Angularjs function called multiple times. angularjs-scope I have defined a function on scope.

Angularjs function called multiple times I am using the following code in factory to call the function in controller-A. I Use This To Call One Function on Page Load. Is that so? If it is For some reason, my controller is double called, when I switch between resource 1 and resource2. Tagged with angular, javascript, discuss. Note: each module is only loaded once, even if multiple other modules require it. var starter = angular. But otherwise, I don't want the updateValue () function called so that it doesn't get called with each digit the user enters. Nov 21, 2015 · I am having a really frustrating issue that I can't seem to get to the bottom of. Why is my Onload event handler being called multiple times when injecting code into the browser? Asked 3 years, 10 months ago Modified 3 years, 9 months ago Viewed 1k times Oct 30, 2015 · I can see from the logs (X1, X2). It will be all asserted like called with undefined. This fiddle best shows the issue (though it's v1. I noticed the orderBy function on my ng-repeat is called twice per value I'm repeating over (on first load), I'm not sure why the orderBy function is called multiple times, please check if this is intended behaviour. So I can't use (ngModelChange). $on got executed several times even if it was only a single emit/broadcast. I am noet getting that why is it calling multiple times. I'm finding that the function is being called twice per item rather than once as I'd expect. Nov 22, 2016 · I need to call it each time the method is being called instead of just one time because of how my angular app is working. $emit I am working on a single page app, with angular and I have a need to communicate between 2 different directives which basically don't have a parent child relation. If somebody know why? Apr 8, 2016 · 0 i am calling a function from ng class because i want to return class name dynamically based on price. In my mind function isPageAccessible () should be called only twice, but in the concole I see 4 calling. log('in vehicle item subscruber', obj); multiple times. I have a scope function that gets called and executed multiple times. The link function is called multiple times but as example if want to initialize a third-part library (example maps) this behavior breaks Aug 24, 2015 · I tend to avoid using function calls in html for angular. AngularJS provides us with a dedicated directive for this specific task. By my reckoning, tab () should be called only once because it refers to an anchor link. $emit from another controller, the function inside the $rootScope. In the case of ng-class, it will re-run the function bound to it, to see if anything needs to change. I am sending value only once and by sending value from sidebar component it is calling multiple times. Perhaps this picture clears it up a little! The arrow back from watch list to eval queue is the relevant bit. Where as (change) event is classic HTML DOM event, independent of Angular framework triggered when a change happened in input element. Dec 22, 2021 · If you're using a pipe you'd still calculate the values multiple times but only if the input value of the pipe changes, which reduces the times of re-calculation by a lot compared to function calls in the template. Is that so? If it is Dec 8, 2020 · Is there any way to call call function two times with different argument. Even when i a change a ng-class state (somewhere in my app) it does the calculation. async pipe, make easy to subscribe and unsubscribe from the observable in our templates. Therefore, your $rootScope. Sounds perfect! Mar 27, 2018 · $rootScope. method(); }; will run multiple times is because of Angular's "digest cycle". 2. Oct 28, 2020 · To prevent duplicate HTTP requests when multiple components call the same service, the first response can be shared with all subscribers using specific techniques. Feb 9, 2013 · https://stackoverflow. That is to say, if the debouncing time is 200ms, as long as you keep calling the function and those calls are within a 200ms window of each other, the function won’t get called. Calling a function or initializing a single value on page load in AngularJS is quite easy. Yes using function calls in templates is a bad practice due to it running on every change detection cycle. Sep 8, 2022 · In this article, we will see how to execute/call a JS function on page load using AngularJS. Dec 18, 2016 · I am puzzled, I try to initialize some stuff at application startup, but it seems that the . That's just how angular works (see $digest). Here I can see, that the function first is called twice, then four times - which indicates to me that the digest cycle is triggered multiple time. Mar 21, 2015 · The only thing the function does is in the example is a console. This may be called multiple times before the promise is either resolved or rejected. In all honesty, if your change detection cycle isn't being abused, then it shouldn't call that much, so the fact that your method is being called 1000 times a second seems to suggest you have something in your app Aug 20, 2022 · ngModelChange is the @output property of ngModel directive. It's called at each change detection, potentially multiple times, precisely because the values it uses to compute the result might have changed. that the function gets called multiple times (around 3-to-4 times, depends on how fast you drag across the canvas). So I end up copying the functions 4 times. alert to see how many times it's called. The