Showing results for 
Search instead for 
Did you mean: 
Regular Visitor

Lookup() label text vanishes a moment after loading

Hi everyone. I'm new to Power Apps, and am wondering if any of you can help me with this strange little bug I'm experiencing.


I have an edit form with a datacard that displays a barcode value from a sharepoint list. The value of the datacard can be changed by the user, either by typing, or by using the built-in barcode scanner functionality, then submitted if desired. All this works great, the barcode is in the datacard value box.


Within that same datacard, I have a label that grabs the datacard value, and uses the LookUp() function on the sharepoint list to retrieve and display the title associated with the barcode. It uses the function below in it's "text" property:


LookUp('List of Devices', OData__dlc_BarcodeValue=DataCardValue37.Text).Title

     (where DataCardValue37 contains the barcode)


This all works great within the app editor, but gets weird when fully run in the browser or on my android phone. Sometimes these lookup() labels work, but sometimes they load and display for a moment, then immediately disappear. I find that it happens more often on my phone. Updating the barcode field by backspacing and retyping the last number causes the lookup() label to reload and display properly again.


Strangely, I have the exact same lookup() label setup on a detail form, and it works just fine every time.


Any ideas of what's going on? Why does this work on a detail form but not an edit form? Is there any way I can force the labels to refresh themselves a moment after the page loads so that their text reappears? Any help you might able to provide would be highly appreciated.






Accepted Solutions

Hi WarrenBelz, thanks again so much for your help.


I like that idea, except this title also needs to respond to users manually typing barcodes into the barcode edit form box. Is there a way to make the variable detect and respond to when a user has typed in a textbox?


In other words this variable needs to perform its lookup on the most recently updated of the following: The default barcode value (what it was set to before the edit screen was loaded), the value from the barcode scanner, and the user's typing input into the edit form's barcode DataCardValue. Referencing this DataCardvalue is what seems to cause all these issues.

View solution in original post

Super User
Super User

Hi @Tomato_Pie ,

This could be a calculation timing issue - try this OnScan of the scanner

      'List of Devices', 

then set your label to varTitle


Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

Hm, no luck.


I put your code in the OnScan, and set the label to varTitle. This of course makes the label blank until the scanner button is pressed, so I changed it to:


If(IsBlank(varTitle),LookUp('List of Devices', OData__dlc_BarcodeValue=DataCardValue36.Text).Title,varTitle)


This produced the same problematic behaviour as before, where the label immediately goes blank upon page load and does not refill itself until the barcode datacard value is updated (either by typing, or by scanning a barcode with or without the code you provided in the OnScan).


Is it possible the label is calculating itself before the app has fully loaded the datacard barcode values from the sharepoint list? But then why does it often display the correct info for a moment then immediately disappear? Could it be somehow bringing text over prom the previous detail form page? Maybe I should look into somehow implementing a timer that writes to the label a moment after the page loads, undoing whatever shenanigans is happening at the start? Not exactly an elegant solution though.


Any other ideas you guys might have would be highly appreciated!


@Tomato_Pie ,

Very strange as 

      'List of Devices', 

should simply give your the lookup on the value in DataCardValue36 (you might have a read of the first section of this blog of mine in regard to this name). I am assuming there is data in this control that can be referenced?


Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

Sorry yes, DataCardValue36, DataCardValue37, ...38, etc are all part of similar datacards in an edit form (you can see the first few in the image I posted). Each datacard's value box by default displays barcode from a sharepoint list as part of the edit form, and I've put a label right beside it that looks up the associated item's title in another sharepoint list. I used number 37 in my original post, and 36 in my reply - both datacards & their lookup labels are set up in identical ways and are experiencing the same issue. I should have been consistent, my bad!

Hi @Tomato_Pie ,

The control referenced does not matter if it contains a barcode value from your list. My point was that the formula should display the Title of either that record or the scanned barcode. There is something else missing here.


Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

Hi WarrenBelz,


Thank you so much for your kind replies, your help is tremendously appreciated - I've been struggling with this issue for a while now!


