This question already has answers here: Is right click a Javascript event? (20 answers) Closed 8 years ago. I want to block the standard context menus, and handle the right-click event manually. How is this done? 2 Answers 2
I have a hidden text field whose value gets updated via an AJAX response. <input type=”hidden” value=”” name=”userid” id=”useid” /> When this value changes, I would like to fire an AJAX request. Can anyone advise on how to detect the change? I have the following code, but do not know how to look for the … Read more
I don’t understand the difference, they both seem the same but I guess they are not. Any examples of when to use one or the other would be appreciated. 10 Answers 10
I understand the purpose of events, especially within the context of creating user interfaces. I think this is the prototype for creating an event: public void EventName(object sender, EventArgs e); What do event handlers do, why are they needed, and how do I to create one? 13 Answers 13
a can only be final here. Why? How can I reassign a in onClick() method without keeping it as private member? private void f(Button b, final int a){ b.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { int b = a*5; } }); } How can I return the 5 * a when it clicked? … Read more
This question already has answers here: How to trigger event in JavaScript? (19 answers) Closed 7 years ago. I’m setting a date-time textfield value via a calendar widget. Obviously, the calendar widget does something like this : document.getElementById(‘datetimetext’).value = date_value; What I want is: On changing value in the date-time textfield I need to reset … Read more
How can I detect any text changes in a textField? The delegate method shouldChangeCharactersInRange works for something, but it did not fulfill my need exactly. Since until it returns YES, the textField texts are not available to other observer methods. e.g. in my code calculateAndUpdateTextFields did not get the updated text, the user has typed. … Read more
I need to debug a web application that uses jQuery to do some fairly complex and messy DOM manipulation. At one point, some of the events that were bound to particular elements, are not fired and simply stop working. If I had a capability to edit the application source, I would drill down and add … Read more
$(document).ready(function() { //set initial state. $(‘#textbox1’).val($(this).is(‘:checked’)); $(‘#checkbox1’).change(function() { $(‘#textbox1’).val($(this).is(‘:checked’)); }); $(‘#checkbox1’).click(function() { if (!$(this).is(‘:checked’)) { return confirm(“Are you sure?”); } }); }); <script src=”https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js”></script> <input type=”checkbox” id=”checkbox1″/><br /> <input type=”text” id=”textbox1″/> Here .change() updates the textbox value with the checkbox status. I use .click() to confirm the action on uncheck. If the user selects cancel, … Read more
Which is more widely supported: window.onload or document.onload? 10 s 10 When do they fire? window.onload By default, it is fired when the entire page loads, including its content (images, CSS, scripts, etc.). In some browsers it now takes over the role of document.onload and fires when the DOM is ready as well. document.onload It … Read more
