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The problem was that if the user was very quick i.e. double/triple clicking on the **Create** button, then it was possible to create duplicate rows on the database with exactly the same data. In APEX 5.1, you have a few options available in the page attributes that concern how to handle a page submission. Namely: - Enable Duplicate Page submissions - Yes – Enable page to be re-posted - No – Prevent page from being re-posted - Reload on Submit (New Feature for 5.1) - Always - Only For Success   My page was set to the default options for these attributes in a new APEX 5.1 modal dialog page; Enable Duplicate Page submissions was set to ‘Yes’ and Reload on Submit was set to ‘Only for Success’. Excellent I thought, all I need to do here is change Enable Duplicate Page submissions to ‘No – Prevent page from being re-posted’ and my problem would be solved! However, I hit a problem. Because all of the validations on the page were custom server side validations which occur ***after*** the submit; if any of them failed then it would no longer be possible for the user to submit the page at all, even if they corrected all validation errors, and they would be presented with: [![Validations and Duplicate Page Submissions in APEX 5.1](https://content.dsp.co.uk/hs-fs/hubfs/Imported_Blog_Media/1-Nov-25-2020-10-13-31-43-AM.png?width=525&name=1-Nov-25-2020-10-13-31-43-AM.png)](https://content.dsp.co.uk/hubfs/Imported_Blog_Media/1-Nov-25-2020-10-13-31-43-AM.png) Had all the page validations been client side (i.e. the ones that appear on the item attributes like ‘Value Required’ or ‘Subtype’) then this wouldn’t have been a problem as all of these validations occur client side ***before*** the ‘submit’. However, as the page has a number of dynamically displayed items and other required custom validations to do with the dataset I require some more advanced server side validations written in PL/SQL on my page. Let us look at the new option for APEX 5.1; Reload on Submit. What this does when set to ‘Only on Success’ is handle the server side validations in a much nicer way so that the page doesn’t completely reload on submit when validation errors occur and instead the validations ***look*** like they behave how they do with client side validations and the errors are displayed without the page re-loading. This is much nicer than in 5.0.x versions of APEX and greatly improves the user experience and performance of a page so I really want to keep this behaviour! So the next thing I did, to try and stop the duplicate page submissions, was set Enable Duplicate Page submissions back to ‘Yes’ and applied a different fix we commonly use to stop duplicate page submissions. On the button used to submit the page, we add a dynamic action, which fires on the click of the button, which has a JavaScript action of disabling the button (to stop the user pressing it again) and then submitting the page: [![Validations and Duplicate Page Submissions in APEX 5.1](https://content.dsp.co.uk/hs-fs/hubfs/Imported_Blog_Media/2-Nov-25-2020-10-13-32-20-AM.png?width=297&height=145&name=2-Nov-25-2020-10-13-32-20-AM.png)](https://content.dsp.co.uk/hubfs/Imported_Blog_Media/2-Nov-25-2020-10-13-32-20-AM.png) [![Validations and Duplicate Page Submissions in APEX 5.1](https://content.dsp.co.uk/hs-fs/hubfs/Imported_Blog_Media/3-Nov-25-2020-10-13-32-96-AM.png?width=470&height=185&name=3-Nov-25-2020-10-13-32-96-AM.png)](https://content.dsp.co.uk/hubfs/Imported_Blog_Media/3-Nov-25-2020-10-13-32-96-AM.png) (Don’t forget to give your button a static ID. I called mine CREATE_BUTTON). Great, let’s give that a try (and deliberately cause some of my server side validations to fire): [![Validations and Duplicate Page Submissions in APEX 5.1](https://content.dsp.co.uk/hs-fs/hubfs/Imported_Blog_Media/4-1.gif?width=556&height=405&name=4-1.gif)](https://content.dsp.co.uk/hubfs/Imported_Blog_Media/4-1.gif)Darn! the button is disabled but I need to press it again after correcting my validation errors, what’s caused this? Well, it’s that option I just talked about: ‘Reload on Submit’. Because this is set to ‘Only for success’ the page hasn’t reloaded after validation errors and my button is still disabled. So in order to use my fix to stop the button from being pressed twice I need to set this back to ‘Always’ and lose the niceness of the way server side validations are handled in APEX 5.1. So, for the moment* if you have page where you want to detect or handle duplicate page submissions you have the following options: 1. Set Enable Duplicate Page submissions to No **but** you will have to keep all your page validations Client Side using either the item attributes or some client side javascript. 2. Set Enable Duplicate Page submissions to Yes and use the fix above to disable the button when the button is pressed **but** you will then HAVE to have the Reload on Submit option set to Yes in order for the button to be re-enabled if any validation errors occur. 