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Safe "Submit" Button

, 5 May 2013 CPOL
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How to send data from HTML form to server safely

Introduction

When a user on web form presses "Submit" button for sending data to web server, then the web server runs a script, query, etc. This may take uncertain time up to 1 minute. But the user sees a static page and may think: "I did not press the button or something is wrong" and press the button again many times. So the web server may get many HTML queries. This will increase CPU usage on the server and may return incorrect results.

Background

The idea is simple.

  • Step 0 (may skip): Check the form: run function "OnSubmit" in tag FORM, check tag INPUT ("required" and "pattern" attributes).
  • Step 1: Change text on the button to "Please wait...".
  • Step 2: Disable the button.
  • Step 3: Send query.

Using the Code

Just add code to input tag:

    <input type="submit" name="Submit" value="Submit"  
önclick = "this.form.check(); this.value='Please wait...'; this.disabled=true; this.form.submit();" />    

So see 'on click' event.

Step 0. Check the Form

this.form.check();

Step 1. Change Text on the Button

this.value='Please wait...';

Step 2. Disable the Button

this.disabled=true;

Step 3. Press the Button Programmatically

this.form.submit();

Points of Interest

See also:

History

  • 1.1 | Added Step 0: Check form | 06.05.2013

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Style-7
Ukraine Ukraine
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Comments and Discussions

 
SuggestionClient side validation leaves button disabled Pin
Robert J. Good8-May-13 4:30
memberRobert J. Good8-May-13 4:30 
QuestionYou can do with PRG Pattern easily Pin
rjgadag5-May-13 22:55
memberrjgadag5-May-13 22:55 
GeneralMy vote of 5 Pin
M Rayhan1-May-13 1:45
memberM Rayhan1-May-13 1:45 
GeneralMy vote of 5 Pin
Jayanta Chatterjee25-Apr-13 2:39
memberJayanta Chatterjee25-Apr-13 2:39 
GeneralMy vote of 5 Pin
dgDavidGreene24-Apr-13 9:26
memberdgDavidGreene24-Apr-13 9:26 
Simple and clever

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