Events - General
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Concept: some components are executed some operations, trigger the execution of some code.
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Event: some actions. For example: click, double-click, keyboard pressed, mouse moved
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Event source: component. Such as: button, text input box, etc
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Listener: code.
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Register listening: combine event, event source and listener together. When an event occurs on the event source, the execution of a listener code is triggered.
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Common events:
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Click event:
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onclick: click event
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ondblclick: double click event
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Focus events
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onblur: losing focus
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onfocus: element gets focus.
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Load event:
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onload: a page or an image is loaded.
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Mouse events:
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onmousedown mouse button is pressed.
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onmouseup the mouse button is released.
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onmousemove mouse is moved.
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onmouseover mouse over an element.
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onmouseout mouse moves away from an element.
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Keyboard events:
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Onkeydowna keyboard key is pressed.
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Onkeyupa keyboard key is released.
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onkeypress a keyboard key is pressed and released.
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Selection and change
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The content of onchang E domain has been changed.
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The onselect text is selected.
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Form event:
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The onsubmit confirmation button is clicked.
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The onreset button is clicked.
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Case 5 - select all forms
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Form selection</title>
<style>
table{
border: 1px solid;
width: 500px;
margin-left: 30%;
}
td,th{
text-align: center;
border: 1px solid;
}
div{
margin-top: 10px;
margin-left: 30%;
}
.out{
background-color: white;
}
.over{
background-color: pink;
}
</style>
</head>
<body>
<table>
<caption>Student information form</caption>
<tr>
<th><input type="checkbox" name="cb" id="fist_cb"></th>
<th>number</th>
<th>Full name</th>
<th>Gender</th>
<th>operation</th>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>1</td>
<td>Linghu Chong</td>
<td>male</td>
<td><a href="javascript:void(0);">delete</a></td>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>2</td>
<td>Ren Woxing</td>
<td>male</td>
<td><a href="javascript:void(0);">delete</a></td>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>3</td>
<td>Yue buqun</td>
<td>?</td>
<td><a href="javascript:void(0);">delete</a></td>
</tr>
</table>
<div>
<input type="button" id="selectAll" value="All election">
<input type="button" id="unSelectAll" value="Totally unselected">
<input type="button" id="selectRev" value="Reverse election">
</div>
<script>
//All election
document.getElementById("selectAll").onclick = function () {
//Get all
var cbs = document.getElementsByName("cb");
for (var i = 0; i < cbs.length; i++) {
//Set each property to checked
cbs[i].checked = true;
}
}
//Totally unselected
document.getElementById("unSelectAll").onclick = function () {
//Get all
var cbs = document.getElementsByName("cb");
for (var i = 0; i < cbs.length; i++) {
//Set each property to checked
cbs[i].checked = false;
}
}
//Reverse election
document.getElementById("selectRev").onclick = function () {
//Get all
var cbs = document.getElementsByName("cb");
for (var i = 0; i < cbs.length; i++) {
//Set each property to checked
cbs[i].checked = !cbs[i].checked;
}
}
//Set other buttons to the same state as the first button
document.getElementById("fist_cb").onclick = function () {
//Get all
var cbs = document.getElementsByName("cb");
for (var i = 0; i < cbs.length; i++) {
//Set each property to checked this as the first
