Question

我有一个能够添加/删除项目行的表单。每当我想要编辑我的表单时，我都会运行异步调用来获取一些数据，然后相应地修补/设置表单控件的值。一切都按预期工作，但是，对于我的项目行，当我使用Angular 2的patchValue函数时，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！

Answer 1

好吧，为了让这个工作起作用，我实际上将表格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);
      });
  })
}

Answer 2

同样的结果，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)));

)); 
}); 
}

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

2 个答案: