Tag: event-handling

JavaFx: custom event either doesn't get fired or not listened to

Minimal code example: public class HelloApplication extends Application implements EventHandler<HelloApplication.MyEvent> { public class MyEvent extends Event { public static final EventType TYPE = new EventType<>(Event.ANY, "MyType"); public MyEvent() { super(TYPE); } } @Override public void handle(MyEvent myEvent) { System.out.println("Event handled!"); } @Override public void start(Stage stage) throws IOException { BorderPane root = new BorderPane(); stage.setScene(new… Read More JavaFx: custom event either doesn't get fired or not listened to

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how can i get the text from within the div?

const questions = (props) => { const { question, options, id } = props.quiz; const selected = (e) => { e.target.children[0].checked = true; console.log(e.target); }; return ( <div className="bg-gray-200 p-6 m-10 rounded-md"> <div className="font-bold text-xl text-slate-600">{question}</div> <div className="grid grid-cols-2 mt-4"> {options.map((option) => ( <div className="border-2 border-solid border-gray-400 rounded text-gray-500 m-1"> <div className="flex cursor-pointer p-3" id={id}… Read More how can i get the text from within the div?

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Html Form is not taking input on using handlechange event as use state hook

I have created a register page and tried to access the input value using handleChange event but the form is not taking any input. If the ‘value=""’ field of form elements is commented or their values are set null then the form is working. I tried by declaring a global const {name, email, phone, work,… Read More Html Form is not taking input on using handlechange event as use state hook

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Why has the tkinter key-event <Tab> a higher priority than the tkinter key-event <key>?

I am writing an editor (using the tkinter text widget), which replaces tab-characters (inserted by the user) on the fly by 4 blanks. The replacement is done by a binding to the tabulator-key-event ("Tab"), which inserts 4 blanks and returns with "break". Returning with "break" prevents the tabulator-character from being inserted. This works fine. Additionally… Read More Why has the tkinter key-event <Tab> a higher priority than the tkinter key-event <key>?

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How to use useEffect Hook to execute the operation only once?

I wanted to make the modal popup if someone leaves the window. I tried the following code: React.useEffect(() => { const popupWhenLeave = (event) => { if ( event.clientY <= 0 || event.clientX <= 0 || event.clientX >= window.innerWidth || event.clientY >= window.innerHeight ) { handleClickOpen(); } }; document.addEventListener("mouseleave", popupWhenLeave); return () => { document.removeEventListener("mouseleave",… Read More How to use useEffect Hook to execute the operation only once?

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Why JS Event handlers are not working for elements created at runtime?

document.querySelector(“#fire_button_creator_button”).addEventListener(“click”,function () { document.querySelector(“body”).appendChild(document.createElement(“button”)).innerText=”now click me,i am fire button”; }) document.querySelector(“#fire_button_creator_button+button”).addEventListener(“click”,function () { document.querySelector(“p”).innerText=”i am fired”; }) <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <meta http-equiv=”X-UA-Compatible” content=”IE=edge”> <meta name=”viewport” content=”width=device-width, initial-scale=1.0″> <title>Document</title> </head> <body> <button id=”fire_button_creator_button”>fire button creator</button> <p></p> </body> </html> I want to creat a button in runtime that can do somthing. Somthing like… Read More Why JS Event handlers are not working for elements created at runtime?

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How to insert 2 functions into onClick event ReactJS?

<Button onClick={submitHandler}> I have this button which already has an assigned function to its onClick event. I also want to add <Button onClick={() => Toggle()}> this Toggle function into same button. How can I do it? >Solution : Simply create a function which calls both of the functions. Assuming submitHandler needs the event object, that… Read More How to insert 2 functions into onClick event ReactJS?

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Is it possible to sort a list of events?

Suppose I have a class like the below: public class EventClass { public int ExecuteOrder {get; set;} public List<EventHandler> Children {get; set;} public EventClass(int order) { ExecuteOrder = order; Children = new List<EventHandler>(); } public void OnExecute(object sender, EventArgs e) { //Do something… } } And generate some EventClass like the following: public static void… Read More Is it possible to sort a list of events?

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Cannot attach event listeners to a dropzone using .addEventListener method

I am building a simple Drag N drop application demo,draggable was supposed to be dragged over dropzone and could be left there. it is here, https://jsfiddle.net/yuzhangoscar/em4ns5v7/2/ The problem I am having is: I cannot attach callback functions dragoverHandler and dropHandler to element dropzoneOne via .addEventListener() The code snippet would work if I had attached dragoverHandler… Read More Cannot attach event listeners to a dropzone using .addEventListener method

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