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

[Raj]

Hi,

I understand you are trying to pass an argument from the URL of the app to the app itself.

I’ll suggest few basic steps that will help you in the same-

• The first step is defining the URL structure. In your example, the URL `www.matlabapp.com/app1?dropdownItem=2` includes the `dropdownItem` parameter with a value of `2`.

• In the next step you’ll have to retrieve that argument in your app. In MATLAB, you can use the `webread` function to retrieve the URL and extract the parameter value:

     url = 'http://www.matlabapp.com/app1?dropdownItem=2';
     dropdownItem = webread(url, 'dropdownItem');

• Once you have the value of the `dropdownItem` parameter, you can use it to preselect the corresponding item in your dropdown. In MATLAB, assuming you have a dropdown object named `myDropdown`, you can set the selected item based on the `dropdownItem` value:

      myDropdown.Value = dropdownItem;

I have assumed that your dropdown items are zero-based indexed. If your dropdown items are one-based indexed, you will need to adjust the value accordingly.

Additionally refer to the documentation of ‘webread’ from MathWorks for better understanding

https://www.mathworks.com/help/matlab/ref/webread.html

I hope this resolves your query!

[Ingo Hermann]

And how can I get the url from the actual running WebApp?

I need a command to read the url how the WebApp ist opened.