Angular 禁用按钮和垫输入错误消息
Angular disabling button and mat-input error message
我有一个文本框和一个按钮。文本框输入是 url 并且有一种验证 url 格式的方法,在此示例中为 isUrlFormatValid()。
如果isUrlFormatValid() 失败则文本框下方会出现错误信息,按钮变为被动状态,无法点击。但我的问题是当页面第一次加载时,这个方法的结果自动为假,所以直接错误消息也出现在空框上。
<mat-card class="">
<mat-card-content fxLayout="row wrap" fxLayoutAlign="left" fxLayoutGap="15px">
<div>
<mat-form-field>
<mat-label>Enter link here</mat-label>
<input type="url" matInput [(ngModel)]="domainName">
</mat-form-field>
<mat-error *ngIf="isUrlFormatValid()">
Please enter the link in correct format
</mat-error>
</div>
</mat-card-content>
<div>
<button type="button" id="search" class="" [disabled]="isUrlFormatValid()"
(click)="addClicked()">Add Domain
</button>
</div>
</mat-card>
而ts文件中的方法定义为:
isUrlFormatValid() {
const pattern = /^((((https?)(:\/\/))?((www)\.)?)?|mailto:(\w+\.?\w+)\@)([a-z0-9]+\.[a-z0-9]+)+$/;
if (pattern.test(this.domainName)) {
return false;
}
return true;
}
如果我更改 ts 文件中的行:
if (pattern.test(this.domainName))
至:
if (pattern.test(this.domainName) || this.domainName == null)
然后错误消息问题就解决了,但是这次按钮在启动时是可点击的,如果我写了一些是的,它正在工作,但是当页面第一次加载时它是活动的。
那么我该如何解决这个问题呢?
You may achieve the same without using an extra function. Just use some template driven form attributes & its control states as mentioned below. Also, It is a good practice to enclose your form elements in a <form>
tag. So, if you use form, your scenario would be -
只需将其添加到您的 组件 class -
public pattern = /^((((https?)(:\/\/))?((www)\.)?)?|mailto:(\w+\.?\w+)\@)([a-z0-9]+\.[a-z0-9]+)+$/;
而您的 HTML 将是 -
<form #f="ngForm" (ngSubmit)="addClicked()">
<mat-card class="">
<mat-card-content fxLayout="row wrap" fxLayoutAlign="left" fxLayoutGap="15px">
<div>
<mat-form-field>
<mat-label>Enter link here</mat-label>
<input type="url" matInput [(ngModel)]="domainName" #url="ngModel" [class.is-invalid]="url.invalid && url.touched"
name="url" [pattern]="pattern" required>
</mat-form-field>
<mat-error *ngIf="url.invalid && (url.dirty || url.touched)">
Please enter the link in correct format
</mat-error>
</div>
</mat-card-content>
<div>
<button type="button" id="search" class="" [disabled]="!f.valid">Add
Domain
</button>
</div>
</mat-card>
</form>
我有一个文本框和一个按钮。文本框输入是 url 并且有一种验证 url 格式的方法,在此示例中为 isUrlFormatValid()。
如果isUrlFormatValid() 失败则文本框下方会出现错误信息,按钮变为被动状态,无法点击。但我的问题是当页面第一次加载时,这个方法的结果自动为假,所以直接错误消息也出现在空框上。
<mat-card class="">
<mat-card-content fxLayout="row wrap" fxLayoutAlign="left" fxLayoutGap="15px">
<div>
<mat-form-field>
<mat-label>Enter link here</mat-label>
<input type="url" matInput [(ngModel)]="domainName">
</mat-form-field>
<mat-error *ngIf="isUrlFormatValid()">
Please enter the link in correct format
</mat-error>
</div>
</mat-card-content>
<div>
<button type="button" id="search" class="" [disabled]="isUrlFormatValid()"
(click)="addClicked()">Add Domain
</button>
</div>
</mat-card>
而ts文件中的方法定义为:
isUrlFormatValid() {
const pattern = /^((((https?)(:\/\/))?((www)\.)?)?|mailto:(\w+\.?\w+)\@)([a-z0-9]+\.[a-z0-9]+)+$/;
if (pattern.test(this.domainName)) {
return false;
}
return true;
}
如果我更改 ts 文件中的行:
if (pattern.test(this.domainName))
至:
if (pattern.test(this.domainName) || this.domainName == null)
然后错误消息问题就解决了,但是这次按钮在启动时是可点击的,如果我写了一些是的,它正在工作,但是当页面第一次加载时它是活动的。
那么我该如何解决这个问题呢?
You may achieve the same without using an extra function. Just use some template driven form attributes & its control states as mentioned below. Also, It is a good practice to enclose your form elements in a
<form>
tag. So, if you use form, your scenario would be -
只需将其添加到您的 组件 class -
public pattern = /^((((https?)(:\/\/))?((www)\.)?)?|mailto:(\w+\.?\w+)\@)([a-z0-9]+\.[a-z0-9]+)+$/;
而您的 HTML 将是 -
<form #f="ngForm" (ngSubmit)="addClicked()">
<mat-card class="">
<mat-card-content fxLayout="row wrap" fxLayoutAlign="left" fxLayoutGap="15px">
<div>
<mat-form-field>
<mat-label>Enter link here</mat-label>
<input type="url" matInput [(ngModel)]="domainName" #url="ngModel" [class.is-invalid]="url.invalid && url.touched"
name="url" [pattern]="pattern" required>
</mat-form-field>
<mat-error *ngIf="url.invalid && (url.dirty || url.touched)">
Please enter the link in correct format
</mat-error>
</div>
</mat-card-content>
<div>
<button type="button" id="search" class="" [disabled]="!f.valid">Add
Domain
</button>
</div>
</mat-card>
</form>