cbs[i].checked = this.checked;
}
}
//Set the background color to change when the mouse moves up
var trs = document.getElementsByTagName("tr");
//ergodic
for (var i = 0; i < trs.length; i++) {
//Move to element
trs[i].onmouseover = function () {
this.className = "over";
}
//Removed elements
trs[i].onmouseout = function () {
this.className = "out";
}
}
</script>
</body>
</html>
Case 6 - form inspection
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Registration page</title>
<style>
*{
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
body{
background: url("img/register_bg.png") no-repeat center;
padding-top: 25px;
}
.rg_layout{
width: 900px;
height: 500px;
border: 8px solid #EEEEEE;
background-color: white;
/*Center the div horizontally*/
margin: auto;
}
.rg_left{
/*border: 1px solid red;*/
float: left;
margin: 15px;
}
.rg_left > p:first-child{
color:#FFD026;
font-size: 20px;
}
.rg_left > p:last-child{
color:#A6A6A6;
font-size: 20px;
}
.rg_center{
float: left;
/* border: 1px solid red;*/
}
.rg_right{
/*border: 1px solid red;*/
float: right;
margin: 15px;
}
.rg_right > p:first-child{
font-size: 15px;
}
.rg_right p a {
color:pink;
}
.td_left{
width: 100px;
text-align: right;
height: 45px;
}
.td_right{
padding-left: 50px ;
}
#username,#password,#email,#name,#tel,#birthday,#checkcode{
width: 251px;
height: 32px;
border: 1px solid #A6A6A6 ;
/*Set border fillet*/
border-radius: 5px;
padding-left: 10px;
}
#checkcode{
width: 110px;
}
#img_check{
height: 32px;
vertical-align: middle;
}
#btn_sub{
width: 150px;
height: 40px;
background-color: #FFD026;
border: 1px solid #FFD026 ;
}
#td_sub{
padding-left: 150px;
}
.error{
color:red;
vertical-align: middle;
}
</style>
<script>
window.onload = function () {
document.getElementById("form").onsubmit = function () {
//Verify user name
//Verify password
//Returns true if all are successful
return checkUsername() && checkPassword();
}
document.getElementById("username").onblur = checkUsername;
document.getElementById("password").onblur = checkPassword;
}
function checkUsername() {
//Get the contents of the input box
var username = document.getElementById("username").value;
//Define regular
var reg_username = /^\w{6,12}$/;
//Check whether it is regular
var flag = reg_username.test(username);
if(flag){
s_username.innerHTML = "<img height='25' width='35' src='img/gou.png'>"
}else{
s_username.innerHTML = "Incorrect format of user name";
}
return flag;
}
function checkPassword() {
//Get the contents of the input box
var username = document.getElementById("password").value;
//Define regular
var reg_username = /^\w{6,12}$/;
//Check whether it is regular
var flag = reg_username.test(username);
if(flag){
s_password.innerHTML = "<img height='25' width='35' src='img/gou.png'>"
}else{
s_password.innerHTML = "Incorrect password format";
}
return flag;
}
</script>
</head>
<body>
<div class="rg_layout">
<div class="rg_left">
<p>New user registration</p>
<p>USER REGISTER</p>
</div>
<div class="rg_center">
<div class="rg_form">
<!--Define form form-->
<form action="#" id="form" method="get">
<table>
<tr>
<td class="td_left"><label for="username">User name</label></td>
<td class="td_right">
<input type="text" name="username" id="username" placeholder="enter one user name">
<span id="s_username" class="error"></span>
</td>
</tr>
<tr>
<td class="td_left"><label for="password">Password</label></td>
<td class="td_right">
<input type="password" name="password" id="password" placeholder="Please input a password">
<span id="s_password" class="error"></span>
</td>
</tr>
<tr>
<td class="td_left"><label for="email">Email</label></td>
<td class="td_right"><input type="email" name="email" id="email" placeholder="Please enter email"></td>
</tr>
<tr>
<td class="td_left"><label for="name">Full name</label></td>
<td class="td_right"><input type="text" name="name" id="name" placeholder="Please enter a name"></td>
</tr>
<tr>
<td class="td_left"><label for="tel">Cell-phone number</label></td>
<td class="td_right"><input type="text" name="tel" id="tel" placeholder="Please enter your mobile number"></td>
</tr>
<tr>
<td class="td_left"><label>Gender</label></td>
<td class="td_right">
<input type="radio" name="gender" value="male"> male
<input type="radio" name="gender" value="female"> female
</td>
</tr>
<tr>
<td class="td_left"><label for="birthday">Date of birth</label></td>
<td class="td_right"><input type="date" name="birthday" id="birthday" placeholder="Please enter the date of birth"></td>
</tr>
<tr>
<td class="td_left"><label for="checkcode" >Verification Code</label></td>
<td class="td_right"><input type="text" name="checkcode" id="checkcode" placeholder="Please enter the verification code">
<img id="img_check" src="img/verify_code.jpg">
</td>
</tr>
<tr>
<td colspan="2" id="td_sub"><input type="submit" id="btn_sub" value="register"></td>
</tr>
</table>
</form>
</div>
</div>
<div class="rg_right">
<p>Existing accounts?<a href="#"> log in now</a></p>
</div>
</div>
</body>
</html>
