How to accept only numbers in a edit text box?

Question

Nu9 2011-8-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/14581-how-to-accept-only-numbers-in-a-edit-text-box

评论： Walter Roberson 2017-12-18

hi again, i need to input values at seven edit text box but i want to show a window withe erros alert when i input leters. using guide and callback functions it's easy but now i have this at the script:

Temp = uicontrol('style','edit',...
            'units','pixels',...
            'position',[25 364 101 31],...
            'string','Inserir Temperatura.',...
            'foregroundcolor','r',...
            'callback',{@Temp_call});
pause(2)
S = get(0,'userdata');
str = '0';
set(Temp,'string',str,'foregroundcolor','k')
uicontrol(Temp)
function [] = Temp_call(varargin)
% Callback for secondary GUI editbox.
S = get(0,'userdata');
set(S.ed,'string',get(gcbo,'string'))  % Set gui_passdata editbox string.

and with guide when i've done another project, i use this code:

input = str2num(get(hObject,'String'));
if (isempty(input))
     set(hObject,'String','0')
end
guidata(hObject, handles);

can i use this code? i don't know how to use because there's no handles

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Fangjun Jiang 2011-8-26

5
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/14581-how-to-accept-only-numbers-in-a-edit-text-box#answer_19813

在 MATLAB Online 中打开

Temp = uicontrol('style','edit',...
            'units','pixels',...
            'position',[25 364 101 31],...
            'string','Inserir Temperatura.',...
            'foregroundcolor','r',...
            'callback','@Temp_call');
function Temp_call(src,eventdata)
str=get(src,'String');
if isempty(str2num(str))
    set(src,'string','0');
    warndlg('Input must be numerical');
end

2 个评论
显示无隐藏无

Jose Antonio Salcedo Simon 2017-12-18

编辑：Walter Roberson 2017-12-18

在 MATLAB Online 中打开

Hi Fangjun,

I'm a little new, could you give me a more detailed example?

I have this code:

caja_lonsat= uicontrol('style','edit','Units','normalized','pos',tex(29,:),...
                               'ForegroundColor','black','String',num2str(lonsat,'%4.2f'),...
                               'Horizontalalignment','left',...
                               'Backgroundcolor','white','Fontsize',12);

What else do I need? Thanks so much.

Walter Roberson 2017-12-18

在 MATLAB Online 中打开

caja_lonsat= uicontrol('style', 'edit', 'Units', 'normalized', 'pos', tex(29,:), ...
  'ForegroundColor', 'black', 'String', num2str(lonsat,'%4.2f'), ...
  'Horizontalalignment', 'left', ...
  'Backgroundcolor', 'white', 'Fontsize', 12, ...
  'Callback', @temp_call);

Along with

function Temp_call(src,eventdata)
  str = get(src, 'String');
  if isnan(str2double(str))
      set(src, 'String',' 0');
      warndlg('Input must be numerical');
  end