I'm not sure if I understand what you're referencing. Displaying the title associated with the barcode is the entire intended function. The DataCardValues are indeed populated with the barcodes from when the page loads onwards.


I use the lookup function instead of ThisItem.Title for example because there are two different sharepoint lists - 'List of Devices' is not the same list as the one associated with the edit form.


I still don't know why my lookup label blanks out even though the barcode is there from the start. No other controls interact with the label.

OK @Tomato_Pie ,

A bit of basic debugging - if you put this on a label, does it always contain the Title when there is data to reference in DataCardValue36 ?

   'List of Devices', 


Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

Hi WarrenBelz,


No - DataCardVaue36 is always populated by data, but the label does not always display the title.


Upon page load, the title in the label sometimes displays for a moment, then disappears. Sometimes it never displays. Sometimes it displays without issue. It has a mind of it's own! DataCardValue36 always has data though.


Refreshing DataCardValue36 in any way, such as backspacing the last digit of it's barcode and retyping it, will cause the title in the label to reappear. Going backwards to the last screen then returning to the problematic screen can also fix things. It's mostly upon visiting the screen for the first time upon opening the app that the titles disappear.

@Tomato_Pie ,

I think you have a corruption somewhere. Try putting another card on the screen based on the field that DataCardValue36 has, then reference that will the Lookup.


Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

Helpful resources


Power Platform Connections Ep 14 | J. Panchal | Thursday, 18 May 2023

Episode Fourteen of Power Platform Connections sees David Warner and Hugo Bernier talk to Microsoft PM Jocelyn Panchal, alongside the latest news, videos, product reviews, and community blogs.   Use the hashtag #PowerPlatformConnects on social media for a chance to have your work featured on the show.      Show schedule in this episode:  00:00 Cold Open 00:32 Show Intro 01:10 Jocelyn Panchal Interview 24:10 Blogs & Articles 29:50 Outro & Bloopers  Check out the blogs and articles featured in this week’s episode:;focus=STRATP_com_cm4all_wdn_Flatpress_42136159&path=?x=entry:entry230511-101930#C_STRATP_com_cm4all_wdn_Flatpress_42136159__-anchor  @NathLeenders  @MrKeithAtherton  @MrCaptainKarim @pranavkhuranauk  @thevictordantas  Action requested: Feel free to provide feedback on how we can make our community more inclusive and diverse.  This episode premiered live on our YouTube at 12pm PST on Thursday 18th May 2023.  Video series available at Power Platform Community YouTube channel.  Upcoming events:  Power Apps Developers Summit – May 19-20th - London European Power Platform conference – Jun. 20-22nd - Dublin Microsoft Power Platform Conference – Oct. 3-5th - Las Vegas  Join our Communities:  Power Apps Community Power Automate Community Power Virtual Agents Community Power Pages Community  If you’d like to hear from a specific community member in an upcoming recording and/or have specific questions for the Power Platform Connections team, please let us know. We will do our best to address all your requests or questions.   

