event-handling – Page 12

JavaScript: Listen for attribute change?

January 4, 2023 by Tarik

You need MutationObserver, Here in snippet I have used setTimeout to simulate modifying attribute var element = document.querySelector(‘#test’); setTimeout(function() { element.setAttribute(‘data-text’, ‘whatever’); }, 5000) var observer = new MutationObserver(function(mutations) { mutations.forEach(function(mutation) { if (mutation.type === “attributes”) { console.log(“attributes changed”) } }); }); observer.observe(element, { attributes: true //configure it to listen to attribute changes }); <div … Read more

Changing UIButton text

January 3, 2023 by Tarik

When laying out its subviews, a UIButton will set its titleLabel’s text value using its own title values, so that you can set up to four different strings for the four states (normal, highlighted, selected, disabled). Because of this feature, setting the titleLabel’s text directly won’t persist, and will be reset by the button when … Read more

Order of event handler execution

December 31, 2022 by Tarik

Currently, they are executed in the order they are registered. However, this is an implementation detail, and I would not rely on this behavior staying the same in future versions, since it is not required by specifications.

C# pattern to prevent an event handler hooked twice [duplicate]

December 28, 2022 by Tarik

How about just removing the event first with -= , if it is not found an exception is not thrown /// -= Removes the event if it has been already added, this prevents multiple firing of the event ((System.Windows.Forms.WebBrowser)sender).Document.Click -= new System.Windows.Forms.HtmlElementEventHandler(testii); ((System.Windows.Forms.WebBrowser)sender).Document.Click += new System.Windows.Forms.HtmlElementEventHandler(testii);

When should I use jQuery’s document.ready function?

December 27, 2022 by Tarik

In simple words, $(document).ready is an event which fires up when document is ready. Suppose you have placed your jQuery code in head section and trying to access a dom element (an anchor, an img etc), you will not be able to access it because html is interpreted from top to bottom and your html … Read more

Get clicked element using jQuery on event?

December 26, 2022 by Tarik

As simple as it can be Use $(this) here too $(document).on(“click”,”.appDetails”, function () { var clickedBtnID = $(this).attr(‘id’); // or var clickedBtnID = this.id alert(‘you clicked on button #’ + clickedBtnID); });

How to remove “onclick” with JQuery?

December 25, 2022 by Tarik

Old Way (pre-1.7): $(“…”).attr(“onclick”, “”).unbind(“click”); New Way (1.7+): $(“…”).prop(“onclick”, null).off(“click”); (Replace … with the selector you need.) // use the “[attr=value]” syntax to avoid syntax errors with special characters (like “$”) $(‘[id=”a$id”]’).prop(‘onclick’,null).off(‘click’); <script src=”https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js”></script> <a id=”a$id” onclick=”alert(‘get rid of this’)” href=”https://stackoverflow.com/questions/1687790/javascript:void(0)” class=”black”>Qualify</a>

jQuery: $().click(fn) vs. $().bind(‘click’,fn);

December 24, 2022 by Tarik

For what it’s worth, from the jQuery source: jQuery.each( (“blur,focus,load,resize,scroll,unload,click,dblclick,” + “mousedown,mouseup,mousemove,mouseover,mouseout,mouseenter,mouseleave,” + “change,select,submit,keydown,keypress,keyup,error”).split(“,”), function(i, name){ // Handle event binding jQuery.fn[name] = function(fn){ return fn ? this.bind(name, fn) : this.trigger(name); }; }); So no, there’s no difference – $().click(fn) calls $().bind(‘click’,fn)

How to trigger event when a variable’s value is changed?

December 22, 2022 by Tarik

Seems to me like you want to create a property. public int MyProperty { get { return _myProperty; } set { _myProperty = value; if (_myProperty == 1) { // DO SOMETHING HERE } } } private int _myProperty; This allows you to run some code any time the property value changes. You could raise … Read more

Javascript event handler with parameters

December 20, 2022 by Tarik

I don’t understand exactly what your code is trying to do, but you can make variables available in any event handler using the advantages of function closures: function addClickHandler(elem, arg1, arg2) { elem.addEventListener(‘click’, function(e) { // in the event handler function here, you can directly refer // to arg1 and arg2 from the parent function … Read more