Javascript function called twice I have a variable that store the last message Id, so, every RetrieveMessage call retrieve only the messages that is unread. Feb 4, 2010 · I have a Client timer which call the webservice Function RetrieveMessages () every second. if it is called more than once, than the event is registered multiple times and hence it will also fire multipletimes. apply(this, arguments) ensures that our callback is called with the same this value and arguments as the original callback, so onlyAllowOneCall doesn't change the behavior of the callback. Any code at the top level of the file runs in both phases. The problem is not why it is not called but it gets called twice? So there isn't any syntax issue in the code. May 14, 2022 · 280 useEffect being called twice on mount is normal since React version 18 when you are in development with StrictMode. But it is not specified anywhere that StrictMode cause useEffect to run twice too. I. Can someone help me understand why this is happening? Feb 19, 2015 · I'm looking for a function has to be called once when the user clicks on it, but for some reason Cordova executes it once, twice or even three times. Jan 23, 2022 · I am trying to understand a tutorial about function sequencing on 'w3schools - Lesson: JS Async', but i am stuck at the below example. and with jquery append method a dom element is being added with that class name. Execution occurs twice for the code after the "await 1" statement within the async function. Additionally, soon after the user send a message i'm call de same function RetrieveMessages (). Jul 2, 2022 · Same issue tried above. ready() Javascript function. series() but if there a way to prevent the call from inside busFrame itself, it could reduce any possible errors. , the click event on element el will register once and, thus, fire once. The custom plugin require callback function as it's parameter. . loadMoreFeeds() function is called once when a Mar 25, 2019 · I am toggling visibility of a modal in react based on result of some logic performed in saga middleware by dispatching action from saga. it is with an aspx file. js as shown below. Somewhat like pagination. I think I’ll go read and learn what that even means! Edit: Actually, it seems to still have the intermittent issue of running twice. May 1, 2015 · Supose I have a function that calls the same function twice, with differents parameter each time, some like this: function one(){ two(a,b); two(c,d); } When I call function one, only the Jun 12, 2018 · Why is my function being called twice in React? Asked 7 years, 5 months ago Modified 1 year, 3 months ago Viewed 119k times Feb 8, 2018 · The function is not called twice in your snippet. I'm assuming this is because the focus change fires the onchange()?. el. If that doesn't work, move the debugger statement to right above this line: May 6, 2021 · Function called twice on page load or only when refreshed Asked 3 years, 11 months ago Modified 3 years, 11 months ago Viewed 2k times Aug 12, 2014 · It is calling twice because the button is inside a span and span has onclick="alert('Boem')", hence when you trigger click on the button then it shows an alert and the same click event propagates to span and shows the alert once again. If that were the case, then "Step 1 for React component" would be output twice. Here is an overview of the reason from the doc: In the future, we’d like to add a feature that allows React to add and remove sections of the UI while preserving state. Debugger is very useful, I wasn't aware of this keyword. Mar 2, 2011 · A working example is here on jFiddle The onchange gets called twice: The myOnChange function is called, makes the new input, calls the focus(), the myOnChange gets called again, makes a new input, the 'inner' myOnChange exits and then the 'outer' myOnchange exits. map(), case "INCREASE_QTY": console. However, fetchQuery() was getting called twice. I have tried debugging and found out that the reducer is only being called once but the ipcRenderer function is being called twice. Can anyone explain me why that is? var playAsUser = function(){ var hand = new Sep 24, 2016 · In 4 minutes, i correctly get "call Jane" (this one gets set from the bot code) One minute later, I correctly get "call Bob", but also i get "call Jane" (which should not happen until 8 hours later) I printed all the timeout values and they seem correct. but this time function is calling twice. This function always runs 2 times, even when a call it just once. May 2, 2021 · It doesn’t run twice, the function at the top runs once. All Functions are Methods In JavaScript all functions are object methods. Actually i want to submit a form on clicking a link using post method so i am trying to do the below- Jul 8, 2020 · Whenever, I click the button to show the open the dialog box, it appears twice, one after the other. So I'm looking for a way to prevent this from happening. I'm assuming there's more code we haven't seen, which calls myFunction; the purpose of calling the function twice would then be to show the effect of the sorting function. Why do you think it runs twice? edit, sorry I though you were calling the second function as an alert as well Also, you’re in a forum, you need to give it time. click (function () { $ (& I haven't taken the time yet to fully understand why that caused the document. Apr 15, 2018 · This seems to have solved it. You have