我使用的是最新版本的Angular(v6.0.5)。
我有一个由3个常用控件组成的FormGroup,并根据一些逻辑我想将其他多个控件添加到同一个FormGroup。
我知道我可以使用this.form.addControl()
但我不想为每个单独的表单控件执行此操作
有一种简单的方法吗?
示例:
this.form = this.formBuilder.group({
'id': new FormControl('', Validators.required),
'firstName' new FormControl('', Validators.required),
'lastName' new FormControl('', Validators.required)
});
if (blah) {
// Append more FormControls here to same FormGroup
this.form.addControl('houseNumber', new FormControl(''));
this.form.addControl('street', new FormControl(''));
this.form.addControl('postCode', new FormControl(''));
}
答案 0 :(得分:4)
出于某种原因Angular didn't provide API就此而言。
您可以简单地循环控件并将其添加到FormGroup,或者您可以基于现有的构建新的FormGroup:
this.form = this.formBuilder.group({
'id': new FormControl('', Validators.required),
'firstName': new FormControl('', Validators.required),
'lastName': new FormControl('', Validators.required)
});
let blah = true;
if (blah) {
this.form = this.formBuilder.group({
...this.form.controls,
'houseNumber': new FormControl(''),
'street': new FormControl('')
});
} else {
this.form = this.formBuilder.group({
...this.form.controls,
'otherControl': new FormControl(''),
'otherControl2': new FormControl(''),
'otherControl3': new FormControl('')
});
}
<强> Ng-run Example 强>
答案 1 :(得分:2)
如果您不想延迟创建表单,可以执行以下操作:
// You can write this sugar, you don't have to write new FormControl
const form = {
id: ['', Validators.required],
firstName: ['', Validators.required],
lastName: ['', Validators.required]
};
if (blah) {
form.someField: ['', Validators.required];
} else {
form.someotherField: ['', Validators.required];
}
this.form = this.formBuilder.group(form);
或者这个较短的内联版本:
this.form = this.formBuilder.group({
id: ['', Validators.required],
firstName: ['', Validators.required],
lastName: ['', Validators.required],
...(blah ? {form.someField: ['', Validators.required]} : {form.someotherField: ['', Validators.required]})
});