Evoke FAQ and "Where did I go Wrong"


This section will be continually added to, adding questions asked by Evoke users and the answers given to them. It is split into sections which you can go directly to via the following links:

Running an App
Log in button appears in-active
Usually this is a browser cache problem. Try pressing control F5 to refresh the cache on a Windows device or on a mobile after the app name in the URL put "?xxx" to do the same and try again.
Users cannot login to my App
The first thing to check is that you have your EVLU file/table in your database, see EVLU reserved entity.
How does an app generated by Evoke work in Linux?
When Evoke generates an app design the user can select either .NET classic or .NET Core, selecting .NET core means the resultant web app can be hosted in Linux environment.
My running app is slow - how do I speed it up?
Check the parameter Compilation debug="true", which is automatically set by Visual Studio when you initially build your app, has been reset to "False" as this will dramatically reduce the size/footprint of your app. See deployment considerations.

Pages
Where do I start with creating an app screen?
After reviewing the main page of this user guide we suggest that you look specifically at the Building a Page section.
How do I add a data table or single record to an app screen?
There are instructions and example to add both Datagrids/Data Tables and single data elements/records to an app screen in your app design
Where is a description of all the different Widgets I can use on a page?
There is a full list and description of all the Evoke Widgets in this user guide including descriptions and examples of their use.
Can I clone/copy a segment on a page?
One of the adjust actions allows you to do this
Can I copy a page from one Page Series to another?
The actions in Page Series allow you to do this
How do I enable scrolling on or of a page?
Scrolling of a page in the Evoke Designer or on a mobile/desktop device is described in Pages.
How do I get prompts to line up across multiple segments?
The column headings look greyed out?
Ensure that show column headers is checked in the General Settings of the template.
I don't want a prompt on an entry or label field but want it to look the same as other entry or label fields?
Add underscore "_" in as the prompt, this will not be displayed but will still make the field act as if it has a prompt for prompt sizing groups or other fields with a prompt in the same segment.
I want to add a Pie Chart or other graph to my App
Use the Evoke Charting and Graphing feature in Content Type in the Pages General tab.
I want to include only an image in a segment as part of the design
Use the Image feature in Content Type in the Pages General tab.
How are datasources populated with data from my database?
There is a complete section on Populating Datasources in this user guide.
How do I change the font style or font size in my app?
Use the font override options in fonts styles and font sizes in the app settings section and Pages/colors tab.


Entities
Can I import Entity properties from my database files
The actions in Entities and Repositories provide this option
What Database files/tables/objects do I need to have and how do I set up the EVLU
The Evoke reserved Entities, along with the EVLU are explained in the Reserved Entities page.
How do I have my app users in Canada see a date in DD/MM/YY and users in the US see a date in MM/DD/YY format
The date format, currency symbol, etc are set by the Culture property in the AppUser Entity. This is fully explained in Date Format Culture property


Generating App Designs
I am getting generator warnings warnings that I have used Duplicate Page Segment widget IDs.
If you get Duplicate Page Segment warnings when you generate an app design e.g. Duplicate page segment widget id detected - PageSeries:xxxxxxx, Page:xxxxxxxx, Widget id:xxxxxxx conflicts with PageSeries:yyyyyyyy, Page:yyyyyyy, SegmentGuid:nnnnnnn then you need to create unique page segment widget IDs
Using duplicate page segment widget IDs is not a good idea for many reasons, including the fact that Evoke needs to identify page segment widgets with their component and duplicate names could potentially cause a problem, therefore the warnings process, at generation, highlights if and where you have duplicate Page Segment Widget IDs.
Use the ellipsis at the top of the "Warnings" box to copy the warnings to the clipboard and past them into a Word/Notepad document or View them full screen and then work through the Pages/segments identified and change the Segment/Widget ID in each case to something unique. When there are no more duplicates you will have no more warnings.


Visual Studio
I am not sure where to start or need more advanced help with Visual Studio.
Visual Studio is a Microsoft product. Microsoft offer some great tutorials, help and other guidance on their Visual Studio support sites.
How do I Open/load a Visual Studio solution created by Evoke
In Visual Studio select open solution (go to 'open' in the 'file' menu), then browse to the location you specified in the "target folder" setting in "Visual Studio Settings" when generating your web App in Evoke. In this folder open the *.sln file.
I built my app solution in Visual Studio and it said "no startup project" or the 'run' button in Visual Studio does not seem to be linked to a browser
Visual Studio can occasionally unlink your 'web' project as the startup project, so in Visual Studio Explorer, right click the web project and select "set as startup project".


Databases
I want to swap databases in my app i.e. from a development database to a live database
Please review the description of Swapping or changing Databases for details of the steps required to change a database
I am using a MultiValue Database, can I use my Multivalued data and existing Custom DataBasic?
Yes, full details are provided in this user guide regarding using MultiValue Databases, Mutlivalued data and existing DataBasic.
I am using a SQL Database, can I still use Joins and Link Tables?
Yes, full details are provided in this user guide regarding using Joins and Link Tables with a SQL database.
I need to select some data from my database?
please review the user guide section on Selections and then see the example of how to use a Selection on a page.


Browsers
This section is not really about Evoke but gives some generic information about browsers that address some frequently asked questions
In Chrome when I swipe down on an Android device it refreshes/reloads the App
If you are using Google Chrome in Android the "Pull to refresh feature", set by default by Chrome, refreshes the browser session and takes you right out of the app back to the login screen. However, you can disable this feature. In the Chrome Browser URL bar type the following.... chrome://flags/#disable-pull-to-refresh-effect then use the search to find "pull-to-refresh" and as this is a feature to disable the function you have "enable" this (which enables the disable - not sure they thought that one through fully) and now when you swipe down on any webpage or app in Chrome on an Android the screen does not refresh.
In Mozilla / Firefox my Lookup button widget or lookup widget is really small and I cannot see the text in the text box!
This is probably because the page segment in Evoke has been set to auto-sized and different browsers have different notions of what the natural size of a textbox etc should be. This can be fixed by setting a minimum width in the editor specifc section of the widget definition.

Miscellaneous
How do I change my Evoke Password
You can change your Evoke password in the Account area of Evoke.
How do I find out what my Evoke Version number is?
The version number of the instance of Evoke that you are running may be found in the Evoke Context Menu.
Can Multiple developers work on the same App Design in Evoke?
Yes, If you intend to use multiple developers working on the same app design please see the Multiple Users App Design Hierarchy information.