cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
jhn1
Advocate II
Advocate II

Onchange event often triggers when screen becomes visible (date picker control)

Greetings PowerAppers,

 

I have a date picker control on an edit form in an app I am finishing up.  The form and the data card are in Edit mode.

There are a few formulas in the control's OnChange event to trap for errors and Patch the date change if no error is found.  Often, when I navigate to that screen, the OnChange event is fired immediately - without me even touching the control!  I get a notification that should only be displayed when a user is trying to change the date.  It doesn't happen every time the form becomes visible.  But, often. There is another date picker control on the same form and it is behaving normally.  

This is very puzzling and I am not sure what to do.  Does anyone have any advice for me?

jhn1

1 ACCEPTED SOLUTION

Accepted Solutions

I solved my issue.  It turns out that there is a bug in PowerApps such that simply changing records triggers the OnChange event of my DatePicker control when my gallery’s selection moved to a record with a different date.  In other words, if the StartDate was the same in the newly selected record, OnChange did not get fired.  If the StartDate was different, it did.  The seemingly random behavior was not random at all.  What seemed to be triggering the problem (OnVisible of new screen) was actually the change of gallery selection (different record.)

Once I realized what was happening, I was able to alter my formula such that it only executes when the user attempts to alter the date inside the control.  To do this, I wrapped my long OnChange formula in this If statement:

    If(ThisItem.StartDate <> dateValueStartDate.SelectedDate,
                         [my long formula]
    )

This means: only execute the long formula if the date’s been altered by the user and not yet saved. 

 

-jhn

View solution in original post

10 REPLIES 10
v-xida-msft
Community Support
Community Support

Hi @jhn1,

 

Could you please share a bit more about the formula within the OnChange property of the DatePicker control?

 

I have made a test on my side, and don't have the issue that you mentioned. The GIF screenshot as below:Test1.gif

 

 

Set the OnChange property of the DatePicker control to following formula:

Notify("Date is changed",NotificationType.Success)

When the Date is changed, the message would show up.

 

Please take a try to re-create your app, then check if the issue is solved.

 

If the issue still exists, please take a try to delete the DatePicker control from the corresponding Data card, and then re-add a new DatePicker control within it, then check if the issue still exists.

 

More details about deleting the DatePicker control from corresponding Data card and re-add a new one within it, please check the following GIF image:Test1.gif

 

 

 

Best regards,

Kris

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Thank you, @v-xida-msft for your response.  I tried recreating the datepicker control and had the same issue.  The OnChange event was fired when the screen became visible.  I didn't touch the datepicker control to get this result.

 

Here is the code in my datepicker's OnChange event. 

If(
    CountIf(
        '[dbo].[tblAssignments]',
        AProjectID = galProjects.Selected.ProjectID
    ) = 0,
    If(
        dateValueStartDate.SelectedDate > dateValueEndDate.SelectedDate Or Weekday(
            dateValueStartDate.SelectedDate,
            StartOfWeek.Monday
        ) <> 1,
        Notify(
            "Please check the project's start date for an error. The start date must be before the end date and must be a Monday.",
            NotificationType.Information
        ),
        Patch(
            '[dbo].[tblProjects]',
            galProjects.Selected,
            {StartDate: dateValueStartDate.SelectedDate}
        )
    ),
    Notify(
        "You can't adjust the start date of this project.  Assignments have been scheduled which may conflict with your changes.  To adjust the project start date, please delete all the project's assignments and try again.",
        NotificationType.Information
    ),
    Reset(dateValueStartDate)
)

The notification that is displayed when the screen becomes visible is the one that starts with "You can't adjust the start date of..." Any insights would be appreciated.

 

Thank you!

 

-jhn1

I solved my issue.  It turns out that there is a bug in PowerApps such that simply changing records triggers the OnChange event of my DatePicker control when my gallery’s selection moved to a record with a different date.  In other words, if the StartDate was the same in the newly selected record, OnChange did not get fired.  If the StartDate was different, it did.  The seemingly random behavior was not random at all.  What seemed to be triggering the problem (OnVisible of new screen) was actually the change of gallery selection (different record.)

