Introduction to the use of form OnSubmit and input type=image

If there is an <input type="image"> here, then pressing this image directly will submit the form.

If there is OnSubmit, this function will be executed first. If it returns false, the form will not be submitted!

Copy code

The code is as follows:

<span style="font-size:14px;"><script language=javascript>
function test()
{
alert("Test!")
}
</script>
<form name="F1" onSubmit="fuck();">
<input type="image" src="" width="51" height="20">
</form></span>

Another example:

Copy code

The code is as follows:

<html>
</head>
<script language="javascript">
function checkEmpty(form){
for(i=0;i<form.length;i++){
alert(form.elements[i].value);
if( form.elements[i].value=="" ){
alert("Form information cannot be empty");
return false;
}
}
}
</script>
<body>
<form name="form" method="post" onSubmit="return checkEmpty(form)">
<input name="name" type="text" size="17">
<input name="password" type="password" size="17">
<input type="image" src="" width="51" height="20">
<input type="button" value="AAA" />
</form>
</body>
<html>

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