Skip to main content

HTML DOM bubbling and capturing With the addEventListener() in JAVA SCRIPT

Event Bubbling or Event Capturing..
There are two ways of event propagation in the HTML DOM, bubbling and capturing.
Event propagation is a way of defining the element order when an event occurs. If you have a
element inside a <div>
element, and the user clicks on the
element, which element's "click" event should be handled first?
In bubbling the inner most element's event is handled first and then the outer: the
element's click event is handled first, then the <div> element's click event.
In capturing the outer most element's event is handled first and then the inner: the <div> element's click event will be handled first, then the element's click event.
With the addEventListener() method you can specify the propagation type by using the "useCapture" parameter:
Syntax: addEventListener(event, function, useCapture);
CODING:
<!DOCTYPE html>
<html>
<head>
<style>
div {
    border: 5px solid lightgreen;
    text-align :center;
    padding: 2px;
}
</style>
</head>
<body>
<div id="myDiv">
  <h3 id="h3">Click this heading, I am Bubbling.</h3>
  <p id="myP">Click this paragraph, I am Bubbling.</p>
</div><br>

<div id="myDiv2">
  <h3 id="h32">Click this heading, I am Capturing</h3>
  <p id="myP2">Click this paragraph, I am Capturing.</p>
</div>

<script>
document.getElementById("myP").addEventListener("click", function() {
    alert(event.srcElement);}, false);
document.getElementById("h3").addEventListener("click", function() {
    alert(event.srcElement);}, false);
document.getElementById("myDiv").addEventListener("click", function() {
    alert("1st Div tag");}, false);

document.getElementById("myP2").addEventListener("click", function() {
    alert(event.srcElement);}, true);
document.getElementById("h32").addEventListener("click", function() {
    alert(event.srcElement);}, true);
document.getElementById("myDiv2").addEventListener("click", function() {
    alert("2nd Div tag");}, true);
</script>
</body>
</html>

Comments

Post a Comment

Popular posts from this blog

BCA SEM 5 SHELL SCRIPT PROGRAM

1  Write a shell script to execute following commands 1. Sort file abc.txt and save this sorted file in xyz.txt 2. Give an example of : To execute commands together without affecting result of each other. 3. How to print “this is a three –line 1. Text message” 4. Which command display version of the UNIX? 5. How would u get online help of cat command? echo “sorting the file” sort abc.txt > xyz.txt echo “executing two commands” who ; ls echo “this is \n a three-line \n Text message” # use -e option if required echo “The version is `uname -a`” echo “Help of cat command” man cat 2  Write a shell script to execute following commands 1. How would u display the hidden files? 2. How delete directory with files? 3. How would user can do interactive copying? 4. How would user can do interactive deletion of files? 5. Explain two functionality of “mv” command with example? echo “1. How would u display the hidden files” echo “2. How delete directory with files” echo...
Post a Comment
Read more

C++

I NTRODUCTION TO OOP,CLASSES & OBJECTS 1. Use of scope Resolution of Operators. 2. Define a function outside a using scope resolution operators. 3. Write a program to calculate the area of circle, rectangle and square using function overloading. 4. Write a program to calculate the area of circle, rectangle and square using with class & object. 5. Write a program to demonstrate the use of returning a reference variable. 6. Create a class student,stores the details about name,roll no,marks of 5 subject,1.get function accept value of data members,2. display function to display,3.total function to return total of 5 subjects marks. 7. Create function power() in c++. & Create function power() in c++ and default argument. 8. Write a C++ program to swap the value of private data members from 2 different classes. 9. Write a program to illustrate the use of this pointer. 10. An election is contested by five candidates. The candidates are numbered 1 to 5 and the voting is do...
Post a Comment
Read more

Advanced Controls in VB.NET

1. Create a windows application as a word finder, which finds & replace the occurrence of that word with another word in VB.NET. 2. Create an application in which a user can enter a numeric value using one scroll bar between 0 to 100 and displays conversion of the value into Fahrenheit in VB.NET. 3. There are 3 Track Bars on the Form. The first Track Bar is stands for Red, second for Green and third for Blue, depends on the position of indicator the background color of label is display on Mouse Move in VB.NET. 4. Write a program to create a Treeview dynamically with buttons Add To Root, Add To Selected Node, Remove and Scan buttons.On click of Scan button all the nodes of the Treeview should be listed in the Listbox placed in side by. 5. Write a Program to Implement a MDI application. It should have File menu with option New, Close, Close All and Exit. It should also have window menu to arrange the child forms like Tile Horizontal, Tile Vertical, Cascade and Arrange Icons in VB...
Post a Comment
Read more