May 2023 Community Newsletter and Upcoming Events

Welcome to our May 2023 Community Newsletter, where we'll be highlighting the latest news, releases, upcoming events, and the great work of our members inside the Biz Apps communities. If you're new to this LinkedIn group, be sure to subscribe here in the News & Announcements to stay up to date with the latest news from our ever-growing membership network who "changed the way they thought about code".       LATEST NEWS "Mondays at Microsoft" LIVE on LinkedIn - 8am PST - Monday 15th May  - Grab your Monday morning coffee and come join Principal Program Managers Heather Cook and Karuana Gatimu for the premiere episode of "Mondays at Microsoft"! This show will kick off the launch of the new Microsoft Community LinkedIn channel and cover a whole host of hot topics from across the #PowerPlatform, #ModernWork, #Dynamics365, #AI, and everything in-between. Just click the image below to register and come join the team LIVE on Monday 15th May 2023 at 8am PST. Hope to see you there!     Executive Keynote | Microsoft Customer Success Day CVP for Business Applications & Platform, Charles Lamanna, shares the latest #BusinessApplications product enhancements and updates to help customers achieve their business outcomes.     S01E13 Power Platform Connections - 12pm PST - Thursday 11th May Episode Thirteen of Power Platform Connections sees Hugo Bernier take a deep dive into the mind of co-host David Warner II, alongside the reviewing the great work of Dennis Goedegebuure, Keith Atherton, Michael Megel, Cat Schneider, and more. Click below to subscribe and get notified, with David and Hugo LIVE in the YouTube chat from 12pm PST. And use the hashtag #PowerPlatformConnects on social media for a chance to have your work featured on the show.     UPCOMING EVENTS   European Power Platform Conference - early bird ticket sale ends! The European Power Platform Conference early bird ticket sale ends on Friday 12th May 2023! #EPPC23 brings together the Microsoft Power Platform Communities for three days of unrivaled days in-person learning, connections and inspiration, featuring three inspirational keynotes, six expert full-day tutorials, and over eighty-five specialist sessions, with guest speakers including April Dunnam, Dona Sarkar, Ilya Fainberg, Janet Robb, Daniel Laskewitz, Rui Santos, Jens Christian Schrøder, Marco Rocca, and many more. Deep dive into the latest product advancements as you hear from some of the brightest minds in the #PowerApps space. Click here to book your ticket today and save!      DynamicMinds Conference - Slovenia - 22-24th May 2023 It's not long now until the DynamicsMinds Conference, which takes place in Slovenia on 22nd - 24th May, 2023 - where brilliant minds meet, mingle & share! This great Power Platform and Dynamics 365 Conference features a whole host of amazing speakers, including the likes of Georg Glantschnig, Dona Sarkar, Tommy Skaue, Monique Hayward, Aleksandar Totovic, Rachel Profitt, Aurélien CLERE, Ana Inés Urrutia de Souza, Luca Pellegrini, Bostjan Golob, Shannon Mullins, Elena Baeva, Ivan Ficko, Guro Faller, Vivian Voss, Andrew Bibby, Tricia Sinclair, Roger Gilchrist, Sara Lagerquist, Steve Mordue, and many more. Click here: DynamicsMinds Conference for more info on what is sure an amazing community conference covering all aspects of Power Platform and beyond.    Days of Knowledge Conference in Denmark - 1-2nd June 2023 Check out 'Days of Knowledge', a Directions 4 Partners conference on 1st-2nd June in Odense, Denmark, which focuses on educating employees, sharing knowledge and upgrading Business Central professionals. This fantastic two-day conference offers a combination of training sessions and workshops - all with Business Central and related products as the main topic. There's a great list of industry experts sharing their knowledge, including Iona V., Bert Verbeek, Liza Juhlin, Douglas Romão, Carolina Edvinsson, Kim Dalsgaard Christensen, Inga Sartauskaite, Peik Bech-Andersen, Shannon Mullins, James Crowter, Mona Borksted Nielsen, Renato Fajdiga, Vivian Voss, Sven Noomen, Paulien Buskens, Andri Már Helgason, Kayleen Hannigan, Freddy Kristiansen, Signe Agerbo, Luc van Vugt, and many more. If you want to meet industry experts, gain an advantage in the SMB-market, and acquire new knowledge about Microsoft Dynamics Business Central, click here Days of Knowledge Conference in Denmark to buy your ticket today!   COMMUNITY HIGHLIGHTS Check out our top Super and Community Users reaching new levels! These hardworking members are posting, answering questions, kudos, and providing top solutions in their communities.   Power Apps:  Super Users: @WarrenBelz, @LaurensM  @BCBuizer  Community Users:  @Amik@ @mmollet, @Cr1t    Power Automate:  Super Users: @Expiscornovus , @grantjenkins, @abm  Community Users: @Nived_Nambiar, @ManishSolanki    Power Virtual Agents:  Super Users: @Pstork1, @Expiscornovus  Community Users: @JoseA, @fernandosilva, @angerfire1213    Power Pages: Super Users: @ragavanrajan  Community Users: @Fubar, @Madhankumar_L,@gospa  LATEST COMMUNITY BLOG ARTICLES  Power Apps Community Blog  Power Automate Community Blog  Power Virtual Agents Community Blog  Power Pages Community Blog  Check out 'Using the Community' for more helpful tips and information:  Power Apps , Power Automate, Power Virtual Agents, Power Pages 

