In object-oriented programming languages (such as C++, Lazarus Pascal or Visual Basic), visual objects (or components) can respond to *events* (usually) by the user. An event handler is the block of code that runs when an event occurs. Eg: *Onclick* event for a command button.
Questions tagged [eventhandler]
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Use default event in a single element when default action is prevented for document in javascript
I have an onMousedown and an onMouseup eventhandler on the document that prevents default event.
Now there is a single form element (a select field) where I want to use the default action. Can I somehow call it from javascript?
Something like:
…
Big Bene
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javascript cannot read property '0' of undefined
I'm initializing my var like this at the top of my .js file:
var angle = 0;
And then I add an event handler to detect key pressing and increase that variable:
document.addEventListener("keydown",
function (event) {
switch…
Oscar Sales Salvador
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2 answers
Can somebody explain to me what this does?
So, I'm quite new to C# programming, and I had a friend help me out. He made this code:
private void Form1_Shown(object sender, EventArgs e)
{
System.Timers.Timer t = new System.Timers.Timer(50);
t.Elapsed += t_Elapsed;
…
Neebz
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3 answers
C# label should do diffrent things when clicked
I need a label which does something different with every click.
private void open_Click(object sender, EventArgs e)
{
for (int i = 0; i < 5; i++)
{
builder = new StringBuilder(4);
…
aha364636
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Javascript and onMouseOver
I have created a script, which holds a div-container. The moment i move the mouse quickly left and right on the container, it does not work anymore. Google Chrome does not process it properly either, why?
move…</div>
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<h3><a href="../../questions/28072771/how-to-do-form-field-repetition-in-javascript" class="question-hyperlink">How to do form field repetition in JavaScript?</a></h3>
<div class="excerpt">I got a form with a list of games I'm asking people to add that they've played.
It says "Add Game" with a hyperlink which has an event handler onClick which directs to a JavaScript function - it only does this once but I want it to do this as many…</div>
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<h3><a href="../../questions/27684761/highcharts-event-handler-for-stockchart" class="question-hyperlink">highcharts event handler for StockChart</a></h3>
<div class="excerpt">I was looking at http://api.highcharts.com/highstock#chart.events.
I want a event handler to capture event when ever there is a change in the date range.
This change in the date should be captured for all changes in date. For e.g. when the a button…</div>
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<h3><a href="../../questions/26594520/trouble-raising-events-from-c-to-be-handled-in-c" class="question-hyperlink">Trouble raising events from C++ to be handled in C#</a></h3>
<div class="excerpt">I'm trying to write a C#-based WPF application that uses a C++ DLL. The C# application is for the user interface and it has all advantages of WPF. The C++ DLL uses Win32 functions (for example to enumerate windows).
Now I want the C++ DLL to raise…</div>
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<h3><a href="../../questions/25436764/how-to-get-all-the-controls-on-a-net-application-dynamically" class="question-hyperlink">How to get all the controls on a .Net Application dynamically?</a></h3>
<div class="excerpt">I have been researching from the past couple days on how to write a method in C# that can dynamically get all the controls while clicked on a .Net Application. Most of the examples out there are on buttons that you specify for example
ctl.MouseClick…</div>
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<h3><a href="../../questions/24653255/save-data-to-popupmenu" class="question-hyperlink">save data to popupmenu</a></h3>
<div class="excerpt">I have a popup-menu that has an option, add own material, and when this is chosen, a pushbutton is enabled that say SAVE. I alose have a bunch of edit-boxes.
What I want to do is to make a callback so whenever I click the SAVE, the data from one of…</div>
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<h3><a href="../../questions/17865795/on-c-the-mousehover-on-a-picturebox-appear-to-do-nothing-do-i-need-some-kind-o" class="question-hyperlink">On c# the mousehover on a picturebox appear to do nothing.Do i need some kind of eventhandler?</a></h3>
<div class="excerpt">I am trying to create a MouseHover event for a pictureBox, but I have had no luck so far:
private void pictureBox1_MouseHover(object sender, EventArgs e)
{
pictureBox1.Image = ArgyroCinema.Properties.Resources.ktz00h07;
label1.Text =…</div>
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<h3><a href="../../questions/76178507/javafx-help-setting-event-listeners-to-set-variables-and-print-text" class="question-hyperlink">JavaFX: Help setting event listeners to set variables and print text?</a></h3>
<div class="excerpt">I am writing a program that is a "sandwich ordering app". Think subway. Bread choice, meat choice, cheese choice, etc. I'm trying to use each type of element (radio buttons, combobox, slider, listview, checkbox, and textfield). I am having trouble…</div>
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<h3><a href="../../questions/75657115/is-the-following-code-in-c-cause-memory-leak-issue" class="question-hyperlink">Is the following code in c# cause memory leak issue?</a></h3>
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using System;
namespace ConsoleApplicationTest
{
internal class Program
{
static void Main(string[] args)
{
CreateMemoryLeak();
…</div>
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<time class="s-user-card--time" datetime="asked Mar 07 '23 at 00:46">asked Mar 07 '23 at 00:46</time>
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<h3><a href="../../questions/68979129/c-how-do-i-unsubscribe-a-private-method-subscribed-to-an-event-from-it-s-deriv" class="question-hyperlink">c# How do I unsubscribe a private method subscribed to an event from it's derived class?</a></h3>
<div class="excerpt">How do we unsubscribe a private method subscribed to an event from it's derived class?
For eg:
Base Class :
class Base1
{
public Command Comm;
public Base1(){
Comm.OnFailed += DoSomething;
}
private void DoSomething(Exception…</div>
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<time class="s-user-card--time" datetime="asked Aug 30 '21 at 05:05">asked Aug 30 '21 at 05:05</time>
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<h3><a href="../../questions/62282888/how-to-make-evenhandler-work-properly-in-javafx" class="question-hyperlink">How to make EvenHandler work properly in JavaFX?</a></h3>
<div class="excerpt">I re-arranged my question so it would be easier.
This code should generate Window and I need console output on press of keyboard.
Window appears but my EventHandlers doesn't works.
import javax.swing.*;
import java.awt.*;
import…</div>
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<time class="s-user-card--time" datetime="asked Jun 09 '20 at 12:42">asked Jun 09 '20 at 12:42</time>
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