callbacks are called with a single argument: the result or rejection reason. Jul 11, 2014 · When you do this, your $watch function gets called multiple times per digest; and, if it returns a value, that value gets used, by AngularJS, to determine if your $watch callback should be invoked. When the view loads, I notice that the function is called around 6-8 times. So if you have twice your directive in your view, it will execute the link function two times. The set of HTML will be repeated once per item in a collection. The better approach here is to use observer-observable pattern for example i wrote following code that observes socket client event. Once to get the value, again to see if it has changed. It's how angular magically picks up on changes and keeps data binding working, and it'll run any time there's some user interaction, like a keypress or mouse click. angularjs-scope I have defined a function on scope. Step to reproduce Enter 10 digit number or email example test@gmail. 5 modal component as below. The collection must be an array or an object. anyone can see the code and tell me why the function is getting called 12 time instead of 6. It's better to either use an observable or just a class variable. Mar 7, 2017 · It's normal that it's called a lot of time. Sep 1, 2022 · Angular: Replacing setTimeout () and setInterval () with RXJS Timer and Delay operators setTimeout () and setInterval () works great. Apr 26, 2013 · Doesn't address the question "How do I call an Angular. The Problem I figured out it was because I need the data in several different components. . ngOnChanges still gets called multiple times, but crucially the changes parameter tells us which @Input () caused the call. May 27, 2017 · It's also worth noting here that Sevices can be instantiated multiple times, depending on where you include them in providers arrays. com/questions/37194716/angularjs-function-in-controller-called-multiple-times-by-template This solution is legit and the reasoning makes sense. Jan 29, 2019 · This is the reason why it passes even you are commenting out some of method execution. Say I am on page A, click a link to This Reddit thread discusses the proper use of ng-if in AngularJS, debating whether to call functions or use variables for better coding practices. That means you have to check equality of oldValue and newValue before doing something. The am Aug 14, 2012 · Is there a way to subscribe to events on multiple objects using $watch E. When Angular’s digest cycle runs, every watcher is asked to update its state. and it’s specific to Angular framework. Nov 21, 2013 · On surface everything works fine, but I had to debug something in a function and noticed that it gets called multiple times (to be exact 5 times) even though I am using it only in one place. This is how watches work, and watches are processed every apply-digest cycle! This means watch expressions are called at least once per apply-digest cycle, and at most 10 times, which is the hard limit the Angular team enforces. $on returns and execute it from within the listener callback. if i go to another menu and come back here. In Directive A, I have 2 places Jun 3, 2014 · Applies to Angular 1. If you only need to handle the event once per controller instance, you can save the deregister function that $rootScope. And if instead of {{ test() }} I use {{ ::test() }} as suggested in some other answers I have seen, it gets called only twice (some more progress). Syntax: <element ng-init="function()"> Contents Function Called Multiple Times in AngularJS Repeat SectionI'm running into an issue where I want to bind to the output I'm running into an issue where I want to bind to the output of a function inside of an ng-repeat loop. Jul 8, 2018 · Do you mean the function B and function A works together (parallel)? or first complete function A, then go for function B? If you mean to run the function_b when function a finishes rendering its data, so you could call the function b not when page is loaded, instead once function A finishes its work, call function b. All expression that you use in AngularJS get evaluated multiple times when a digest cycle runs. In the initial call, the function in controller A's function executes 1 time; on the next call the controller-A's function executes 2 times. I'm running into an issue where I want to bind to the output of a function inside of an ng-repeat loop. Can you explain do you have any asynchronous operation there? May 30, 2015 · As Orel mentioned, the cause for the repeated alert is simply that your loginEnabled function is called upon every digest cycle. $on call will be adding a new listener to the $stateChangeStart event each time you enter that state. Seeing "hi" 16 times in my console got me worried. ,Returns a }); } but problem is this that subscriber inside my vehicle-side-list. In this article, we will learn How to Call an AngularJS function inside HTML. if i do it again then trice. data-ng-init="fn_load ()" But I Want To Call More Functions Of Angularjs On Page Load. Aug 7, 2014 · Angularjs freezes in loop suing $timeout to call function multiple times sequential after or less than a second? Asked 10 years, 9 months ago Modified 10 years, 9 months ago Viewed 940 times Feb 20, 2025 · Whenever we watch a function, then this function called multiple times according to digest. Also there is no other place where the controller or webcomponent is called in the code. Nov 7, 2018 · In IE 11, I have an Angularjs 1. We traverse this list to Oct 5, 2016 · When I call this function