每次按提交时,我都创建了一个简单的页面来更改div id。我的问题是这改变了div_top1 - > div_top2,但第二次按下按钮时,它停止改变:(
<!DOCTYPE html>
<html>
<head>
<script>
function changediv()
{
document.getElementById("div_top1").innerHTML=Date();
document.getElementById("div_top1").setAttribute("id", "div_top2");
document.getElementById("div_top2").innerHTML="teste";
document.getElementById("div_top2").setAttribute("id", "div_top1");
}
</script>
<style>
.top {
background-color: navy;
color: white;
padding: 10px 10px 10px 10px;
margin: 5px 5px 5px 5px;
}
.down {
background-color: aqua;
padding: 10px 10px 10px 10px;
margin: 5px 5px 5px 5px;
}
</style>
</head>
<body>
<div id="div_top1" class="top">This is a paragraph.</div>
<div class="down"><button type="button" onclick="changediv()">Display Date</button></div>
</body>
</html>
答案 0 :(得分:15)
试试这个:
function changediv()
{
if (document.getElementById("div_top1")) {
document.getElementById("div_top1").innerHTML=Date();
document.getElementById("div_top1").setAttribute("id", "div_top2");
}
else {
document.getElementById("div_top2").innerHTML="teste";
document.getElementById("div_top2").setAttribute("id", "div_top1");
}
}
答案 1 :(得分:3)
问题不在于改变身份 - 而是你每次都以两种方式改变它。你需要一个if条件。您还应该使用.id来更改id而不是setAttribute() - 我在过去(很多年前)使用setAttribute进行id更改时遇到了一些浏览器的问题。
DEMO:http://jsfiddle.net/x2nPY/
function changediv() {
if (document.getElementById("div_top1")) {
document.getElementById("div_top1").innerHTML = Date();
document.getElementById("div_top1").id = "div_top2";
} else {
document.getElementById("div_top2").innerHTML = "teste";
document.getElementById("div_top2").id = "div_top1";
}
}
答案 2 :(得分:1)
您可以使用if,例如,如果您想要切换它或在每次提交时更改,如:
function changediv() {
if (document.getElementById("div_top1"))
{
document.getElementById("div_top1").innerHTML=Date();
document.getElementById("div_top1").setAttribute("id", "div_top2");
}
else
{
document.getElementById("div_top2").innerHTML="teste";
document.getElementById("div_top2").setAttribute("id", "div_top1");
}
}
请参阅Fiddle Demo