to store the results to a variable which gets rendered in your component. If you have a JS function that is called twice, apparently the Jan 22, 2017 · If the function has been called before we'll throw an error, otherwise we call the original function fn. Meaning that function is going to get called on every render. The example below creates an object with 3 properties, firstName, lastName, fullName. fn. Three approaches depending on exactly the behavior you want: Throttle (prevent a function from being called more than n times in a given timespan) Debounce (delay execution of function until a certain amount of time has passed since the last invocation attempt) Jul 9, 2014 · I'm trying to work on a script, that makes ajax request to pull more feeds from the server. You can also keep track of the function calls to find out how many times it is called in the whole code using the below approaches. You're calling a function in the template that is returned. Something like this: class App extends Component { constructor() { super(); this. The Problem: Function Running Twice In the provided JavaScript code, a function named getClipFile is intended to execute only once after a bash script has completed running. I found out that if I were to write the same function twice, the code still ex Nov 16, 2014 · Im new to jquery. state = { data Mar 14, 2021 · I am trying to create a user with email and password using firebase, but when I call the function that creates it, it is called twice and I get an error because I am trying to register the email that is already in use. Mar 12, 2019 · 2 Well, when your constructor and your componentDidMount function both fire twice you can be sure that the component in question is constructed twice somewhere. Create another function which will do the same and call it from the onchange event (or) create the onchange listener programmatically. Nov 29, 2013 · 1 Assuming you have attached an event listener to the button, one approach is to just remove the event listener from the button and attach it afterwards again if needed. If a function is not a method of a JavaScript object, it is a function of the global object (see previous chapter). Dec 18, 2024 · Why is catch function called twice on the same promise? Asked 10 months ago Modified 10 months ago Viewed 125 times Feb 19, 2022 · That's totally unexpected to me. ready (function () {} is getting called twice. I also am printing the return of the setTimeout () function inside the issueAlarm () function. Apr 25, 2020 · ReactJS onClick function called twice Asked 5 years, 1 month ago Modified 5 years, 1 month ago Viewed 3k times Hello! I have 2 simple example functions to showcase my issue. People will help, but you can’t just demand it – it could take a few hours before someone replies, you just need to be patient. I'm confused as to why the console is out-putting my log calls multiple times. and i want to call that again to work that function again. e. Aug 24, 2016 · I have problem when create custom JQuery plugin that will show Bootstrap modal dialog. module. button () . While it’s registered once in the DOM, the event appears to execute twice during an actual click. ready function to be called twice, but it did. Mar 29, 2021 · I wonder why the event handler is called twice, regardless I use addEventListener("click",onclick, true); or addEventListener("click",onclick,false); I use Firefox browser. please check below code for understanding. Aug 6, 2022 · Is this in development? useEffect is always called twice in development with strict mode, to check for possible bugs. RequestAnimationFrame throttling When a function is used to render animation or calculate the positions of elements, we can use RequestAnimationFrame to prevent it from being fired too many times. Strict Mode is used to detect if we are doing side effect in any function which should be pure so only those functions that needed to be pure are run twice but as useEffect can contain side effects it should be run twice in Strict Mode. Nov 17, 2022 · How to Prevent a Function From Being Called Multiple Times If you use an event handler such as onClick, onChange, or onScroll and want to prevent the callback from being fired too quickly, then you … Jul 6, 2022 · Why Is My Function Being Called Multiple Times? Hello, I am a self-taught beginner and I am trying to write a web app. The problem here is SiteHelper. My first function prompts the user for a string input and then it checks if their input includes the correct choice (dog in this case) and a second function (which is the one we call to run the game) calls function one, checks the return value from function one, and keeps score. stopPropagation). If you use template inheritance like extends in Django, most probably you have included May 12, 2025 · Animation in JavaScript function only runs once even when called twice Asked 1 month ago Modified 1 month ago Viewed 75 times Feb 22, 2010 · Recently we found ourselves having a really weird problem on a project: Every time a page was loaded it seemed a bunch of different Javascript functions were being called multiple times and making many widgets on the page break and we couldn’t figure it out. Note: Anyways, don't call the function twice from the inline attribute. I have a function to return the angular scope. Jul 23, 2025 · In JavaScript, a function can be called multiple times wherever you need the same