Once I realized what was happening, I was able to alter my formula such that it only executes when the user attempts to alter the date inside the control.  To do this, I wrapped my long OnChange formula in this If statement:

    If(ThisItem.StartDate <> dateValueStartDate.SelectedDate,
                         [my long formula]
    )

This means: only execute the long formula if the date’s been altered by the user and not yet saved. 

 

-jhn

Anonymous
Not applicable

Thank you jhn,

 

I have encountered the same problem and developed the same solution. I searched for anyone else with this problem so I could validate that it works. So YES, this solution works.

Anonymous
Not applicable

Adding to the solution, if the date is allowed to be blank then an additional level of if..then is required.

 

 If(!IsBlank(dcvEmailStopDate.SelectedDate),

             If(dcvEmailStopDate.SelectedDate=ThisItem.StopDate, UpdateContext({EmailChange:false}), UpdateContext({EmailChange:true})), If(IsBlank(ThisItem.StopDate), UpdateContext({EmailChange:false}), UpdateContext({EmailChange:true})))

Anonymous
Not applicable

Thanks @jhn1 for the solution. I have experienced that same issue!

Anonymous
Not applicable

Thank you @jhn1 this is actually still an issue, and you solutions fixes it

I have found this too. I could not work out how a local variable could be both true & false at the same time.

Thanks for this information.

Is there a link explaining this known bug with Microsoft that you are aware of? Need it for a meeting I have around this issue with my work collegues. 

Helpful resources

Announcements

Community will be READ ONLY July 16th, 5p PDT -July 22nd

Dear Community Members,   We'd like to let you know of an upcoming change to the community platform: starting July 16th, the platform will transition to a READ ONLY mode until July 22nd.   During this period, members will not be able to Kudo, Comment, or Reply to any posts.   On July 22nd, please be on the lookout for a message sent to the email address registered on your community profile. This email is crucial as it will contain your unique code and link to register for the new platform encompassing all of the communities.   What to Expect in the New Community: A more unified experience where all products, including Power Apps, Power Automate, Copilot Studio, and Power Pages, will be accessible from one community.Community Blogs that you can syndicate and link to for automatic updates. We appreciate your understanding and cooperation during this transition. Stay tuned for the exciting new features and a seamless community experience ahead!

