标签：for events yellow elements detail 内容 eof getchar txt
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<title>Document</title>
</head>
<body>
<p id=‘p‘>test<p>
<form>
<input type=‘submit‘ value=‘Submit Form‘ >
</form>
<form>
<button type=‘submit‘ name="submit-btn" autofocus>Submit Form</button>
</form>
<form name=‘form2‘>
<input type=‘image‘ src=‘2.jpg‘ width=‘15%‘height=‘15%‘>
</form>
<form>
<input type=‘reset‘ value=‘Rest From‘>
<button type=‘reset‘>Rest From</button>
</form>
<form>
<select>
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
</form>
<form>
<!--
行间添加JavaScript代码，解决IE下mouseout不能取消焦点问题
标准下获得焦点可以select()取消焦点blur()
非标准下获得焦点select()取消焦点 this.value = this.value
-->
<input id="txtId" type="text" value="over out" onmouseover="javascript:this.select();" onmouseout="javascript:this.blur()||(this.value=this.value);"/>
</form>
<form>
<textarea rows=‘15‘ cols=‘15‘ style=‘resize:none‘>121545sd2154521212312313213</textarea>
</form>
<script type="text/javascript">
var EventUtil = {
addHandler: function(element,type,handler){//添加事件
if (element.addEventListener)
{
element.addEventListener(type,handler,false);
}else if (element.attachEvent)
{
element.attachEvent(‘on‘+type,function(){
//做的IE兼容
handler.call(element);
});
}else {
element[‘on‘+type] = handler;
}
},
getEvent: function(event){//获得事件对象
return event || window.event;
},
getTarget: function(event){//获得事件元素
return event.target || event.srcElement;
},
preventDefault: function(){//取消默认事件行为
if (event.preventDefault)
{
event.preventDefault();
}else {
event.returnValue = false;
}
},
removeHandler: function(element,type,handler){//取消事件
if (element.removeEventListener)
{
element.removeEventListener(type,handler,false)
}else if (element.dettchEvent)
{
element.dettchEvent(‘on‘+type,handler);
}else {
element[‘on‘+type] = null;
}
},
stopPropagation: function(event){//取消冒泡机制
if (event.stopPropagation)
{
event.stopPropagation();
}else {
event.cancleBubble = true;
}
},
getRelatedTarget: function(event){
if (event.relatedTarget)
{
return event.relatedTarget;//标准下返回相关元素
}else if (event.toElement)
{
return event.toElement;//mouseout事件触发，保存相关元素
}else if (event.fromElement)
{
return event.fromElement;//mouseover事件触发，保存相关元素
}
},
getButton: function(event){//鼠标按钮兼容
if (document.implementation.hasFeature(‘MouseEvents‘,‘2.0‘))//标准下
{
return event.button;
}else {
switch (event.button)//非标准下
{
case 0:
case 1:
case 3:
case 5:
case 7:
return 0;
case 2:
case 6:
return 2;
case 4:
return 1;
}
}
},
getWheelDelta: function(event){//滚轮事件兼容
//所以要兼容，写两个函数函数
//client的兼容性必须先写出来
if (event.wheelDelta)
{
/*
兼容opear9.5以前版本的正负相反，mousewheel
*/
return (window.client.engine.opera && window.client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);
}else {
/*
兼容firefox正负和3的倍数的问题，DOMMouseScroll
*/
return -event.detail*40;
}
},
getCharCode: function(event){//键盘事件兼容
if (typeof event.charCode == ‘number‘)//首先检测按键有没有代表的字符，如果没有就没有charCode，为undefined
{
return event.charCode;
}else {
return event.keyCode
}
}
};
var af = document.forms;
/*
function sub(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
//target.elements获得是一个集合可以用下表取得也可以用名字获得
var btn = target.elements[‘submit-btn‘];
document.body.innerHTML += btn ;
//禁用提交
btn.disable = true;
}
EventUtil.addHandler(af[1],‘submit‘,sub)
//刷新网页设置聚焦的元素
//如果input元素type属性为hidden或css的display和visibility属性隐藏了该字段，同样也会导致错误
EventUtil.addHandler(window,‘load‘,function(event){
document.forms[1].elements[‘submit-btn‘].focus();
});
//元素可以添加autofocus来自动聚焦，如果添加了ele.autofocus === true
//检测是否设置了autofocus,autofocus是布尔值
EventUtil.addHandler(window,‘load‘,function(event){
var element = document.forms[1].elements[‘submit-btn‘];
if (element.autofocus !== true)
{
element.focus();
console.log( ‘JS focus‘ );
}
});
//获得焦点，然后文本框变色，或者触发change事件，检测输入的内容是否合法
var textBox = document.forms[document.forms.length-1].elements[0];
console.log( textBox );
EventUtil.addHandler(textBox,‘focus‘,change1);
EventUtil.addHandler(textBox,‘blur‘,change2);
EventUtil.addHandler(textBox,‘change‘,change3);
function change1(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
if (target.style.background === ‘‘)
{
target.style.background = ‘yellow‘;
}
}
function change2(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
if (/[^\d]/.test(target.value))
{
target.style.background = ‘red‘;
}else {
target.style.background = ‘‘;
}
}
function change3(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
console.log(1)
if (/[^\d]/.test(target.value))
{
target.style.background = ‘red‘;
}else {
target.style.background = ‘‘;
}
}
*/
/*
//非标准下聚焦的触发事件
var textBox = af[af.length-1].elements[0];
EventUtil.addHandler(textBox,‘focus‘,change);
function change(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
target.select();
}
*/
//这里不能使用select触发，虽然标准下可以正常，但是IE兼容的不行他会在刚一触发就执行
//所以只能用mouseup触发
var textBox = af[af.length-1].elements[0];
EventUtil.addHandler(textBox,‘mouseup‘,fn);
function fn(event){
var that = this;
//ie兼容
var a = compa(that);
alert(a);
}
//兼容函数
function compa(that){
if (typeof that.selectionStart === ‘number‘)
{
return that.value.substring(that.selectionStart,that.selectionEnd);
}else {
//document.selection.createRange()为一个对象
return document.selection.createRange().text;
}
}
alert(blur in window)
</script>
</body>
</html>
标签：for events yellow elements detail 内容 eof getchar txt
原文地址：https://www.cnblogs.com/jokes/p/9862718.html
