ANGULARJS DIRECTIVE SCOPE WATCH NOT FIRING

It is a kind of contacts book. You might want to sign up for my mailing list. If there are multiple variables that you want to watch, you might be tempted to create a watch on every such variable. In order to make it work you have to change the controller code to:. Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

I just forgot to change it back from function to simpler string parameter after testing. It is a kind of contacts book. This is also the reason, you might want to avoid doing such thing. This is because Angular has what is known as a digest-watch cycle where all of this gets figured out:. To watch the properties of your controller, just prefix your variable of interest with the name of your controller! Have you been debugging something that seems trivial in Angular for so long that your face looks like this? Never miss a post Email Address. My code revised to meet these requirements would look like this:.

javascript – AngularJS custom directive $watch not working – Stack Overflow

Sign up using Facebook. It is like an event listener, where the event, in this case, is the changes made to the value of the specified variable. In real app I need to use the directive to do more complex text manipulation than just concatenation. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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My code revised to meet these requirements would look like this:. You might want to sign up for my mailing list.

This is also the reason, you might want to avoid doing such thing. You could also invoke scope. The data is stored in array of objects and I use a custom directive to perform some manipulations with that objects’ text properties. Our controller code on first attempt would look something like this:. It is a kind of contacts book.

You might want to change the name of the property to person, to remind yourself that it is the entire object, not just a string name. This is one of those nasty issues I wish someone would have pointed out to me from the start.

This flag tells Angular to deep watch the object we specify in the service. A user can edit selected person from the list. I send out weekly-ish angulqrjs about hot new tech stuff.

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In order to make it work you have to change the firng code to:. Never miss a post Email Address. I just forgot to change it back from function to simpler string parameter after testing.

direcrive Below is an example which shows how to watch controller properties: To watch the properties of your controller, just prefix your variable of interest with the name of your controller! Sign up using Email and Password.

Ng-ninja | How to $watch controller variables in AngularJS?

I know about a function or string as a first parameter here. Did you enjoy this article? And that is not a very performance-friendly idea.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. When you start to form a basic mental model of how Angular works and you hit your first stumbling block where your model turns out to be incorrect it can be really, really, frustrating.

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You can also follow the full demo on CodePen to get a better understanding. If there are multiple variables that you anghlarjs to watch, you angulafjs be tempted to create a watch on every such variable.

How to $watch controller variables in AngularJS?

But there is an easier way to do that. Notice the controller-as notation, in the above snipped. This is because Angular has what is known as a digest-watch cycle where all of this gets figured out:. Also you won’t need a function to return personName to watch. Have scipe been debugging something that seems trivial in Angular for so long that your face looks like this? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

I am creating a demo application with two controllers communicating through acope service containing some data. During your first foray into Aatch you will probably not come across this as it is one of those hidden, quasi-leaky-abstraction sort of things that only becomes well known to you as you work on getting a non-trivial app off the ground.