3. Add something at database level (unique index on the non-null columns or a trigger) which detects the duplicates and removes them (not ideal!) 4. Have a JS timer on the page which looks for any of the validation text and re-enables the button or hook in to [apex.message.showErrors](http://docs.oracle.com/database/apex-5.1/AEAPI/apex-message-namespace.htm#AEAPI-GUID-230C2CC1-B721-4037-8384-7B5369F35A2F) in order to re-enable the button when errors on the page have occurred. *Oracle have acknowledged that this behaviour is a bug, see [here](https://community.oracle.com/thread/4045399). So hopefully in APEX 5.2 we will be able to have the best of both worlds! For more information, check out our [Oracle APEX Services](https://www.dsp.co.uk/oracle-apex-services), and if you liked this blog, check out our other [APEX blogs here](https://content.dsp.co.uk/apex). [Contact us](https://www.dsp.co.uk/contact-us) today, and one of our expert developers will be in touch. ---   **Author**: [Paul Jones](https://content.dsp.co.uk/apex/author/paul-jones) **Job Title**: Oracle APEX Development Consultant **Bio**: Paul is a Development Consultant at DSP. Paul has a BSc in Computing from the University of Leeds and is now building on considerable experience in development and support using Oracle PL/SQL and Oracle E-Business Suite (EBS). Paul is employing APEX to provide quality, bespoke software solutions both internally and to a range of organisations.   ---   [APEX 5.1](https://content.dsp.co.uk/topic/apex-5-1) [Validation](https://content.dsp.co.uk/topic/validation) [APEX](https://content.dsp.co.uk/topic/apex) [Oracle APEX](https://content.dsp.co.uk/topic/oracle-apex) [13-Jan-2016 13:43:54 Querying Data in Oracle Forms vs APEX ](https://content.dsp.co.uk/datablock-vs-ir) [16-Sep-2019 10:53:12 3 Reasons to use Inline Dialogs ](https://content.dsp.co.uk/3-reasons-to-use-inline-dialogs) [07-Oct-2019 09:47:38 How Do I Access My Free Oracle Cloud Database ](https://content.dsp.co.uk/how-do-i-access-my-free-oracle-cloud-database) [Previous Generating PDF and Word Documents from an APEX application ](https://content.dsp.co.uk/generating-pdf-word-documents-apex-application) [Next ODA X7 – more than just a hardware refresh ](https://content.dsp.co.uk/oda-x7-upgrade) #### Contact Sales Enquiries [+44 (0) 203 880 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[Derby](https://www.google.com/maps/place/Cubo+Pride+Park/@52.9142877,-1.4558952,331m/data=!3m2!1e3!5s0x4879f10728c1eea1:0x877f85530d38bf6!4m15!1m8!3m7!1s0x4879f1072b0e2ebb:0x7c717035ff049b12!2sPride+Pl,+Derby+DE24+8QR!3b1!8m2!3d52.913692!4d-1.4543743!16s%2Fg%2F1th7mf0r!3m5!1s0x4879f16809382b33:0x6fccc05b8500d970!8m2!3d52.914146!4d-1.4544105!16s%2Fg%2F11w4j8v8z2?entry=ttu&g_ep=EgoyMDI1MDYyMi4wIKXMDSoASAFQAw%3D%3D) [DE24 8QR](https://www.google.com/maps/place/Cubo+Pride+Park/@52.9142877,-1.4558952,331m/data=!3m2!1e3!5s0x4879f10728c1eea1:0x877f85530d38bf6!4m15!1m8!3m7!1s0x4879f1072b0e2ebb:0x7c717035ff049b12!2sPride+Pl,+Derby+DE24+8QR!3b1!8m2!3d52.913692!4d-1.4543743!16s%2Fg%2F1th7mf0r!3m5!1s0x4879f16809382b33:0x6fccc05b8500d970!8m2!3d52.914146!4d-1.4544105!16s%2Fg%2F11w4j8v8z2?entry=ttu&g_ep=EgoyMDI1MDYyMi4wIKXMDSoASAFQAw%3D%3D) ** [Dublin](https://www.google.com/maps/search/Inniscarra,+Main+Street,+Rathcoole,+Dublin/@53.2810032,-6.4764674,17z/data=!3m1!4b1?entry=ttu)** [Inniscarra,](https://www.google.com/maps/search/Inniscarra,+Main+Street,+Rathcoole,+Dublin/@53.2810032,-6.4764674,17z/data=!3m1!4b1?entry=ttu) [Main Street,](https://www.google.com/maps/search/Inniscarra,+Main+Street,+Rathcoole,+Dublin/@53.2810032,-6.4764674,17z/data=!3m1!4b1?entry=ttu) [Rathcoole,](https://www.google.com/maps/search/Inniscarra,+Main+Street,+Rathcoole,+Dublin/@53.2810032,-6.4764674,17z/data=!3m1!4b1?entry=ttu) [Dublin](https://www.google.com/maps/search/Inniscarra,+Main+Street,+Rathcoole,+Dublin/@53.2810032,-6.4764674,17z/data=!3m1!4b1?entry=ttu) #### About Us DSP is a Data Management and Cloud Platform MSP that delivers enterprise grade support & consulting services for Oracle, Microsoft and Multi-Cloud technologies. ![Oracle Partner](https://content.dsp.co.uk/hubfs/logo-2021/Partner-logos/Oracle-logos/Colour/o-prtnr-cmyk-250.png) ![Microsoft Partner](https://content.dsp.co.uk/hubfs/Microsoft%20partner%20logos%20-%20July%202023/mic-sol-part-colour@200x.png) ![Google 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Company Registration Number: 03898451 ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "dateModified" : "2024-10-01", "datePublished" : "2024-10-01", "headline" : "Validations and Duplicate Page Submissions in APEX 5.1", "image" : [ "https://www.dsp.co.uk/hubfs/Imported_Blog_Media/1-Nov-25-2020-10-15-58-57-AM.png" ], "mainEntityOfPage" : { "@id" : "https://content.dsp.co.uk/validations-and-duplicate-page-submissions-in-apex-5-1", "@type" : "WebPage" } } ```