Question

我注意到，当我尝试通过HTTPclient提交FormBuilder中的几个值时，我的值没有更新。当我第二次运行提交时，这些值会更新。

private mergeDates(dateValue: string, timeValue: string): string {
  const returnValue = dateValue.toString().replace(' 00:00', ` ${timeValue}`);
  return returnValue;
}

private submitVacancy() {
  if (this.vacancyForm.invalid) {
    return;
  }
  const fValue = this.vacancyForm.value;
  const fControls = this.vacancyForm.controls;
  fControls['beginDateTime'].setValue(
    this.mergeDates(fValue['beginDate'], fValue['beginTime']),
  );
  fControls['endDateTime'].setValue(
    this.mergeDates(fValue['beginDate'], fValue['endTime']),
  );
  alert(JSON.stringify(fValue));
  this.http.post(`${this.apiUri}/addvacancy`, JSON.stringify(fValue));
}

Answer 1

我像Mateusz建议的那样在代码中添加了以下行，现在可以正常工作了。我的代码现在看起来像这样。

public static long noOfCombinations(int n, int m){

    //this part is for fewer multiplications
    //b/c 4 out of 6 has the same number of combinations as 2 out of 6
    if (m > n) {
        return 0;
    } else {
        if ((n - m) > m) {
            return noOfCombinations(n, (n - m));
        }
    }

    long numerator = 1;
    long denominator = 1;

    //these two loops are for partial factorial
    for (int i = n; i > m; i--) {
        numerator *= i;
    }

    for (int i = (n - m); i > 1; i--) {
        denominator *= i;
    }

    // no of combinations
    return numerator / denominator;
}

我运行private mergeDates(dateValue: string, timeValue: string): string { const returnValue = dateValue.toString().replace(' 00:00', ` ${timeValue}`); return returnValue; } private submitVacancy() { if (this.vacancyForm.invalid) { return; } const fControls = this.vacancyForm.controls; let fValue = this.vacancyForm.value; fControls['beginDateTime'].setValue( this.mergeDates(fValue['beginDate'], fValue['beginTime']), ); fControls['endDateTime'].setValue( this.mergeDates(fValue['beginDate'], fValue['endTime']), ); fValue = this.vacancyForm.value; alert(JSON.stringify(fValue)); console.log(JSON.stringify(fValue)); this.http.post(`${this.apiUri}/vacancy`, JSON.stringify(fValue)); }之后立即添加了fValue = this.vacancyForm.value;。

使用Angular 6更新表单值时的延迟

1 个答案: