Angular view not updating until click

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I can see from my log statements and the network traffic that the JSON data being returned is changing, and my model is being updated, however, the view isn't changing. I can see from the results of console. It might be that the code in your service somehow breaks out of Angular's zone. This breaks change detection. This should work:. For other ways to invoke change detection see Triggering change detection manually in Angular.

It is originally an answer in the comments from Mark Rajcok, But I want to place it here as a tested and worked as a solution using ChangeDetectorRefI see a good point here:. Another alternative is to inject ChangeDetectorRef and call cdRef.

This could be more efficient, since it will not run change detection over the entire component tree like zone. Edit : Using. To solve it you need to unsubscribe before you destroy the component, so the full code will be like:. The view will update itself if a value declared with the Input decorator is changed. If an Input or Output decorator is changed, an ngOnChanges -event will trigger, and the view will update itself with the new value.

You may say that the Input will two-way bind the value. EDIT: after learning more about Angular 2 development, I figured that doing an Input really is not the solution, and as mentioned in the comments. Input only applies when the data is changed by data-binding from outside the component bound data in the parent changed not when the data is changed from code within the component.

In my case, I had a very similar problem. I was updating my view inside a function that was being called by a parent component, and in my parent component I forgot to use ViewChild NameOfMyChieldComponent.

I lost at least 3 hours just for this stupid mistake. Instead of dealing with zones and change detection — let AsyncPipe handle complexity. This will put observable subscription, unsubscription to prevent memory leaks and changes detection on Angular shoulders. Want to add, that it's better to make a service with a method that will take interval argument, and:. Learn more. Angular 2 - View not updating after model changes Ask Question.

Asked 3 years, 11 months ago.The Angular change detection mechanism is much more transparent and easier to reason about than its equivalent in Angular 1. But there are still situations like when doing performance optimizations when we really need to know what's going on under the hood. So let's dig deeper into change detection by going over the following topics:.

Angular can detect when component data changes, and then automatically re-render the view to reflect that change.

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But how can it do so after such a low-level event like the click of a button, that can happen anywhere on the page? To understand how this works, we need to start by realizing that in Javascript the whole runtime is overridable by design. We can override functions in String or Number if we so want. What happens is that Angular at startup time will patch several low-level browser APIs, such as for example addEventListenerwhich is the browser function used to register all browser events, including click handlers.

Angular will replace addEventListener with a new version that does the equivalent of this:. The new version of addEventListener adds more functionality to any event handler: not only the registered callback is called, but Angular is given a chance to run change detection and update the UI.

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It's important to have an idea of what a zone is. A zone is nothing more than an execution context that survives multiple Javascript VM execution turns. It's a generic mechanism which we can use to add extra functionality to the browser. Angular uses Zones internally to trigger change detection, but another possible use would be to do application profiling, or keeping track of long stack traces that run across multiple VM turns.

In fact, many other browser APIs are patched by Zone. Have a look at the Zone. One limitation of this mechanism is that if by some reason an asynchronous browser API is not supported by Zone. This is, for example, the case of IndexedDB callbacks. Each Angular component has an associated change detector, which is created at application startup time. For example, take the following TodoItem component:.

This component will receive a Todo object as input and emit an event if the todo status is toggled. To make the example more interesting, the Todo class contains a nested object:. We can see that Todo has a property owner which is itself an object with two properties: first name and last name. We can actually see at runtime what the change detector looks like!

To see it lets just add some code in the Todo class to trigger a breakpoint when a certain property is accessed.

angular view not updating until click

When the breakpoint hits, we can walk through the stack trace and see change detection in action:. Don't worry, you will never have to debug this code!Resolving problems of your angular application can be very challenging. When your angular app is not working and all it gives you are some cryptic red lines in a console. Especially when you are a beginner, these problems can turn the development process with angular into a real pain. But trust me, it does not have to be painful.

In fact, I think angular development is one of the smoothest development experience I had so far. All you need to do is avoid some very common mistakes, almost every angular developer had to deal with. We will take a closer look at each of 11 mistakes. I will explain to you, why it is actually a mistake and point you in the right direction with at least one possible solution.

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Probably the most common mistakes, beginners make, is not to import the required modules. Because they don't even know about them. Of course, they don't. Getting an overview of the angular framework takes some time. Unfortunately, that often results in mysteriously not working angular applications.

angular view not updating until click

The errors you get look something like this:. This error indicates, that the angular Forms Module has not been imported into your module. This error tells you, that you have not imported the angular HttpClient Module into your root module.

To resolve the problem, you need to import the missing module into your module. Most of the cases, that module would be the AppModule in your app directory. Only import the modules you really need! Importing unnecessarily module bloats your application size significantly. This advice does not only apply to framework angular modules.

It also applies to any angular module you might want to use, including third-party ones. It is good practice for third party libraries to split up in as many modules as possible, to keep the size of your application small.

With Angular Materialfor example, you have to import a module, for every component you use. With the help of the ViewChild decorator, angular makes it very easy to reference specific child elements html nodes or components of your component.

All you need to do is to add a reference identifier to the node or component inside of your template. Just add a followed by a name beside the nodes attributes. We can now reference that element from our component. If it is a component, we can call its public methods and access its properties. If it is a plain HTML element, we can change its style, its attributes or its children.

Angular automatically assigns the reference to a property of our component, if we decorate that property with the ViewChild decorator. Make sure, to pass the reference name to the decorator. For example ViewChild 'myDiv'.

Why shouldn't it? There are multiple reasons why the element you are referencing could not actually exist. The most common reason, is, that the browser has not finished creating it and has not yet added it to the DOM.Binding in AngularJS works magically. When an element in the controller changes the view is updated automatically.