in the backend it is called more than once. Jun 24, 2020 · In Angular ngFor is directive which accomplishes the motive of displaying repeated or list of contents with least lines of code, this serves the same purpose as for loops in conventional programming languages. It's sufficient to add 1 listener and to use 1 InfoWindow (except you want to have multiple InfoWindow's open at the same time). In such a case as described, how would I best go about generating some value in a link? Is this the best practice? If no, how or could you give me an example on how to refactor the code. But the function is doing some other calculation and it's doing this 16 times. I'm running into an issue where I want to bind to the output of a function inside of an ng-repeat loop. SimpleChanges also happens to provide the old value of the @Input () if there has been multiple changes to that value - pretty handy. HTH! All different types of tracking functions, their syntax, and their support for duplicate items in collections can be found in the ngRepeat expression description. Controller Oct 6, 2015 · The following line in the getCurrentUser function gets called multiple times when the application starts up or page refresh is being done. This is why your controller function runs multiple times, and it’ll run again each time something changes on the page. Now tab () is called six more times, after which the AngularJS events are done. js filter with multiple arguments?" (rather than "How do I call multiple filters?") The ngInclude directive in AngularJS dynamically loads and compiles HTML templates into the current scope, enabling modular and reusable web application development. $watch('item1, item2', function () { }); Oct 22, 2014 · Any function called directly from an expression or indirectly through ngRepeat/ngOptions (and similar) will potentially be called multiple times. Aug 4, 2016 · And I surprised why angular call function isPageAccessible () multiple times. Mar 13, 2019 · I have my code below , doProcess was called many times depending on the myArray. This function can be used to perform initialization. Jun 15, 2018 · Currently have a scenario where a method within a shared service is used by multiple components. Am using the below code Have two arguments like below let dummybody1: any = { Product : &quot;New Product&quot;, } Jun 20, 2016 · newAction is a function you call multiple times? Show the code that surrounds the $rootScope. Dec 2, 2021 · Call The API with RXJS ForkJoin The ForkJoin Operator from RXJS is best when we need to call multiple API calls and combine them and do some calculations or processing before returning the result. of times the listener for broadcast in callFirstFunc. Jul 17, 2023 · It's important to note that when you subscribe () to an Observable multiple times, your subscribers won't listen to the exact same source. Feb 20, 2025 · Whenever we watch a function, then this function called multiple times according to digest. I'd like to call two functions with just one click, how can I do this in angularJS? I thought it'd be straight forward like in CSS when you add multiple classesbut it's not : ( The callSecondFunc is called when the callFirstFunc has been executed, so the listener for this is also called as many no. If user tick checkbox I want to call my someFunction (true) with true value and if user uncheck I want to call the same function someFunction (false) with false value. 1, and sort is called four times!), uncomment the window. How about checking it with called times? Like tryUnsubscribe called 3 times? Oct 28, 2020 · To prevent duplicate HTTP requests when multiple components call the same service, the first response can be shared with all subscribers using specific techniques. Sep 24, 2013 · AngularJS directive binding a function with multiple arguments Asked 12 years, 1 month ago Modified 5 years, 4 months ago Viewed 73k times Jul 20, 2022 · doStuff() } The HTML Part is only called once, so there should be no issue. If you have an collection of objects, the ng-repeat directive is perfect for making a HTML table Unless there is server (api) calls, all the functions above will be executed synchronously. But RXJS offers 2 operators that can do the exact the same job Aug 8, 2013 · As you can see at the plunker below if you have the two functions: ng-click and ng-dblclick And give a double click you will execute: 2 times click and 1 time dblclick Feb 23, 2016 · To use $watch in AngularJS, you need to call the $watch method on the scope object and pass two arguments to it: the name of the variable or expression to watch, and the callback function to Then, the run blocks that have been collected from each module are executed in order of requirement. Whenever the code executes, AngularJS passes-in the current $scope reference as the first argument. This is done for dirty checking which validates whether the current value of expression is different from the last value. This method makes an HTTP call to an endpoint that will always have the same response and returns an Mar 20, 2022 · In Angular is very common suscribe to multiple observables to show data in our template, and use these observables in our template we use multiple async pipe. Mar 10, 2016 · AngularJS - Multiple Directive Instances making XHR call multiple times Asked 9 years, 8 months ago Modified 9 years, 8 months ago Viewed 2k times Dec 15, 2015 · 0 In directive link function is called one time for each directive with the same name angular found. And when I call it from the view inside { {}} it executes X number of times. We can print repeated lines of content based on a number using the javascript/typescript function Array () which will generate a list of number from 0 to n-1. Jan 10, 2016 · If you have created a controller with some functions, and then called one of those functions from a view, you might be wondering “why does the function get called multiple times?” Here’s an example of a controller and a view that might exhibit this behavior: Dec 4, 2018 · Angular Validator function called multiple times Asked 6 years, 11 months ago Modified 6 years, 10 months ago Viewed 6k times Function Called Multiple Times in AngularJS Repeat SectionI'm running into an issue where I want to bind to the output This may be called multiple times before the promise is either resolved or rejected. I don't understand why Oct 20, 2016 · Possible Duplicate of $http is getting called multiple times in AngularJS Sorry I didn't have 50 reputations to comment on the same post. The dragging works fine. Even if you have larger processing, you should still be able to abstract it in such a way that you don't need to use function calls with ng-class. dirLinkVar = function(){ return someService. Definition and Usage The ng-repeat directive repeats a set of HTML, a given number of times. In Directive A, I have 2 places How do I use *ngFor to repeat a HTML element multiple times? For eg: If I have a member variable assigned to 20. This is why your controller function runs multiple times, and it'll run any time something changes on the page Jun 3, 2014 · Subsequent calls that cause the sort to happen only result in a single call per value as expected. Note: Each instance of the repetition is given its own scope, which consist of the current item. arrowup. length , Now the question is how can I keep track if how many times doProcess was called , ive tried using a counter. A lifecycle hook that is called after Angular has fully initialized a component's view. enter, blur, keydown. Jan 10, 2016 · In the case of ng-class, it will re-run the function bound to it, to see if anything needs to change. Right now I'm calling them one at a time on ngOnInit() but I'm looking for a cleaner way to call all 4 functions (GET HTTP Requests) so that they show s There s no clear way to resolve promises multiple times because since it's resolved it's done. Mar 15, 2014 · but the problem is the function gets called as many times as i come back to this router, e. Subsequent calls that cause the sort to happen only result in a single call per value as expected. I am looking for something like Mar 19, 2021 · This is a form of rate limiting in which a function isn’t called until it hasn’t been called again for a certain amount of time. Feb 18, 2025 · What is Async Await in Angular and how to use it to prevent callback hell? Learn the answers in our latest blog post, plus code snippets and more. It also runs on page load. I am facing one issue that get property function call multiple times (4 times). The modal opens and on render event it calls a function outside of the angular app with a callback function contained in this component. By the way I hope you are not calling getDataFromServer multiple times because you will create multiple watchers. module only loads the controller once and the directive only once, so there is no issue. If you want a singleton service, put it in your main module's providers, and if you want per-component services add them to the component directly. Apr 28, 2025 · A Function is a set of statements that takes input, does some specific computation, and produces output. ,Combines multiple promises into a single promise that is resolved when all of the input promises are resolved. May 6, 2015 · In my angular app, directives are working fine during the first visit, but once a page been visited twice, all the directive link function gets called twice too. i have tried below 3 methods in route all with same result in the controller: The reason that scope. Note: the factory function for "values" and "services" is called lazily when the value/service is injected for the first time. module('starter' AngularJS Controllers AngularJS applications are controlled by controllers. Feb 12, 2014 · I have a function which I want to call after page content is loaded. May 29, 2015 · I noticed it when I called it via $rootScope. Then, the run blocks that have been collected from each module are executed in order of requirement. g. 16. How do I use the *ngFor directive to make a div repeat 20 times? Dec 18, 2016 · I am puzzled, I try to initialize some stuff at application startup, but it seems that the . Your first attempt works as expected because you overwrite iw inside the loop. A controller is a JavaScript Object, created by a standard JavaScript object constructor. Sep 8, 2015 · That is, watchExpression should be idempotent'. In this example, i got 2 ng-class, each calling different controller method, for some reason each method get called 3 times, Any idea? Possible bug Mar 21, 2017 · I'm Call Multiple Functions To Load Data In One Page. In this tutorial we will understand the differences between (ngModelChange) and (change) events by going through few examples. I read about $viewContentLoaded and it doesn't work for me. How can i avoid this or how can I stop this? Feb 9, 2013 · https://stackoverflow. run element is called multiple times, every time a page changes. May 11, 2015 · AngularJS event method called multiple times Asked 9 years, 11 months ago Modified 9 years, 11 months ago Viewed 522 