HTML与JavaScript自动聚焦及选中示例-优快云博客

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript">
window.onload = function(){
var oForm = document.forms[0];
oForm.elements[0].focus();
//alert(oForm.elements[0].value);
var txt1 = document.getElementById("txt1");
//alert(txt1.value.length);
txt1.focus();
txt1.select();
var colInputs = document.getElementsByTagName('input');
var colTextarea = document.getElementsByTagName("textarea");
for(var i=0;i<colInputs.length; i++){
if(colInputs[i].type=="text" || colInputs[i].type=="password"){
colInputs[i].onfocus = function(){this.select();}
}
}
for(var i=0;i<colTextarea.length; i++){
colTextarea[i].onfocus = function(){this.select();}
}

}
</script>
</head>

<body>

<form action="" method="get" name="form1">
<input type="text" id="txt1" name="text1" value="用户名" /><br />
<input type="button" value="提交" onclick="document.forms[0].reset()" /><br />
<input type="image" src="images/tj.gif" alt="" /><br />
<input type="text" name="" id="" value="这是密码" onblur="alert('Blur')" onchange="alert('change')" />
<textarea name="" id="" onfocus="this.select()" cols="30" rows="10">这是爱的呼唤</textarea>
</form>

</body>
</html>

表单的简单练习