javascript addEventListener 在 IE 中不起作用（在 IE8 中测试）
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addEventListener doesn't work in IE (tested in IE8)
提问by 1110
Work in Chrome and Firefox but not in IE. Fiddle
I have tried solution from herebut doesn't help.
可以在 Chrome 和 Firefox 中使用，但不能在 IE 中使用。小提琴
我已经尝试过这里的解决方案，但没有帮助。
if(window.attachEvent){
// Attach event code here
window.attachEvent("load", toolify);
}
else{
// Addeventlistener code here
window.addEventListener('load',toolify,false);
}
Error from IE:
来自 IE 的错误：
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)
Timestamp: Sat, 23 Nov 2013 08:10:42 UTC
Message: Object doesn't support this property or method
Code:
代码：
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Your Website</title>
<script>
"use strict";
function click(event) {
var elem = this.parentNode.querySelector('div.info_container');
if (elem) elem.style.display = elem.style.display === 'block' ? 'none' : 'block';
}
function toolify() {
var idx,
len,
elem,
info,
text,
elements = document.querySelectorAll('div.tooltip'),
canvas,
imgurl,
pointer,
tipHeight = 20,
tipWidth = 20,
width = 200,
height = 100,
ctx;
// Create a canvas element where the triangle will be drawn
canvas = document.createElement('canvas');
canvas.width = tipHeight;
canvas.height = tipWidth;
ctx = canvas.getContext('2d');
ctx.strokeStyle = '#000'; // Border color
ctx.fillStyle = '#fff'; // background color
ctx.lineWidth = 1;
ctx.translate(-0.5,-0.5); // Move half pixel to make sharp lines
ctx.beginPath();
ctx.moveTo(1,canvas.height); // lower left corner
ctx.lineTo(canvas.width, 1); // upper right corner
ctx.lineTo(canvas.width,canvas.height); // lower right corner
ctx.fill(); // fill the background
ctx.stroke(); // stroke it with border
//fix bottom row
ctx.fillRect(0,canvas.height-0.5,canvas.width-1,canvas.height+2);
// Create a div element where the triangel will be set as background
pointer = document.createElement('div');
pointer.style.width = canvas.width + 'px';
pointer.style.height = canvas.height + 'px';
pointer.innerHTML = ' ' // non breaking space
pointer.style.backgroundImage = 'url(' + canvas.toDataURL() + ')';
pointer.style.position = 'absolute';
pointer.style.top = '2px';
pointer.style.right = '1px';
pointer.style.zIndex = '1'; // place it over the other elements
for (idx=0, len=elements.length; idx < len; ++idx) {
elem = elements[idx];
elem.querySelector('img').addEventListener('click',click);
text = elem.querySelector('div.info');
// Create a new div element, and place the text and pointer in it
info = document.createElement('div');
text.parentNode.replaceChild(info,text);
info.className = 'info_container';
info.appendChild(pointer.cloneNode());
info.appendChild(text);
//info.addEventListener('click',click);
}
}
window.addEventListener('load',toolify);
</script>
<style>
div.tooltip
{
position:relative;
display:inline-block;
width:300px;
text-align:right;
}
div.tooltip > div.info
{
display:none;
}
div.tooltip div.info_container
{
position:absolute;
right:20px;
width:200px;
height:100px;
display:none;
}
div.tooltip div.info
{
text-align:left;
position:absolute;
left:1px;
right:1px;
top:20px;
bottom:1px;
color:#000;
padding:5px;
overflow:auto;
border:1px solid #000;
}
</style>
</head>
<body>
<div class='tooltip'>
<img src='http://www.craiglotter.co.za/wp-content/uploads/2009/12/craig_question_mark_icon1.png' alt='Help'/>
<div class='info'>
Some text to fill the box with.
</div>
</div>
<div class='tooltip'>
<img src='http://www.craiglotter.co.za/wp-content/uploads/2009/12/craig_question_mark_icon1.png' alt='Help'/>
<div class='info'>
Some text to fill the box with.
</div>
</div>
</body>
<html>
回答by RobG
In IE, the event name is "onload", in W3C compliant browsers it's "load", so:
在 IE 中，事件名称是“onload”，在符合 W3C 的浏览器中它是“load”，所以：
if (window.addEventListener) {
window.addEventListener('load', ...);
} else if (window.attachEvent) {
window.attachEvent('onload', ...);
}
A better function for adding listeners in IE8 is below. It sets thisto the element and passes eventas the first parameter when using attachEventto be more like addEventListener. It's not a full replacement for addEventListener, but there's an attempt at one on MDN. I'm not endorsing the function there (I think it will fail miserably in IE 7 and lower), just pointing it out as there is some good information in the article.
下面是在 IE8 中添加侦听器的更好功能。它设置这对元件并将事件使用时作为第一个参数的attachEvent更像的addEventListener。它不是addEventListener的完全替代品，但在MDN上有一个尝试。我不赞成那里的功能（我认为它会在 IE 7 及更低版本中惨遭失败），只是指出它，因为文章中有一些很好的信息。
function addListener(element, event, fn) {
// Use addEventListener if available
if (element.addEventListener) {
element.addEventListener(event, fn, false);
// Otherwise use attachEvent, set this and event
} else if (element.attachEvent) {
element.attachEvent('on' + event, (function (el) {
return function() {
fn.call(el, window.event);
};
}(element)));
// Break closure and primary circular reference to element
element = null;
}
}
回答by David
It's always a good idea to do a little research first. W3Schools (http://www.w3schools.com/jsref/dom_obj_event.asp) clearly gives the answer:
首先做一些研究总是一个好主意。W3Schools ( http://www.w3schools.com/jsref/dom_obj_event.asp) 清楚地给出了答案：
Allows the registration of event listeners on the event target (IE8 = attachEvent())
允许在事件目标上注册事件侦听器 (IE8 = attachEvent())
For knowing which one to use, just use a simple if statement
要知道使用哪个，只需使用一个简单的 if 语句
if(obj.attachEvent){
// Attach event code here
}
else{
// Addeventlistener code here
}
