1. document.getElementById("removeButton").disabled = false;//普通Js寫法
2. $("#removeButton").removeAttr("disabled");//要變成Enable,JQuery只能這麼寫
3. $("#removeButton").attr("disabled","disabled");//再改成disabled
在JSP頁面中,當表單必填字段有值時,才能點擊【提交】按鈕,如必填字段爲空則【提交】按鈕不能點擊。實現如下:
JS部分:
<script type="text/javascript">
$().ready(function() {
$("#name").blur(
function(){
if($.trim($(this).val()) != ''){
$("#butn1").removeAttr("disabled");
}else{
$("#butn1").attr("disabled","disabled");
}
}
);
$("#name").focus(
function(){
if($.trim($(this).val()) == ''){
$("#butn1").attr("disabled","disabled");
}
}
);
});
</script>
HTML部分:
<body>
姓名:
<input id="name" type="text" name="name"/>
<p></p>
<input id="butn1" type="button" name="buttons1" value="提交1" disabled="disabled" />
<P></P>
<span id="errMsgSpan"></span>
</body>