我有一个物质输入控件,我在用户输入时限制了特殊字符,但是在任何编辑器中键入一些单词并复制并粘贴具有特殊字符的单词时,这是不起作用的。
我已经编写了指令来防止特殊字符,但可以在复制粘贴中提供更好的解决方案限制。
app.component.html:
<form class="example-form">
<mat-form-field class="example-full-width">
<input matInput specialIsAlphaNumeric placeholder="Favorite food" value="Sushi">
</mat-form-field>
<mat-form-field class="example-full-width">
<textarea matInput placeholder="Leave a comment"></textarea>
</mat-form-field>
</form>
指示:
import { Directive, HostListener, Input } from '@angular/core';
@Directive({
selector: '[specialIsAlphaNumeric]'
})
export class SpecialCharacterDirective {
regexStr = '^[a-zA-Z0-9_]*$';
@Input() isAlphaNumeric: boolean;
@HostListener('keypress', ['$event']) onKeyPress(event) {
return new RegExp(this.regexStr).test(event.key);
}
}
https://stackblitz.com/edit/angular-cijbqy-biwrck?file=app%2Finput-overview-e[stackblit
重现步骤:
输入不允许的特殊字符:工作正常。而复制粘贴机智允许特殊字符
试试这样:
import { Directive, HostListener, ElementRef, Input } from '@angular/core';
@Directive({
selector: '[specialIsAlphaNumeric]'
})
export class SpecialCharacterDirective {
regexStr = '^[a-zA-Z0-9_]*$';
@Input() isAlphaNumeric: boolean;
constructor(private el: ElementRef) { }
@HostListener('keypress', ['$event']) onKeyPress(event) {
return new RegExp(this.regexStr).test(event.key);
}
@HostListener('paste', ['$event']) blockPaste(event: KeyboardEvent) {
this.validateFields(event);
}
validateFields(event) {
setTimeout(() => {
this.el.nativeElement.value = this.el.nativeElement.value.replace(/[^A-Za-z ]/g, '').replace(/\s/g, '');
event.preventDefault();
}, 100)
}
}
您可以使用Ng Knife实用程序
...
import { NgKnifeModule } from 'ng-knife';
...
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
NgKnifeModule
],
...
});
export class AppModule { }
<!-- Aphanumeric -->
<input knifeAlphanumeric type="text">
以下方法在不使用setTimeout调用的情况下工作,这意味着当使用other response by Aashish K Jha时,输入控件中没有闪烁的特殊字符
import { Directive, HostListener, ElementRef, Input } from '@angular/core';
@Directive({
selector: '[specialIsAlphaNumeric]'
})
export class SpecialCharacterDirective {
regexStr = '^[a-zA-Z0-9_]*$';
@Input() isAlphaNumeric: boolean;
constructor(private el: ElementRef) { }
@HostListener('keypress', ['$event']) onKeyPress(event) {
return new RegExp(this.regexStr).test(event.key);
}
@HostListener('paste', ['$event']) blockPaste(event: ClipboardEvent) {
this.validateFields(event);
}
validateFields(event: ClipboardEvent) {
event.preventDefault();
const pasteData = event.clipboardData.getData('text/plain').replace(/[^a-zA-Z0-9 ]/g, '');
document.execCommand('insertHTML', false, pasteData);
}
}