Javascript 将事件附加到输入框和选择框
我似乎无法理解如何将事件(动态)附加到文本框和选择框: 错误:需要对象,第19行Javascript 将事件附加到输入框和选择框,javascript,html,dom,javascript-events,Javascript,Html,Dom,Javascript Events,我似乎无法理解如何将事件(动态)附加到文本框和选择框: 错误:需要对象,第19行 <!DOCTYPE html> <html> <head> <script type="text/javascript"> window.onload = function fnOnLoad() { var t = document.getElementsByTagName('SELEC
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
window.onload = function fnOnLoad() {
var t = document.getElementsByTagName('SELECT');
var i;
for (i = 0; i < t.length; i++) {
alert(t[i].id)
document.getElementById(t[i].id).attachEvent('onfocus', function () {
document.getElementById(this.id).style.backgroundColor = "#FFFF80"
})
document.getElementById(t[i].id).attachEvent('onblur', function () {
document.getElementById(this.id).style.backgroundColor = "#FFFFFF"
})
}
}
</script>
</head>
<body>
<input id="t1" type="text">
<input id="t2" type="text">
<input id="t3" type="text">
<br>
<br>
<select id="d1"></select>
<select id="d2"></select>
<select id="d3"></select>
</body>
</html>
window.onload=函数fnOnLoad(){
var t=document.getElementsByTagName('SELECT');
var i;
对于(i=0;i
为什么不使用jquery并使用bind函数:例如:
var element = $('#myElementId') // equivalent to document.getElementById
element.bind('click', function() {
// when the element is clicked, it will do what ever you write here
alert('i was clicked');
});
您可以使用jquery将此代码放入onload或onready函数中,如下所示:
$(function() {
var element = $('#myElementId') // equivalent to document.getElementById
element.bind('click', function() {
// when the element is clicked, it will do what ever you write here
alert('i was clicked');
});
}); // this is the onload
或
函数fnOnLoad(){
var t=document.getElementsByTagName('INPUT');
对于(变量i=0;i
您需要在DOM准备就绪时运行此操作,而不是在onload事件中运行此操作。看看这个:顺便说一句,您可以通过jquery选择器获取所有select元素来绑定它们,这样您就可以使用$('myElementId')
而不是$('select')
来获取文档中的所有select元素
$(document).ready(function() {
var element = $('#myElementId') // equivalent to document.getElementById
element.bind('click', function() {
// when the element is clicked, it will do what ever you write here
alert('i was clicked');
});
}); // this is the on ready
<script type="text/javascript">
function fnOnLoad() {
var t = document.getElementsByTagName('INPUT');
for (var i = 0; i < t.length; i++) {
t[i].onfocus = function() { this.style.backgroundColor = '#FFFFC4';};
t[i].onblur = function() { this.style.backgroundColor = '#FFFFFF'; };
}
var d = document.getElementsByTagName('SELECT');
for (var i = 0; i < d.length; i++) {
d[i].onfocus = function() { this.style.backgroundColor = '#FFFFC4'; };
d[i].onblur = function() { this.style.backgroundColor = '#FFFFFF'; };
}
}
</script>