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Angular 2 Forms - 如何在包含对象数组的嵌套Form组上进行patchValue

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在函数中，它只使用对象数组的第一个对象而不是所有对象来修补表单组 .

因此，例如，如果我的表单有3行订单项，例如在发票中，则只会填充第一行 . 谁能告诉我我做错了什么？

这是我的组件功能

constructor() {
    this.createCheckRequestForm();
}

createCheckRequestForm() {
    this.createRequestForm = this._fb.group({
      issued_date: [new Date().toISOString(), [<any>Validators.required]],
      due_date: [new Date().toISOString(), [<any>Validators.required]],
      invoice_number: ['', [<any>Validators.required]],
      how_to_send: ['Mail', [<any>Validators.required]],
      normal_processing: ['', []],
      is_corporation: ['', []],
      line_items: this._fb.array([this.initLineItem()])
    });
  }

  /**
   *  Init the line item for the form builder
   */
  initLineItem(options?) {
    return this._fb.group({
        description: ['', []],
        coding: ['', []],
        amount: ['', []],
        line_item_types: [[], []]
    });
  }


populateFormWithRequest(requestId) {
    this.formPopulationObs = this._checkRequests.getRequest(requestId).subscribe(requestData => {




      // Iterate through the line items and patch them
      let lineItems = [];
      requestData.line_items.forEach((lineItem, index) => {

        let lineItemTypes = [];
        if(lineItem.line_item_types) {
          lineItemTypes = lineItem.line_item_types;
        }

        // Separate key-store for the coding dropdown models
        this.lineItemCodings[index] = lineItem.coding;

        let lineItemObj = {
          description: lineItem.description,
          coding: lineItem.coding,
          amount: lineItem.amount,
          line_item_types: lineItemTypes,
        }
        lineItems.push(lineItemObj);
      })

      this.createRequestForm.patchValue({line_items: lineItems});
  })
}

如果我有这样的数组，只有第一个元素出现在“补丁”中

[ 
 {amount: "600", coding: "-Kfxw732pfWUS5rU0TRu", description: "Cameras"},
 {amount: "600", coding: "-Kfxw732pfWUS5rU0TRu", description: "Lights"}
]

提前致谢！

angular angular2-forms

2 回答

  • 3

    好吧，所以为了让它工作，我实际上将表单组数组元素推送到已经存在的“line_items”控件上然后修补值 . 这是我更新的功能：

    populateFormWithRequest(requestId) {
    this.formPopulationObs = this._checkRequests.getRequest(requestId).subscribe(requestData => {


      // Iterate through the line items and patch them
      requestData.line_items.forEach((lineItem, index) => {

        let lineItemTypes = [];
        if(lineItem.line_item_types) {
          lineItemTypes = lineItem.line_item_types;
        }

        // Create the item obj
        let lineItemObj = {
          description: lineItem.description,
          coding: lineItem.coding,
          amount: lineItem.amount,
          line_item_types: lineItemTypes,
        }

        const control = <FormArray>this.createRequestForm.controls['line_items'];
        control.push(this.initLineItem());
        control.at(index).patchValue(lineItemObj);
      });
  })
}
    回复于
  • 0

    相同的结果，更容易一点 - 没有创建一个空项并覆盖它：

    populateFormWithRequest(requestId) { 
  this.formPopulationObs = this._checkRequests.getRequest(requestId).subscribe(requestData => { 
    this.createRequestForm["line_items"] = 

requestData.line_items.forEach(itm=>(<FormArray>this.createRequestForm["line_items"]).push(this.createRequestForm.group(itm)));

)); 
}); 
}
    回复于

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