在元素上添加事件侦听器 - Javascript [英] Adding Event Listeners on Elements - Javascript
问题描述
有没有办法让我从onload函数在javascript中收听onblur或onclick事件？而不是在元素本身中执行。
Are there ways for me to listen for onblur or onclick events in javascript from an onload function? instead of doing it in the element itself.
<input type="button" id="buttonid" value="click" onclick="func()">
成为
function onload() {
var button = document.getElementById("buttonid");
button.addEventListener("onclick", function() { alert("alert");});
}
编辑
<html>
<head>
<script>
function onload() {
var button = document.getElementById("buttonid");
if(button.addEventListener){
button.addEventListener("click", function() { alert("alert");});
} else {
button.attachEvent("click", function() { alert("alert");});
};
};
window.onload = onload;
</script>
</head>
<body>
<input type="button" id="buttonid" value="click">
</body>
</html>
更新
<script type="text/javascript">
function on_load() {
var button = document.getElementById("buttonid");
if(button.addEventListener){
button.addEventListener("click", function() { alert("alert");});
} else {
button.attachEvent("click", function() { alert("alert");});
};
};
window.onload = on_load();
</script>
推荐答案
您正在做的这样做很好，但您的事件监听器点击事件应该是这样的： / p>
The way you are doing it is fine, but your event listener for the click event should be like this:
button.addEventListener("click", function() { alert("alert");});
请注意，应附加点击事件使用点击，而不是onclick。
Notice, the click event should be attached with "click", not "onclick".
你也可以尝试这样做：
function onload() {
var button = document.getElementById("buttonid");
// add onclick event
button.onclick = function() {
alert("alert");
}
}
更新1
您还需要监视IE< 9，因为那些Vs使用 attachEvent（）。附加这样的事件，所以它可以与恐龙浏览器一起工作：
Update 1
You need to also monitor for IE < 9, because those Vs use attachEvent(). Attach the event like this, so it will work with dinosaur browsers:
if(button.addEventListener){
button.addEventListener('click', function() { alert("alert");});
} else if(button.attachEvent){ // IE < 9 :(
button.attachEvent('onclick', function() { alert("alert");});
}
更新2
根据您的编辑，此应该工作 工作很好。
<html>
<head>
<script type="text/javascript">
function init() {
var button = document.getElementById("buttonid");
if(button.addEventListener){
button.addEventListener("click", function() { alert("alert");}, false);
} else if(button.attachEvent){
button.attachEvent("onclick", function() { alert("alert");});
}
};
if(window.addEventListener){
window.addEventListener("load", init, false);
} else if(window.attachEvent){
window.attachEvent("onload", init);
} else{
document.addEventListener("load", init, false);
}
</script>
</head>
<body>
<input type="button" id="buttonid" value="click">
</body>
</html>
请不要使用 window.onload = on_load（）; ，这将阻止所有其他 onload 事件侦听器被触发，或者您有风险让您的事件侦听器被覆盖。考虑以上述方式附加 onload 事件。
Please, do not use window.onload = on_load();, this will prevent all other onload event listeners from getting fired, or you are risking for your event listener to get overwritten. Consider attaching the onload event the way I am suggesting above.
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