在角度形式数组中使用setControl或patchValue时出错 [英] Error when using setControl or patchValue in angular form array
问题描述
请协助,我在下面嵌套了表格数组:
Please assist, I have nested form array, se below :
this.form = this.formBuilder.group({
projectTitle: ['', [Validators.required, Validators.maxLength(300)]],
projectDescription: ['', [Validators.required, Validators.maxLength(300)]],
funding: this.formBuilder.array([this._buildFundingItems()]),
});
this._buildFundingItems()
如下
private _buildFundingItems(): FormGroup {
return this.formBuilder.group({
items: ['', [Validators.required, Validators.pattern(this.regexValidation.shortWordRegex)]],,
amount: ['', [Validators.required, Validators.pattern(this.regexValidation.amountTypeRegex)]],
});
}
// after reloading the page, i get data from api and I tried setting the value as follows
this.form.setControl('funding', this.formBuilder.array(data.funding || []));
执行上述操作或this.form.setControl('funding', this.formBuilder.array(data.funding || []));
我遇到错误:Cannot find control with path: 'funding -> 0 -> amount'
和Cannot find control with path: 'funding -> 0 -> items'
.
doing the above or this.form.setControl('funding', this.formBuilder.array(data.funding || []));
i getting an error : Cannot find control with path: 'funding -> 0 -> amount'
and Cannot find control with path: 'funding -> 0 -> items'
.
在执行以下操作之前,我没有收到任何错误,但是在更新表单或(在valuechanges上)时,formarray没有更新.
Before i did the following below, i was not receiving any errors but when updating the form or (on valuechanges), the formarray was not updating.
let length: number = data[0].funding.length;
while (length-- > 0) {
fundingSupport.push(this._buildFundingItems());
}
this.form.controls['funding'] = this.formBuilder.array([]);
this.form.controls['funding'].patchValue(data.funding)
我看到了以下链接基于FormArray中的索引的Angular 4 patchValue 这就是我尝试第一种方法的原因.
I saw the following link Angular 4 patchValue based on index in FormArray that's why i tried the first approach.
推荐答案
如果我们不知道您拥有的数据或您想要获取的数据,这将是最困难的帮助. 我支持您的数据就像
It's difficut help if we don't know the data you have or the data you want to get. I supouse your data was like
{
projecTitle:"title",
projectDescription:"description"
items:[{
items:"item 1",
amount:10
},
{
items:"item 2",
amount:5
}]
}
为什么不使用函数来创建包含数据的表单?
why not use a function to create the form with the data included?
createForm(data:any)
{
this.form = this.formBuilder.group({
projectTitle: [data?data.projecTitle:'', [Validators.required, Validators.maxLength(300)]],
projectDescription: [data?data.projectDescription:'', [Validators.required, Validators.maxLength(300)]],
funding: //See that I change your formBuilder to return
//an array, this is because when create the array don't enclosed
// by [ ]
this.formBuilder.array(this._buildFundingItems(data?data.items:null)),
});
}
//see that I was to return an array of FormGroup
_buildFundingItems(items:any[]|null):FormGroup[]
{
return items?items.map(x=>{
return this.formBuilder.group({
items: [x.items, [Validators.required, Validators.pattern(this.regexValidation.shortWordRegex)]]
amount: [x.amount, [Validators.required, Validators.pattern(this.regexValidation.amountTypeRegex)]]
}):
this.formBuilder.group({
items: ['', [Validators.required, Validators.pattern(this.regexValidation.shortWordRegex)]],,
amount: ['', [Validators.required, Validators.pattern(this.regexValidation.amountTypeRegex)]],
});
}
您可以看到调用了createForm函数来发送数据:this.createForm(data),使用日期创建表单.如果调用发送null的函数:this.createForm(null)创建一个Empy表单
You can see that you call the function createForm sending data: this.createForm(data), create the form with the date. If you call the function sending null: this.createForm(null) create a empy form
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