How to allow only the input of numeric data to uitable and text box?
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Good morning. I have the following problem I have a uitable in main GUI that has "n" rows (the rows depend on the value that the user enters in a text box) and 10 columns. I require a code (something like a keypresskeypress event) that allows me to evaluate and discard the entered data that are not numeric both in the uitable and in some text boxes that I have in the main GUI. I do not know much about event management in MATLAB and I'm having a lot of problems with this. My uitable is called ("TablaDatosElementos") and the text box that allows creating the number of rows is called ("NumElem") Thank you very much and I hope you can help me.
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Walter Roberson
2019-6-12
Edit boxes (uicontrol):
You need to set a KeyPressFcn callback.
The first time KeyPressFcn fires after the control gets focus, you can reliably retrieve the String property to find out what is already there.
After that, the String property will not be updated until the control loses focus or the user presses enter, so you need to keep track of every character yourself, keeping an internal buffer of what you have seen and what the current state is. You can update the String property yourself, but it will still read back what it had when the control gained focus, but your changes will affect what is retrieved once focus loss / enter pressed.
With KeyPressFcn in place, the uicontrol will not handle backspace / delete itself: you will need to recognize the characters and adjust your internal buffer accordingly. Most people who do this do not bother to recognize the cursor keys to support positioning within the input.
You will need to keep track of the state: + and - only permitted as the first character, period only accepted once, must have at least one digit before or after the period or on both sides of the period, but period by itself is not valid.
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Walter Roberson
2019-6-12
The link that I gave earlier is to documentation by the person who literally wrote the book on using Java with matlab.
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