angular2 rc6-如何在事件中更改反应性FormControl值

Question

This is how I set my form in rc6:

this.myForm = fb.group({
                lambda: new FormControl({value: .94, disabled: true}, Validators.required),
                //lambda: ['',[Validators.required]],
                radio11: ['es',[Validators.required]],
                startdate: ['',[Validators.required]],
                enddate: ['',[Validators.required]]
        })

So on form changes I subscribe to events and based on a condition I want to change a disabled field from true to false:

this.myForm.valueChanges.do(formValue=>{
            console.log(formValue);
            console.log(formValue.radio11);
            if (formValue.radio11=='es'){
                console.log(this.myForm.controls.lambda.disabled);
            }
        }).subscribe();

For example if I set the below to false I get the below error

this.myForm.controls.lambda.disabled=false 

core.umd.js:5995 EXCEPTION: Uncaught (in promise): Error: Error in app/model_parameters_general/model_parameters_general.component.html:19:27 caused by: Cannot set property disabled of #<AbstractControl> which has only a getter

Answer 1

您可以使用AbstractControl的enable（）和disable（）方法

this.myForm.controls.lambda.enable();

Answer 2

You use: this.myForm.value.lambda to get the value of the field in question. To set the value do:

(<FormControl> this.myform.controls['lambda']).setValue(false);