Summer of Solutions | Week 4 Results | Winners will be posted on July 24th

We are excited to announce the Summer of Solutions Challenge!   This challenge is kicking off on Monday, June 17th and will run for (4) weeks.  The challenge is open to all Power Platform (Power Apps, Power Automate, Copilot Studio & Power Pages) community members. We invite you to participate in a quest to provide solutions in the Forums to as many questions as you can. Answers can be provided in all the communities.    Entry Period: This Challenge will consist of four weekly Entry Periods as follows (each an “Entry Period”)   - 12:00 a.m. PT on June 17, 2024 – 11:59 p.m. PT on June 23, 2024 - 12:00 a.m. PT on June 24, 2024 – 11:59 p.m. PT on June 30, 2024 - 12:00 a.m. PT on July 1, 2024 – 11:59 p.m. PT on July 7, 2024 - 12:00 a.m. PT on July 8, 2024 – 11:59 p.m. PT on July 14, 2024   Entries will be eligible for the Entry Period in which they are received and will not carryover to subsequent weekly entry periods.  You must enter into each weekly Entry Period separately.   How to Enter: We invite you to participate in a quest to provide "Accepted Solutions" to as many questions as you can. Answers can be provided in all the communities. Users must provide a solution which can be an “Accepted Solution” in the Forums in all of the communities and there are no limits to the number of “Accepted Solutions” that a member can provide for entries in this challenge, but each entry must be substantially unique and different.    Winner Selection and Prizes: At the end of each week, we will list the top ten (10) Community users which will consist of: 5 Community Members & 5 Super Users and they will advance to the final drawing. We will post each week in the News & Announcements the top 10 Solution providers.  At the end of the challenge, we will add all of the top 10 weekly names and enter them into a random drawing.  Then we will randomly select ten (10) winners (5 Community Members & 5 Super Users) from among all eligible entrants received across all weekly Entry Periods to receive the prize listed below. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once overall. If they are drawn multiple times, another user will be drawn at random.  Individuals will be contacted before the announcement with the opportunity to claim or deny the prize.  Once all of the winners have been notified, we will post in the News & Announcements of each community with the list of winners.   Each winner will receive one (1) Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value). NOTE: Prize is for conference attendance only and any other costs such as airfare, lodging, transportation, and food are the sole responsibility of the winner. Tickets are not transferable to any other party or to next year’s event.   ** PLEASE SEE THE ATTACHED RULES for this CHALLENGE**   Week 1 Results: Congratulations to the Week 1 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Community MembersNumber of SolutionsSuper UsersNumber of Solutions @anandm08  23 @WarrenBelz  31 @DBO_DV  10 @Amik  19 AmínAA 6 @mmbr1606  12 @rzuber  4 @happyume  7 @Giraldoj  3@ANB 6 (tie)   @SpongYe  6 (tie)     Week 2 Results: Congratulations to the Week 2 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Community MembersSolutionsSuper UsersSolutions @anandm08  10@WarrenBelz 25 @DBO_DV  6@mmbr1606 14 @AmínAA 4 @Amik  12 @royg  3 @ANB  10 @AllanDeCastro  2 @SunilPashikanti  5 @Michaelfp  2 @FLMike  5 @eduardo_izzo  2   Meekou 2   @rzuber  2   @Velegandla  2     @PowerPlatform-P  2   @Micaiah  2     Week 3 Results: Congratulations to the Week 3 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge.   Week 3:Community MembersSolutionsSuper UsersSolutionsPower Apps anandm0861WarrenBelz86DBO_DV25Amik66Michaelfp13mmbr160647Giraldoj13FLMike31AmínAA13SpongYe27     Week 4 Results: Congratulations to the Week 4 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge.   Week 4:Community MembersSolutionsSuper UsersSolutionsPower Apps DBO-DV21WarranBelz26Giraldoj7mmbr160618Muzammmil_0695067Amik14samfawzi_acml6FLMike12tzuber6ANB8   SunilPashikanti8

Check Out | 2024 Release Wave 2 Plans for Microsoft Dynamics 365 and Microsoft Power Platform

On July 16, 2024, we published the 2024 release wave 2 plans for Microsoft Dynamics 365 and Microsoft Power Platform. These plans are a compilation of the new capabilities planned to be released between October 2024 to March 2025. This release introduces a wealth of new features designed to enhance customer understanding and improve overall user experience, showcasing our dedication to driving digital transformation for our customers and partners.    The upcoming wave is centered around utilizing advanced AI and Microsoft Copilot technologies to enhance user productivity and streamline operations across diverse business applications. These enhancements include intelligent automation, AI-powered insights, and immersive user experiences that are designed to break down barriers between data, insights, and individuals. Watch a summary of the release highlights.    Discover the latest features that empower organizations to operate more efficiently and adaptively. From AI-driven sales insights and customer service enhancements to predictive analytics in supply chain management and autonomous financial processes, the new capabilities enable businesses to proactively address challenges and capitalize on opportunities.    

Updates to Transitions in the Power Platform Communities

We're embarking on a journey to enhance your experience by transitioning to a new community platform. Our team has been diligently working to create a fresh community site, leveraging the very Dynamics 365 and Power Platform tools our community advocates for.  We started this journey with transitioning Copilot Studio forums and blogs in June. The move marks the beginning of a new chapter, and we're eager for you to be a part of it. The rest of the Power Platform product sites will be moving over this summer.   Stay tuned for more updates as we get closer to the launch. We can't wait to welcome you to our new community space, designed with you in mind. Let's connect, learn, and grow together.   Here's to new beginnings and endless possibilities!   If you have any questions, observations or concerns throughout this process please go to https://aka.ms/PPCommSupport.   To stay up to date on the latest details of this migration and other important Community updates subscribe to our News and Announcements forums: Copilot Studio, Power Apps, Power Automate, Power Pages