Javascript 在4中提交表单之前输入字段验证
我的目标是确保用户在提交表单之前输入有效数据(无数字),并且输入字段不应为空。救命啊 ts文件代码如下所示:Javascript 在4中提交表单之前输入字段验证,javascript,html,forms,angular,typescript,Javascript,Html,Forms,Angular,Typescript,我的目标是确保用户在提交表单之前输入有效数据(无数字),并且输入字段不应为空。救命啊 ts文件代码如下所示: import { Routes, RouterModule, Router, ActivatedRoute } from "@angular/router"; import { Component, NgModule, Input, Output, EventEmitter } from '@angular/core'; import { Environments } from './E
import { Routes, RouterModule, Router, ActivatedRoute } from "@angular/router";
import { Component, NgModule, Input, Output, EventEmitter } from '@angular/core';
import { Environments } from './Environment-class';
import { FormBuilder, FormsModule, ReactiveFormsModule, FormGroup, FormControl, Validators } from '@angular/forms';
@Component({
selector: 'addenvironment-form',
templateUrl: './add-environment-form.component.html'
})
export class AddEnvironmentComponent {
@Output() EnvironementCreated = new EventEmitter<Environments>();
createNewEnv(EnvironmentNames: string) {
this.EnvironementCreated.emit(new Environments(EnvironmentNames));
}
从“@angular/Router”导入{Routes,RouterModule,Router,ActivatedRoute};
从“@angular/core”导入{Component,NgModule,Input,Output,EventEmitter};
从“./Environment class”导入{Environments};
从“@angular/forms”导入{FormBuilder、FormsModule、ReactiveFormsModule、FormGroup、FormControl、Validators};
@组成部分({
选择器:'addenvironment form',
templateUrl:“./add environment form.component.html”
})
导出类AddenEnvironment组件{
@Output()environmentcreated=neweventemitter();
createNewEnv(环境名称:字符串){
this.environmentcreated.emit(新环境(EnvironmentNames));
}
}
和HTML文件
<br />
<div class="card">
<h4 class="card-header">Add a New Environment</h4>
<div class="card-body mx-auto ">
<form class="form-inline ">
<div class="form-group ">
<h5 class="form-control-static">Enter New Name: </h5>
</div>
<div class="form-group mx-lg-3 text-center">
<label for="inputPassword2" class="sr-only">Password</label>
<input type="text" class="form-control " id="inputPassword4" placeholder=" Name " #EnvironmentNames>
</div>
<button type="submit" class="btn btn-primary" (click)="createNewEnv(EnvironmentNames.value)">Submit</button>
</form>
</div>
添加新环境
输入新名称:
密码
提交
您可以将
必需的
标记添加到输入字段中,以便必须填写它。
此外,您还可以添加minlength
。
要使其仅为字母,您可以使用模式
。你可以玩你想让用户输入的字符
如果您要使用此输入作为密码,我建议您将类型更改为type=“password”
如果表单无效,您还可以禁用
按钮
上面提到了所有这些,您的表单应该类似于下面的内容:
<form [formGroup]="myForm" class="form-inline ">
<div class="form-group ">
<h5 class="form-control-static">Enter New Name: </h5>
</div>
<div class="form-group mx-lg-3 text-center">
<label for="inputPassword2" class="sr-only">Password</label>
<input type="password" class="form-control " id="inputPassword4"
placeholder=" Name " #EnvironmentNames pattern="^[a-zA-Z]+$"
minlength="8" required>
</div>
<button type="submit" class="btn btn-primary"
(click)="createNewEnv(EnvironmentNames.value)"
[disabled]="!myForm.valid">Submit
</button>
</form>
输入新名称:
密码
提交