When an input in the view is updated, the controller value is automatically updated. I am working on an app for a client that needed to execute JavaScript code when a binding changes.

I had one view, and controller, which displayed some data filtering options to the user. A second view, and controller, displayed data loaded from the remote services, based on the filtering options. When the filtering elements were changed, a remote service call was made in the filtering view, and the results needed to modify the data view. However, I discovered that when the results came back from the service call, the view was not updating with the new data.

Why is that? To demonstrate watches I'm going to start with a simple application. It will take two inputs from a user; a first name and a last-name. Then it will display the values to the user, updating as the user types. Inside the controller, add some scope variables.

One for the first name and one for the last name:. See this app in action or play with the Plunker. AngularJS binding, with ng-model and the double curly bracket syntax, does not allow you to run JavaScript code when a value changes. It accepts two arguments.

The first is a string, representing the value that you want to watch for changes. This could also be a function that returns the value you want to watch. The second is a function which is executed whenever the value changes. The arguments for the change function are the newValue and the oldValue. For the sake of the example, I just logged the new and old values to the console; however you could perform other functionality, such as instigating a remote service call or other processing.Keep in touch and stay productive with Teams and Officeeven when you're working remotely.

Learn how to collaborate with Office We understand the inconvenience caused and we will try our best to resolve the issue. I suggest you to try resetting the folders on the Windows explorer and check if it helps. Note : We recommend you to not make any changes in the registry, it might effect the System files. Disclaimer : Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly.

Therefore, make sure that you follow these steps carefully.

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For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:. Hope it helps, reply to us with the status of your issue. We will be happy to assist you. Did this solve your problem? Yes No. Sorry this didn't help. As the issue reappears after restarting the System, so it might occur if some of the system files got corrupted.

System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files.

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DISM consolidates the functionality found in those three tools, as well as delivers new functionality to improve the experience of offline servicing. Press the Enter key after each command:.

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But the default was True, so now the default functionality is True with no option to change it? W orking A s D esigned I expect. That's the way bugs are fixed these days--remove the functionality where the bug was observed. No bug, just undocumented WYSIWYG programmed functionality--I can't call it "designed" then but that's how it gets labeled when people want to challenge the decision.

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I just checked on the Feedback app. Nobody has raised the issue there yet. You could be first. Yeah, I saw this issue first raised with 7 then 8 and some people had luck most did not. Not sure if I get why 'luck' resolved it, esp. MS should at least admit they do not know of the fix, that they are aware of it and will keep us informed if a solution is found.

I am even open to being contacted and running test patches, if that is what it takes. Sadly, MS has taken the route of throwing 1, guys monkeys in a room and expecting War and Peace to be written. I was one of the first to raise the flag on the Ethernet issues early last fall.

Months later, MS acknowledged they disabled all ability to modify the adapter then later, admitted there were issues then suddenly, we could modify the adapter and at the same time, the issues went away.

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Similar to the bug where a laptop would not shut completely down and have excessive HD activity and required a hard shut down. Nary a peep about the problem or that they fixed it. Which I discovered, they did.All modern frameworks are designed to help implement UI composition with components.

Naturally you will have a parent-child hierarchy and the framework should provide a way to communicate between the child and parent. I prefer using the first method for the stateless presentational components while I employ DI for the stateful container components.

This article is concerned with the first method. Particularly it explores the underlying mechanism of how Angular updates child input propertie s when parent bound values change.

It continues a series of articles on change detection and builds upon my previous article The mechanics of DOM updates in Angular.

Angularjs scope variable not updating

Since we will be looking how Angular updates input properties for both DOM elements and components it is assumed that you know how Angular represents directives and components internally.

As you probably know Angular provides template syntax for property bindings — []. This syntax is generic so it can be applied for both child components and native DOM elements. Now, whenever the AText property changes on the A component Angular will automatically update the property textContent on B component and span. It will also call ngOnChanges lifecycle hook for the child component. You may be wondering how Angular knows that BComponent and span support textContent binding.

For the components and directives it checks the metadata attached to the class and ensures that bound property is listed in the input decorator property. If the bound property not found the compiler throws an error:. This is a well document functionality and there should be no problem with its understanding. The third is an element definition for the span. One thing that distinguishes this factory from other you may have seen is the parameters that these node definitions take.

This parameter is called props as you may see from the directiveDef function parameters list :.

angular view not updating until click

It is an object with keys where each key defines a bindings index and the property name to update. For our example there will be only one binding for the textContent property:. When Angular creates a directive definition node it uses these values to generate binding for the view node. During change detection each binding determines the type of operation Angular should use to update the node and provides context information. The binding type is set using bindings flags.

In case of property update for each binding the compiler sets the following flags:. And since we also have bindings on the span element, the compiler generates the props parameter supplied to the span element definition as well:.

Angular Change Detection - How Does It Really Work?

For elements this parameter has a bit different structure — an array of props. The span has only one input binding so there is only one child array. The first number in the array specifies the type of operation to be used with the binding — which is property update:. The other possible variants are the following and they are explained in The mechanics of DOM updates in Angular :.

You should be familiar with the second updateRenderer function already from the article about DOM update. The first function is called updateDirectives. These both functions are defined by the ViewUpdateFn interface and both are attached to the view definition:. So why two functions? And these operations are performed at different stages during change detection cycle.

So Angular has two functions each specializing on a particular node definition and calls them at different stages when checking a component:. Both these functions are executed each time Angular performs change detection for a component and the parameters to the function are supplied by the change detection mechanism.Angularjs scope variable not updating in view Controller — Sometimes we face issue with angularjs Scope variable like variables are not updated in view or controller.

Here in this tutorial we are going to explain how you can fix this issue quickly. Hope this will help your problem. April 19, admin. Angularjs uppercase example. Angularjs lowercase example.

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