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I have a dropdown list in which I select how many people are going to a party. When the user changes the value of the dropdown list, I want as many fields as the number selected to appear and hide the rest.
But I don’t know how can I hide or delete fields because I don’t know their index.
Yes you will need to have the fields you want to hide as a global variables.
You will also need to get the value the user has selected and use that to work out what fields should be removed or added.
One way would be to add all the fields in order to a vector or an array when the screen is initialised. Once the user has selected a value you could iterate through the fields and use the current index of the list and the user selected value to work out if the field should be removed or added.