何时何地调用 updateValueAndValidity？

Question

我不清楚应该在何时何地调用 updateValueAndValidity.

假设我有一个包含许多 formControl 的 formGroup。现在，基于某些单选选项选择，将触发一个事件来修改多个 formControl 的 'validators'。

Q1：我是在修改后立即调用updateValueAndValidity还是在所有修改调用完成后调用？

Q2：我是不是要通过表单更新formGroup/formControls来更新所有的formControls

this.form.updateValueAndValidity('emitEvent': false);

或单独调用每个 formControls

this.form.get('control1').updateValueAndValidity('emitEvent': false);
this.form.get('control3').updateValueAndValidity('emitEvent': false);
this.form.get('control8').updateValueAndValidity('emitEvent': false);

Answer 1

为了安全起见，您需要调用所有控件的更新

在这个答案中你可以看到这个函数（updateValueAndValidity）更新父

urrently it seems to be doing the following (this list is based on method names):

'Set initial status' - which makes .status 'VALID' except if ALL controls are disabled, in which case it makes it 'DISABLED'

'Updates value' - this seems to set .value if the control is enabled, or clear it if disabled.

'Runs validator' - this updates the whole error object. So custom errors would be cleared if you'd set any.

'Cancel subscriptions' - stops any async validators running at the time

'Emit' event - (if emitEvent != false in options). This is just the value and status normal form events.

Updates parent with same rules - unless onlySelf is set.

Note: it doesn't go down the tree, only up.

注意行 它不会沿着树向下，只会向上 所以如果你调用 form 上的函数，controls 可能没有所需的行为，但更新控件将反映在表单上

尽管可能很麻烦，但您需要更新每个控件的值和有效性

何时何地调用 updateValueAndValidity？

When and where to call updateValueAndValidity?

validation

angular

angular2-form-validation