times Jan 24, 2016 · +1, in my case, I have an < input > that I want to call a updateValue () function for keyup. Jun 19, 2013 · I have defined a function on scope. MergeMap () This operator takes an input observable, applies a transformation function to each emitted value, and merges the resulting observables into a single output The web development framework for building modern apps. So, why is the listener not called only once, why multiple times? It is looping and increasing every time. com Click In AngularJS, a Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure. Possible solution: Mar 1, 2014 · i have a strange behavior in my code with custom directive. Meaning: First method is being called - dragging will print to the console: Jan 24, 2015 · Many times, when you're experiencing multiple dispatches of an event -- or more specifically, when you've multiple Handlers being invoked then your modules need to utilize locality more. The ng-controller directive defines the application controller. Define an ngAfterViewInit () method to handle any additional initialization tasks. i have tried below 3 methods in route all with same result in the controller: Jan 6, 2021 · While working on my new project, lastfm-with-friends, I noticed that I was making a call to my backend user service multiple times in a single page load. Nov 5, 2019 · This looks a bit verbose but it fixes our problem. Hence the number of times executed get increased for each Sep 9, 2021 · How can I prevent users from submitting a form multiple times? My current issue right now is when the user clicked the submit button multiple times it will create multiple users. i have 6 data and function suppose to call 6 times but when i run the code then i saw it is calling 12 times. the timer would be changed twice. why? On selecting a select option (from directive), I want to trigger filter based on selected value (using two way binding). We are calling the API's using http service and all the ser Oct 11, 2021 · 0 ngOnChanges will get called every time your formName will be changed from the parent component resulting in multiple subscriptions. ,The purpose of the promise object is to allow for interested parties to get access to the result of the deferred task when it completes. My UserService had a function getUser() which simply returned the HttpClient ’s Observable to the components: The reason that scope. The angular. Oct 5, 2016 · When I call this function in the backend it is called more than once. I am a beginner at Angular, from what I have read I think it is the normal, expected behavior. Jun 20, 2016 · newAction is a function you call multiple times? Show the code that surrounds the $rootScope. Registration in the config block Apr 18, 2015 · In this reduced test, my function gets called 3 times (there is some progress ;-). I am using SignalR to push messages to a mobile device and the client method is being fired multiple times. Jun 14, 2019 · Scenario -> on click of a button you need to check data from two functions with (click) attribute. For example, our app shows the user's name and the player stats, each of them came from another api. If you want to call your function only once, you can use attribute firstChange of class SimpleChange. These properties can be a single function that returns the transformed value (function (data, headersGetter, status)) or an array of such transformation functions, which allows you to push or unshift a new transformation function into the transformation chain. And the same thing is happening for the other APIs. Jul 19, 2021 · I have 4 functions similar to the one below. $on called multiple times Asked 7 years ago Modified 7 years ago Viewed 968 times May 7, 2018 · I make a simple demo user login screen . component called multiple times and i got this log console. Only my controller is loaded multiple times. I removed all the duplicate controllers, but the issue persists. The problem is that each time the method is being called - a new event is being added in addition to the previous events. It should create a The web development framework for building modern apps. It's the ng-init directive. log ("hi"). Without going into too much detail, Angular is frequently reevaluating those functions and values bound to the scope to ensure your UI is representing your data accurately. Indeed, they get called only after I stop dragging. If you want to run your function only once, just do your stuff in the "compile" function. Nov 20, 2015 · On page load, my below custom sort filter is getting called multiple times. I have a button with the ng-disable directive attached and a function to evaluate the button state. Nov 25, 2018 · Why my function called multiple times after scanning the barcode through barcode scanner device in angularjs? Asked 6 years, 11 months ago Modified 6 years, 11 months ago Viewed 1k times onLoad happening multiple times with Iframe Asked 8 years, 8 months ago Modified 4 years, 5 months ago Viewed 29k times Sep 9, 2014 · you add the same listener each time you add a marker (Note that a listener will not overwrite previously added listeners). Nov 21, 2017 · 0 In my AngularJS application, I have a controller-A and a factory. arrowdown, and keydown. Additionally, the notify callback may be called zero or more times to provide a progress indication, before the promise is resolved or rejected. $scope. Instead, each subscription triggers a new copy of the defined Observable pipeline. cbjrka ngnfgb mbpw hkyneb svs mvyma nmd bajo xrtg ewjs nybum snfy jzbmirs pexmil mewuoe