如何使用javascript自动提交表单（onevent）？

Question

I'd like to be able to submit a form automatically on an event ( a generic form, for user tracking).

For example, create a POST to http://www.example.com/index.php?option=track&variable=variable application/x-www-form-urlencoded with stuff like

username=usernamestring
otherdata=otherdata_string
otherdata2=otherdata string 2

The actual string will be preformatted, though, because all it is is like a 'ping'. It needs to be submitted onevent, with external js ( http://example.com/scripts/js.js )

What the hay should I do? This is getting annoying.

Update: I guess I didn't really make myself clear; I have a premade form that isn't supposed to display on the page; it needs to submit on an event. The form fields do not exist on the page; all I do is link to the script on the page and it executes onLoad.

POST uri: http://www.example.com/index.php?option=track&variable=variable The arguments above (option=track and variable=variable) are not the form details (postdata).

The content type is application/x-www-form-urlencoded , and has the following keys/values.

username=usernamestring
otherdata=otherdata_string
otherdata2=otherdata string 2 (when encoded, the spaces get turned to %20's.)

I need a script that submits this when run.

Answer 1

You have to get the form object and call the submit(); function provided by HTMLFormObject .

document.getElementById('myForm').submit();

Answer 2

1) with the following, (while page is loaded), the form will be immediately autosubmited

<form action="post.php" name="FNAME" method="post">
<input type="text" name="example22" value="YOURVALUE" />
<input type="submit" />
</form>
<SCRIPT TYPE="text/JavaScript">document.forms["FNAME"].submit();</SCRIPT>

another formSubmit alternative - submits any script:

document.forms[0].submit();

2) or use button click after 2second:

<SCRIPT TYPE="text/JavaScript">setInterval(function () {document.getElementById("myButtonId").click();}, 2000);</SCRIPT>