><!--bindings={
"ng-reflect-ng-switch-case": "error"
}--><div class="mat-form-field-hint-wrapper ng-tns-c393-17 ng-trigger ng-trigger-transitionMessages ng-star-inserted" style="opacity: 1; transform: translateY(0%);"><!--bindings={
"ng-reflect-ng-if": ""
}--><div class="mat-form-field-hint-spacer ng-tns-c393-17"></div></div><!--bindings={
"ng-reflect-ng-switch-case": "hint"
}--></div></div></mat-form-field>
uj5u.com熱心網友回復：
當你這樣做時：
::ng-deep .mat-form-field-underline {
display: none;
}
這將適用于所有具有此類的材料組件。您應該做的是將自定義類添加到 HTML 中的組件，然后在 SCSS 檔案中像這樣參考它：
<mat-form-field class="custom-class">
...
</mat-form-field>
::ng-deep .custom-class .mat-form-field-underline {
display: none;
}
現在，只有那個組件會受到::ng-deep覆寫。
作業示例
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