Problem with multiple form submission should be handled server-side. The two issues: data integrity and user friendliness should be addressed in the coding. If you do not want to allow same submissions entered twice, verify that there is no existing record with submitted data before inserting a new one. Another possibility is to have a timestamp for each record and allow only one submission from user within a certain time period.
User friendliness is accomplished by delivering part of the page before starting the form data processing:
- when the form is recieved output the page header open body tag and a simple paragraph:
Please wait while your submission is being processed
- flush the output buffer and then start form processing
- when done with form processing output the resulting page with a style element:
You can use client side scripting to help reduce the server side load.
The simplest and most reliable way of preventing multiple form submissions is adding the following line at the end of your data verification function:
Code:
function verify(form)
{ /* your form verification here */
form.onsubmit = function(){return false;}
return true;
}
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