Tag: event-handling

How to make complete form in which background color of button changes when user starts typing in input field with javascript , html and css?

css event-handling html javascript jquery

Now the issue is that it only works for one input and the associated button field it does not work for another pair of input field and button , so what changes should i make in the above javascript code in which it runs for as many as input field and button i want? Please can anyone help me in

How to remove an eventListener (window.removeEventListener) in Vue 2, when certain condition is met

event-handling event-listener javascript vue.js vuejs2

Code :- In the above code, I want to stop listening for the scroll event with onScroll method when my if block in onScroll method becomes true. But, still, the onScroll method gets called whenever I scroll even though when I tried to remove the eventListener. I even created a watcher to remove the eventListener, yet the method keeps on

How to change the data stored in LocalStorage when clicking on element in react?

event-handling javascript local-storage reactjs

I am creating to-do app in react, and storing the data in localstorage,when user click on particular task it is mark completed, for that purpose i have “complete” boolean property for all task in localStorage.now i want to change that property onclick of that particular task,How to achieve this?.Here is the code link : https://github.com/Khatri-Jinal/react-app/tree/practical4 Answer I suggest you make

JS remove event listener with no condition?

canvas event-handling html5-canvas javascript

I have the following code As you can see the resize event listener recursively calls setSize(). I did this so that I could handle initial size setup and window resizing in the same function. The problem is that every recurse will add an additional eventListener, rather than replacing the last. So I need to remove the resize event listener on

Decrement function in Reactjs doesn’t work

event-handling javascript reactjs

I am using ReactJs and React-dom in 17.02 version. I had the same problem described in this question: a value to increment and decrement using button. I used the solution proposed, changed my previous code. From this one: To this one: But I see this error in the console TypeError: Cannot read properties of undefined (reading ‘quantità’) I know the

JS event listeners stop working during item drag, only fire after pointerup and subsequent mousemove

event-handling javascript mouseevent

I am having trouble getting event listeners to fire when the actual event occurs. I have created a drag-and-drop system that sets a variable hoveringOverTarget = true on pointerover of the target, listens for pointerdown on an image, and then calls a function on pointerup to check if it’s been released over the target. However, during dragging of the image,

React state not changing after clicking some button

asynchronous axios event-handling javascript reactjs

After invoking handleButton by pressing the Log In button once, the value of logInStatus is empty. However, after the second click,the value of logInStatus will change. I know that setState is an async call, so it will not update the value of logInStatus instantly. How should I approach a solution? Answer Edit, I will not remove the first paragraph bellow,

“event” in Javascript is deprecated and I cannot use “preventDefault()”

dom-events event-handling forms javascript preventdefault

I am trying to use the event.preventDefault() method but I am continuously receiving error. It says that event has been deprecated. I am making a Firebase SignUp form and I want to prevent the form from Submitting. Here is the complete code. And the useInput code: Answer What that warning means is that the global variable window.event is deprecated. You

TypeError: unshift is not a function

arrays event-handling javascript object reactjs

I have todos array of objects passed as props to a TodoList component. I’m trying to add a new object to the array of objects. I created a method called addTodo which adds the first todo’s object & when I tried to add the second todo it fails with the error: TypeError: this.state.todos.unshift is not a function. Two questions: Why

Is there a way to add ‘live’ Event listener for mouseenter event type with pure JS

dom-events event-handling javascript mouseevent

I’m trying to add a live version of event listener in pure JavaScript to monitor a mouseenter event in order to execute specific function each time the user enters his mouse on specific element. Here is what I have, but it’s not continuously monitoring the mouseenter: the goal is to keep listening to this event even after DOM update Any