kind of functionality. I have written a jquery function to process some form inputs. exports = { fetchQu This can be caused for following reasons: You have included the script more than once in the same html file You have added the event listener twice (eg: using onclick attribute on the element and also with jquery The event is bubbled up to some parent element. Jul 5, 2013 · I am trying to call a javascript function on clicking a link. How do I prevent this called-twice-from-React behavior? Jan 8, 2014 · JavaScript function getting called twice on Enter key press Asked 11 years, 5 months ago Modified 11 years, 5 months ago Viewed 7k times Feb 13, 2024 · Troubleshooting JavaScript Click Event Triggering Twice (EIS) The JavaScript click event is being triggered twice, despite being defined and initialized only once in the code. i called that function in document ready. After clicking an element with a class name, i want to do something. To do so, add the following code in the event listener function itself: Feb 20, 2013 · we do not know whether the function "pushingBetButtons" is called only once or multiple times. For some reason, it gets called twice, even Jul 4, 2020 · I'm new to JavaScript and I'm running a wiki for a Discord bot on Github Pages, and when I try to update the page with code from my pre-made JSON file, it has to be run twice in order to function correctly, it is currently here and I used the console to run the function. Some of the functions were our own code, some part […] Mar 13, 2024 · Your function is called twice because Playwright loads the test file twice: first to discover the tests, second to run them. Jun 11, 2021 · Show activity on this post. As fl00r indicated, it would be helpful to see more of your code. Double function calls are often a symptom of unintentionally attaching your handler twice. It didn’t seem to at first, so I thought it was fixed! Whoops. Jun 29, 2015 · The javascript code sits within script tag "<script language="Javascript"> . Jun 25, 2012 · I know it is quite a common issue, but even with research I was not able to understand what goes wrong in my call to document. The problem are when modal dialog called twice, Oct 31, 2021 · I was requesting data from a GraphQL server using fetch function in a file which I called fetching. I know i could make my calls to the function busFrame using async. I see an strange issue that my $ (document). Aug 22, 2014 · The stack trace will let you see exactly where a function was called from, so you can see if it is being called from two different points. (you may consider using event. Sep 19, 2018 · The following function creates a table based on the data received from an API request. github link Can someone please explain why onClick function run twice but the value of Qty was updated only 1 time? the console showed onClick triggered 2 times, but the qty only increased by one as I clicked 1 time only the tutorial code is using Array. Frame Recieved I want to prevent the function to be called more then once in the same time and any other call should be delayed until the first call is returned. The script tag is appending twice for some reason, i think that's why it is being called twice. log("Increase Qty"); const tempCart . Adding the closing table tag fixed this issue. But given that the purpose of the function is to only ensure that the locale is loaded, it would be perfectly fine for the user to invoke it several times. Note - the async function isn't called twice. I went through: Action is being dispatched twice on github Oct 1, 2014 · For some reason, the event listener is firing twice for each element when passing arguments into an anonymous function. I have corrected the errors and can see the console printing the log twice when they called. even if button is clicked just once. Mar 11, 2015 · java-script function is called twice Asked 9 years, 11 months ago Modified 9 years, 11 months ago Viewed 678 times When elemen is clicked, will the function func be called twice, or just once? If it is called twice, then is there a solution to check if the same event listener already exists on elemen? May 12, 2017 · Great, thanks. I'm currently just storing a single promise and resolve it if the user calls the function again after the locale has been successfully retrieved from the server. $ ("#link_button") . Jul 18, 2011 · I setup a link element and called its click event in jQuery but the click event is calling twice, please see below the code of jQuery. It can be called successfully the first time, but any calls afterward result in Uncaught TypeError: contac Mar 3, 2023 · Hi, I have some questions while doing the Shopping Cart project. The method you use to pass values between functions better practice (aside for ES 2015 caveat) than my method of calling the function within a function? Is that setInterval() call in some function that might get called more than once? I have a javascript file in which I write a bunch of jquery functions. 6 days ago · setState being called twice in a function called once? why? Asked 5 years, 5 months ago Modified today Viewed 20k times May 20, 2022 · Using Lodash debounce method in ReactJS is better done by wrapping it in a useRef function, since this keeps track of debounced functions and prevents the creation of them on every render. mdotv naseb jtkdlh favfcz sxhcsyn ikz inzba cvvmgqo hwvz lrqfqfzb tlz ckxxt hkjgav bqkfc amrb