Web app with input parameter as a url argument

How can I pass an argument from the url of the app to the app? Say for example the app is a dropdown with 3 items. The url is www.matlabapp.com/app1. if I type www.matlabapp.com/app1?dropdownItem=2 in the browser, it should automatically preselect the 2nd item from the drop down.

Answer 1

[Dev]

Hi @Rachid Rezgui,

The question mentions a Web app, so I am assuming that you have a MATLAB App here, which is most likely a MATLAB Web App deployed using the "MATLAB Web App Server". Our aim is to accept URL query parameters and use them inside the app, such as to preselect a dropdown item.

"MATLAB Web App Server" provides access to URL query parameters using the "getWebAppServerData" function inside your app. I have mentioned a minimal working step-by-step example below which helps us achieve the dropdown functionality-

• Create a simple app with a dropdown in "MATLAB App Designer":

Add a "uidropdown" component.

In the startupFcn of the app, read the query parameter.

• Code the functionality of the startupFcn in the in "App Designer". We use the "getWebAppServerData" function here to get the query parameters from the URL.
• Deploy the app to "MATLAB Web App Server" and access it with a query parameter.

For more information on the usage of the tools and functions mentioned above, please refer to the documentation links below-

"MATLAB Web App Server"- https://www.mathworks.com/products/matlab-web-app-server.html

"MATLAB App Designer"- https://www.mathworks.com/products/matlab/app-designer.html

"uidropdown"- https://www.mathworks.com/help/matlab/ref/uidropdown.html

I hope the above information helps to solve the query.

[Rachid Rezgui]

Hello, yes I am using exactly that bit i can not find the getWebAppServerData function anywhere. Not even in the docuementation. All I need is the query from the link that i can use to preload the app when the startup function is triggered.