Javascript 需要使用角度2从两个字段中选择一个
我正在尝试创建一个联系人表单。表单如下所示:Javascript 需要使用角度2从两个字段中选择一个,javascript,html,angular,Javascript,Html,Angular,我正在尝试创建一个联系人表单。表单如下所示: <form novalidate [formGroup]="contact" (ngSubmit)="send()"> <p> <label>Name <br> <input type="text" class="input" value="" formControlName="name"> <span class="error">
<form novalidate [formGroup]="contact" (ngSubmit)="send()">
<p>
<label>Name
<br>
<input type="text" class="input" value="" formControlName="name">
<span class="error">Enter your name</span>
</label>
</p>
<p>
<label>E-mail
<br>
<input type="email" class="input" value="" formControlName="email">
<span class="error">It looks like this email is invalid</span>
</label>
</p>
<p>
<label>Phone
<br>
<input type="text" class="input" value="" formControlName="telefone">
<span class="error">It looks like this phone number is invalid</span>
</label>
</p>
<p>
<label>Message
<br>
<textarea type="text" class="input" value="" formControlName="message"></textarea>
<span class="error">The message can't be empty</span>
</label>
</p>
<p class="submit">
<input type="submit" name="submit" class="bt" value="Send">
</p>
</form>
this.contact = this.formBuilder.group({
name: ['', Validators.required],
email: ['', Validators.required],
phone: ['', Validators.required],
message: ['', Validators.required]
}, {validator: this.customValidationFunction})
我尝试使用自定义验证器作为解决方案,但我找不到解决方案。有什么建议吗?是的,定制验证器是最好的选择 使您的表单组如下所示:
<form novalidate [formGroup]="contact" (ngSubmit)="send()">
<p>
<label>Name
<br>
<input type="text" class="input" value="" formControlName="name">
<span class="error">Enter your name</span>
</label>
</p>
<p>
<label>E-mail
<br>
<input type="email" class="input" value="" formControlName="email">
<span class="error">It looks like this email is invalid</span>
</label>
</p>
<p>
<label>Phone
<br>
<input type="text" class="input" value="" formControlName="telefone">
<span class="error">It looks like this phone number is invalid</span>
</label>
</p>
<p>
<label>Message
<br>
<textarea type="text" class="input" value="" formControlName="message"></textarea>
<span class="error">The message can't be empty</span>
</label>
</p>
<p class="submit">
<input type="submit" name="submit" class="bt" value="Send">
</p>
</form>
this.contact = this.formBuilder.group({
name: ['', Validators.required],
email: ['', Validators.required],
phone: ['', Validators.required],
message: ['', Validators.required]
}, {validator: this.customValidationFunction})
然后让customValidationFunction
检查验证。虚构验证,例如:
customValidationFunction(formGroup): any {
let nameField = formGroup.controls['name'].value; //access any of your form fields like this
return (nameField.length < 5) ? { nameLengthFive: true } : null;
}
customValidationFunction(formGroup):任何{
让nameField=formGroup.controls['name'].value;//像这样访问任何表单字段
返回值(nameField.length<5){nameLengthFive:true}:null;
}
按如下方式更改每个输入(将p标记更改为divs。在适当的情况下,为每个输入替换控件名称,并更改隐藏范围标记验证的语法):
名称
输入您的姓名
我创建了一个自定义验证器指令:
import {
FormGroup,
ValidationErrors,
ValidatorFn,
Validators,
} from '@angular/forms';
export const atLeastOne = (validator: ValidatorFn, controls:string[] = null) => (
group: FormGroup,
): ValidationErrors | null => {
if(!controls){
controls = Object.keys(group.controls)
}
const hasAtLeastOne = group && group.controls && controls
.some(k => !validator(group.controls[k]));
return hasAtLeastOne ? null : {
atLeastOne: true,
};
};
要使用它,您只需执行以下操作:
this.form = this.formBuilder.group({
name: ['', Validators.required],
email:[''],
telefone:[''],
message:['', Validators.required],
}, { validator: atLeastOne(Validators.required, ['email','telefone']) });
因此这里需要电子邮件
或电话
。如果将其保留为空,则任何具有值的控件都可以,并且您可以将其与任何类型的验证器一起使用,而不仅仅是验证器。必选
这可以以任何形式重复使用
我已经更新了我的验证器代码段,以支持字符串和数字类型
我的灵感来自托德·斯凯尔顿。这是一个非常简单的验证器,只执行您要求的操作,而不执行其他操作:
/**
*验证提供的字段中是否至少有一个具有值。
*字段只能是number或string类型。
*@param fields应检查的表单字段的名称
*/
导出函数atLeastOne(…字段:字符串[]){
返回(fg:FormGroup):ValidationErrors | null=>{
返回字段。一些(字段名=>{
const field=fg.get(fieldName).value;
如果(字段类型=='number')返回字段和字段>=0,则为true:false;
如果(typeof field==='string')返回字段和field.length>0,则为true:false;
})
无效的
:({atlestone:'必须至少提供一个字段。}作为ValidationErrors);
};
}
稍微改变了Florian对懒惰者的回答,因为这让ts sonar生气(认知复杂性规则):
要显示自定义错误nameLengthFive
记住hasrerror是在FormGroup
上调用的,而不是在FormControl
上调用的。你的答案是正确的,很容易被忽略。你传递的函数命名错误(应该是atlestone
,而不是atlestoneof
)
const isFieldEmpty = (fieldName: string, fg: FormGroup) => {
const field = fg.get(fieldName).value;
if (typeof field === 'number') { return field && field >= 0 ? true : false; }
if (typeof field === 'string') { return field && field.length > 0 ? true : false; }
};
export function atLeastOne(...fields: string[]) {
return (fg: FormGroup): ValidationErrors | null => {
return fields.some(fieldName => isFieldEmpty(fieldName, fg))
? null
: ({ atLeastOne: 'At least one field has to be provided.' } as ValidationErrors);
};
}