Microsoft Power Platform Conference | Registration Open | Oct. 3-5 2023

We are so excited to see you for the Microsoft Power Platform Conference in Las Vegas October 3-5 2023! But first, let's take a look back at some fun moments and the best community in tech from MPPC 2022 in Orlando, Florida.   Featuring guest speakers such as Charles Lamanna, Heather Cook, Julie Strauss, Nirav Shah, Ryan Cunningham, Sangya Singh, Stephen Siciliano, Hugo Bernier and many more.   Register today:   

Check out the new Power Platform Communities Front Door Experience!

We are excited to share the ‘Power Platform Communities Front Door’ experience with you!   Front Door brings together content from all the Power Platform communities into a single place for our community members, customers and low-code, no-code enthusiasts to learn, share and engage with peers, advocates, community program managers and our product team members. There are a host of features and new capabilities now available on Power Platform Communities Front Door to make content more discoverable for all power product community users which includes ForumsUser GroupsEventsCommunity highlightsCommunity by numbersLinks to all communities Users can see top discussions from across all the Power Platform communities and easily navigate to the latest or trending posts for further interaction. Additionally, they can filter to individual products as well.       Users can filter and browse the user group events from all power platform products with feature parity to existing community user group experience and added filtering capabilities.     Users can now explore user groups on the Power Platform Front Door landing page with capability to view all products in Power Platform.    Explore Power Platform Communities Front Door today. Visit Power Platform Community Front door to easily navigate to the different product communities, view a roll up of user groups, events and forums.

Welcome to the Power Apps Community

Welcome! Congratulations on joining the Microsoft Power Apps community! You are now a part of a vibrant group of peers and industry experts who are here to network, share knowledge, and even have a little fun! Now that you are a member, you can enjoy the following resources:   The Microsoft Power Apps Community Forums If you are looking for support with any part of Microsoft Power Apps, our forums are the place to go. They are titled "Get Help with Microsoft Power Apps " and there you will find thousands of technical professionals with years of experience who are ready and eager to answer your questions. You now have the ability to post, reply and give "kudos" on the Power Apps community forums! Make sure you conduct a quick search before creating a new post because your question may have already been asked and answered!   Microsoft Power Apps IdeasDo you have an idea to improve the Microsoft Power Apps experience, or a feature request for future product updates? Then the "Power Apps Ideas" section is where you can contribute your suggestions and vote for ideas posted by other community members. We constantly look to the most voted Ideas when planning updates, so your suggestions and votes will always make a difference.   Community Blog & NewsOver the years, more than 600 Power Apps Community Blog Articles have been written and published by our thriving community. Our community members have learned some excellent tips and have keen insights on building Power Apps. On the Power Apps Community Blog, read the latest Power Apps related posts from our community blog authors around the world. Let us know if you would like to become an author and contribute your own writing — everything Power Apps related is welcome!   Power Apps Samples, Learning and Videos GalleriesOur galleries have a little bit of everything to do with Power Apps. Our galleries are great for finding inspiration for your next app or component. You can view, comment and kudo the apps and component gallery to see what others have created! Or share Power Apps that you have created with other Power Apps enthusiasts. Along with all of that awesome content, there is the Power Apps Community Video & MBAS gallery where you can watch tutorials and demos by Microsoft staff, partners, and community gurus in our community video gallery.   Again, we are excited to welcome you to the Microsoft Power Apps community family! Whether you are brand new to the world of process automation or you are a seasoned Power Apps veteran. Our goal is to shape the community to be your ‘go to’ for support, networking, education, inspiration and encouragement as we enjoy this adventure together!   Let us know in the Community Feedback if you have any questions or comments about your community experience.To learn more about the community and your account be sure to visit our Community Support Area boards to learn more! We look forward to seeing you in the Power Apps Community!The Power Apps Team

Top Solution Authors
Top Kudoed Authors
Users online (2,443)