Prevent typing string in edit text
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I have a problem. I want to create a edit text and then when I type a string in it, it will display nothing like a empty. That is to say it allows only numbers. I found some ways but they use push button for checking. Please help me.
Thank you in advance.
采纳的回答
Jan
2016-3-31
What does "only numbers" exactly mean? "1e3" is a number also.
What about checking the value inside the callback?
function Edit_Callback(hObject, EventData)
Str = get(hObject, 'String');
Value = sscanf(Str, '%g', 1);
fixStr = sprintf('%g', Value);
set(hObject, 'String', 'fixStr);
This tries to interprete the contents as 1 number and removes other characters.
2 个评论
Quan Tran
2016-4-1
Walter Roberson
2016-4-1
You need to define all of the possible number formats, and then you need to write code that parses them. For example do you also allow 8.8E-7 ? 8.8d-7 ? .5e-7 ? 5E+007 ? 8.8+5.2i ? 8.8^-7 (where it is not 10 which is the base being raised) ? 8.8•10^+7 ? 8.8*10^—7 (notice that is one of the dashes, not a minus sign) ? 8.8*10ˆ7 (notice that is ˆ not ^) ？ 8.8·10^-7 ? 8.8×10^-7 ?
更多回答（3 个）
Walter Roberson
2016-3-31
0 个投票
You can use a variation of http://www.mathworks.com/matlabcentral/fileexchange/24861-41-complete-gui-examples/content/GUI_37.m
Daveed Daveed
2022-7-31
Hello. i was walking around here and i thought the following solution might be usefull for future people (may be the past time traveler :) )
function prevent_string(textbox_control)
if textbox_control.String ~= "" && isnan(str2double(textbox_control.String))
textbox_control.String = "";
end
Walter Roberson
2022-7-31
These days you would use a
uieditfield('numeric')
which requires uifigure() (and will not work for traditional figures)
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