I am using ‘appdesigner’, I would like to programmatically scroll to the bottom of a TextArea, is this possible?

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Gregg Swanson
Gregg Swanson 2017-4-28
回答： Eric Sargent 2020-12-9
I am using ‘appdesigner’.
I would like to programmatically scroll to the bottom of a TextArea, is this possible?
My text area is being used a "console log".
Thanks, Gregg

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回答（4 个）

Michael Corbett
Michael Corbett 2018-10-12
To accomplish a scrolling text area, I did the following:
- Create the Text Area with 3 lines high (or as many as you'd like).
- Create a public consoleObj object using
properties (Access = public)
consoleObj
end
- On startup, write lines one and two (change to whatever appropriate):
app.consoleObj.line1 = 'Console Started';
app.consoleObj.line2 = 'System ready';
app.consoleObj.line3 = '';
app.ConsoleTextArea.Value = {app.consoleObj.line1;app.consoleObj.line2;app.consoleObj.line3};
- Wrote a function that would replace line1 with line2, line2 with line3, then add the new line3 and display:
methods (Access = public)
function writeConsoleLine(app,lineIn)
app.consoleObj.line1 = app.consoleObj.line2;
app.consoleObj.line2 = app.consoleObj.line3;
app.consoleObj.line3 = lineIn;
app.ConsoleTextArea.Value = {app.consoleObj.line1;app.consoleObj.line2;app.consoleObj.line3};
end
- Call the function to display the new text.
writeConsoleLine(app,'Pushbutton pressed');
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Jan
Jan 2019-2-14
@Marko: Please use flags only to inform admins and editors about content, which might conflict with the terms of use, like spam or rudeness. Thanks.
If this answer solves your problem, "accept" it instead of setting a flag.
Samuel Salinas
Samuel Salinas 2020-6-12
I tried the same approach but the "app.ConsoleTextArea.Value" field demands a string scalar or charcater vector, not a cell.
How do I go around this?

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Joshua Welsh
Joshua Welsh 2018-4-16

Put your text into a ListBox instead of text area and then use the scroll function:

     scroll(app.ListBox, 'bottom')
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Han Geerligs
Han Geerligs 2017-6-9
Hi Gregg,
I have the same question. Do you have any solution already?
regards, Han
Eric Sargent
Eric Sargent 2020-12-9
As of R2020b uitextarea now supports scroll.
In this case you could use:
scroll(textArea, 'bottom')
https://www.mathworks.com/help/matlab/ref/matlab.ui.container.tree.scroll.html?searchHighlight=scroll%20uitextarea&s_tid=srchtitle

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