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What does submit mean?
- 藏色散人Original
- 2019-05-20 09:12:0125737browse
The Submit object represents a submit button in an HTML form. Every time the 54b28e0e73a12e4a8ed487872a6fb5b8 tag appears in an HTML form, a Submit object is created.
Before the form is submitted, the onclick event handler is triggered, and a handler can cancel the form submission by returning false.
See Form.submit() method and Form.onsubmit event handler.
You can access a submit button by looping through the form's elements[] array, or by using document.getElementById().
IE: Internet Explorer, F: Firefox, O: Opera, W3C: W3C Standard.
Example
<html>
<head>
<script type="text/javascript">
function validate()
{
var at=document.getElementById("email").value.indexOf("@")
var age=document.getElementById("age").value
var fname=document.getElementById("fname").value
submitOK="true"
if (fname.length>10)
{
alert("名字必须小于 10 个字符。")
submitOK="false"
}
if (isNaN(age)||age<1||age>100)
{
alert("年龄必须是 1 与 100 之间的数字。")
submitOK="false"
}
if (at==-1)
{
alert("不是有效的电子邮件地址。")
submitOK="false"
}
if (submitOK=="false")
{
return false
}
}
</script>
</head>
<body>
<form action="/example/hdom/hdom_submitpage.html" onsubmit="return validate()">
名字（最多 10 个字符）：<input type="text" id="fname" size="20"><br />
年龄（从 1 到 100）：<input type="text" id="age" size="20"><br />
电子邮件：<input type="text" id="email" size="20"><br />
<br />
<input type="submit" value="提交">
</form>
</body>
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