I have the typical HTML "contact me" page, i.e. name, e-mail address and message. Since I want to do input validation on the page itself using JavaScript, I can't use a submit button, otherwise, the attached JavaScript function would be ignored. At least that's how I understand it, CMIIW.
I tried to load the next page writing location = mail.php but it appears that the form parameters don't get passed to my PHP page this way.
How do I validate input in JavaScript and pass parameters to my PHP page when ok?
TIA
Steven
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5 Answers
You can use a form with an onsubmit handler on it, that returns false if the validation failed. If the check is ok, return true and the form will submit normally.
You'd have a javascript function something like this:
function check_it_all() {
if (all_ok) {
return true;
} else {
return false;
}
}
And the form
<form action=..... onsubmit="return check_it_all();">
....
</form>
Comments
Use the onSubmit event. Attach it to your form and if it returns true then your form will be sent to the PHP page. Read more here.
1 Comment
stevenvh
Accepted for being first and to the point, even though scompt was too lazy to spell the solution out. But I can understand that; it's a hot day. :-)
You should still use the submit button to submit the form, that is the correct behavior.
Input validation should be done using the <FORM>'s onSubmit event.
It should look something like this:
<script>
function validate() {
var isFormValid = whatever; // validate form
return isFormValid;
}
</script>
<form action="your.php" method="POST" onSubmit="return validate()">
<!---fields--->
</form>
1 Comment
Quentin
You need to capture the return value of the validate method in your onsubmit handler.
The function validate() returns a bool.
This will stop the submission if validate() returns false.
<input type="submit" onclick="return validate()" value="click" />
I am an aspx.net developer so I am used to putting the validation call on the button.
Comments
If possible can't you use a JavaScript library like Jquery? It probably would make your life alot easier and they have tons of plug-ins for validation.
Such as
http://bassistance.de/jquery-plugins/jquery-plugin-validation/
