event-bubbling

Event bubbling and the onblur event

由 夙愿已清 提交于 2019-12-03 21:23:41
问题 I'm writing a form validation script and would like to validate a given field when its onblur event fires. I would also like to use event bubbling so i don't have to attach an onblur event to each individual form field. Unfortunately, the onblur event doesn't bubble. Just wondering if anyone knows of an elegant solution that can produce the same effect. 回答1: ppk has a technique for this, including the necessary workarounds for IE: http://www.quirksmode.org/blog/archives/2008/04/delegating_the

Event Capturing, Event Bubbling and jQuery.on()

由 那年仲夏 提交于 2019-12-03 17:13:16
问题 I have an interesting question about event capturing , bubbling and jQuery.on() . I have recently learned more about the difference between event capturing and event bubbling and how the two flow differently in and out of the child-parent elements within the DOM. So to add an event listener with "event capture direction" i would use: element.addEventListener("click", myFunction, true); and to add an event listener with "event bubble direction" i would use: element.addEventListener("click",

What is the bubbling concept?

由 天涯浪子 提交于 2019-12-03 12:40:44
问题 I've heard of events and SO answers "bubbling up", but what has all that got to do with bubbles? 回答1: Event bubbling is the idea of information moving up through a deep structure, when proper design dictates that normally information should only flow downward. In very basic terms, think of a single object. Properly designed, this object should only know about its own child objects. It should have no direct interaction with its parent. Its children and parent objects, in turn, should follow

Does stopPropgation stop the event from propagating in the capture phase?

由 ≡放荡痞女 提交于 2019-12-03 10:33:54
I was looking at http://www.quirksmode.org/js/events_order.html and it is ambiguous in this part: In the Microsoft model you must set the event’s cancelBubble property to true . window.event.cancelBubble = true In the W3C model you must call the event’s stopPropagation() method. e.stopPropagation() This stops all propagation of the event in the bubbling phase. So my question is: When an event listener is set to listen in the capture phase, does it automatically not continue propagating to the inner elements? Or if it does continue propagating, does calling e.stopPropagation() stop it, or does

Event Capturing, Event Bubbling and jQuery.on()

由 倖福魔咒の 提交于 2019-12-03 05:28:49
I have an interesting question about event capturing , bubbling and jQuery.on() . I have recently learned more about the difference between event capturing and event bubbling and how the two flow differently in and out of the child-parent elements within the DOM. So to add an event listener with "event capture direction" i would use: element.addEventListener("click", myFunction, true); and to add an event listener with "event bubble direction" i would use: element.addEventListener("click", myFunction, false); This is all good and well, but what I want to know is when using jquery.on() to add

What is the preferred way to bubble events?

由 元气小坏坏 提交于 2019-12-03 05:15:01
I have three objects ObjectA has an ObjectB, ObjectB has an ObjectC. When ObjectC fires an event I need ObjectA to know about it, so this is what I've done... public delegate void EventFiredEventHandler(); public class ObjectA { ObjectB objB; public ObjectA() { objB = new ObjectB(); objB.EventFired += new EventFiredEventHandler(objB_EventFired); } private void objB_EventFired() { //Handle the event. } } public class ObjectB { ObjectC objC; public ObjectB() { objC = new ObjectC(); objC.EventFired += new EventFiredEventHandler(objC_EventFired); objC.FireEvent(); } public event

What is the bubbling concept?

由 谁都会走 提交于 2019-12-03 03:04:49
I've heard of events and SO answers "bubbling up", but what has all that got to do with bubbles? Event bubbling is the idea of information moving up through a deep structure, when proper design dictates that normally information should only flow downward. In very basic terms, think of a single object. Properly designed, this object should only know about its own child objects. It should have no direct interaction with its parent. Its children and parent objects, in turn, should follow the same rules. In effect, this means that information can only flow downward - a parent can invoke a method,

d3 Click to create circle and click to remove

由 自闭症网瘾萝莉.ら 提交于 2019-12-02 05:39:43
问题 I am trying to click on a circle to remove it, but clicking on the canvas will create a circle. I do want to actually remove the circle and it's object from the data, as opposed to just making it transparent. On click on a circle calls the function function removeElement(d) { d3.select(this) .remove(); } This function is called with a basic click on the circle, .on("click", removeElement); I think I'm not correctly distinguishing between clicking on the canvas to create a circle where none

Preventing WPF TreeView's SelectedItemChanged event from bubbling

由 青春壹個敷衍的年華 提交于 2019-12-02 01:25:32
问题 I have a WPF TreeView which triggers a SelectedItemChanged event. Whenever I select an item in the TreeView , the SelectedItemChanged event is triggered for the selected item and all of the selected node's ancestors in the tree . How do I prevent the SelectedItemChanged event from firing more than once? 回答1: Set the e.Handled to true in the handler. EDIT As an update to this subject, view this blog post. 来源： https://stackoverflow.com/questions/1127614/preventing-wpf-treeviews

d3 Click to create circle and click to remove

由 那年仲夏 提交于 2019-12-02 00:39:40
I am trying to click on a circle to remove it, but clicking on the canvas will create a circle. I do want to actually remove the circle and it's object from the data, as opposed to just making it transparent. On click on a circle calls the function function removeElement(d) { d3.select(this) .remove(); } This function is called with a basic click on the circle, .on("click", removeElement); I think I'm not correctly distinguishing between clicking on the canvas to create a circle where none exists and clicking on an existing circle to remove it. <!DOCTYPE html> <meta charset="utf-8"> <style>
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