Form controls values are not updated

[abdulhaq-e]

Hello

I have a problem updating form control values. Using valueUpdates, I'm able to update the value property of the DynamicFormModel. This update however, is not reflected on the form control.

The piece of code responsible for this update is L52-L57. What is happening in my case is that the subject is not pushing any values to the stream. For example, if I change those lines to:

if (this.model instanceof DynamicFormValueControlModel) {
    let model = <DynamicFormValueControlModel<any>> this.model;
    console.log("Do you see me?");
    model.valueUpdates.subscribe(val => console.log("Do you see me now?"))
    this.subscriptions.push(model.valueUpdates.subscribe(val => {
        console.log("What about now?")
        this.onModelValueUpdates(val)
    }));
}

The results: I can only see the first sentence in the log. The others do not appear because the subject has not emitted anything.

[udos86]

@abdulhaq-e I had a quick look before work and in the sample app it's working. You need to update the value via next function of Rx.Subject:

this.exampleModel.valueUpdates.next("My new value");

[abdulhaq-e]

I replicated the code in the sample app and it worked. However, the original issue still exists and I now know what it is.

This line this.exampleModel.valueUpdates.next("My new value"); will have no effect if it's placed inside ngOnit. I've yet to figure out why.

[abdulhaq-e]

Okay, learned something now. The reason the value is not emitted is because the DynamicFormControlComponent has not finished initialising. By setting a time-out in ngOnit the form control value will change:

setTimeOut( () => this.exampleModel.valueUpdates.next("My new value"), 2000);

Now I'll have to figure how to do this programmatically. Probably using lifecycle hooks.

[abdulhaq-e]

import {AfterViewInit} from '@angular/core'

    // component defined here
    ngAfterViewInit() {
      this.exampleModel.valueUpdates.next("My new value")  
}

I always postponed reading about Angular 2 lifecycle hooks. I learned them the hard way.

Thanks.

[udos86]

@abdulhaq-e Alright, no problem! Thanks for the clarification.

[jmaheshTrimble]

Can i update id or any other properties of the control?

[udos86]

@jmaheshTrimble

With the exception of id you can update any property you want.

But be careful when updating values and disabled state (see README).