FormArray返回为FormControl而不是FormArray

本文介绍了FormArray返回为FormControl而不是FormArray的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在使用Angular反应形式的嵌套FormArray时遇到了麻烦.我的一个表单数组正确返回为FormArray，另一个返回为FormControl.在initialMaterials()函数中，我有两个console.logs. console.log(control)返回一个FormControl项，而 console.log(this.objectServiceJobsArray)返回一个FormArray.

I'm having trouble with nested FormArrays in Angular reactive forms. One of my form arrays correctly returns as a FormArray and the other returns as FormControl. In the initialMaterials() function I have two console.logs. console.log(control) returns a FormControl item and console.log(this.objectServiceJobsArray) returns a FormArray.

我需要能够向阵列中的特定作业添加材料，并在必要时以表格的形式对其进行更改.

I need to be able to add materials to specific jobs in the array and change them in the form when necessary.

this.objectServiceForm = this.formBuilder.group({
          onHolidays: [this.objectService.onHolidays],
          objectServiceJobs: this.formBuilder.array([this.objectServiceJobs()]),
          isBillable: [this.objectService.isBillable],
          defaultPrice: [this.objectService.defaultPrice],
          pricePerHour: [this.objectService.pricePerHour],
          doneWeekly: [this.doneWeekly],
        });

objectServiceJobs(): FormGroup {
    return this.formBuilder.group({
      job: [''],
      workDetail: [''],
      competentWorkers: [[]],
      materials: this.formBuilder.array([this.objectServiceJobMaterials()])
    });
}

objectServiceJobMaterials(): FormGroup {
    return this.formBuilder.group({
      material: [null],
      quantity: [null]
    });
}

initialMaterials(job) {
    const index = (<FormArray>this.objectServiceForm.get('objectServiceJobs')).controls.findIndex(x => x.value.job.id === job.id);
    const control = (<FormArray>this.objectServiceForm.controls['objectServiceJobs']).at(index).get('materials') as FormArray;
    console.log(control);
    console.log(this.objectServiceJobsArray);

    // job.materials.forEach(mat => {
    //   this.objectServiceJobsArray[index].materials.push(this.makeMaterialFormGroup(mat));
    // });
}

推荐答案

我在IDE中尝试了您的代码，但是更改了提取控件的样式，并且可以看到console.log(control)使我返回为FormArray.

I tried your code in my IDE but changed the style of extracting controls and I can see that console.log(control) returns me as FormArray.

initialMaterials(job) {
    const objectServiceJobs = this.objectServiceForm.get('objectServiceJobs') as FormArray;
    const index = objectServiceJobs.controls.findIndex(x => x.value.job.id === job.id);
    const control = objectServiceJobs.at(index).get('materials') as FormArray;
    console.log(control);
  }

这篇关于FormArray返回为FormControl而不是FormArray的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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