Preventing user to enter chars in a JTextField
Hello,
I'm working on a small "calculator" applet. I'm pretty much done, except for a couple of problems:
First I would like to prevent the users to enter non-numeric characters in the JTextField where the numbers go, but I have no idea how to go about that.
The other thing is that all my JButtons don't show their set text (like +,-,/ , etc) instead they all show "..." , as if the text was too big for the button. I can get the text to show if I enlarge the buttons enough, but I end up with insanely large buttons, and the text is in reality quite small. Any way to decrease the size of the text inside the button? (i'm using setBounds() for positions and sizes by the way).
Hello,
I'm working on a small "calculator" applet. I'm
pretty much done, except for a couple of problems:
First I would like to prevent the users to enter
non-numeric characters in the JTextField where the
numbers go, but I have no idea how to go about that.See JFormattedTextField and MaskFormat in the JavaDocs.
>
The other thing is that all my JButtons don't show
their set text (like +,-,/ , etc) instead they all
show "..." , as if the text was too big for the
button. I can get the text to show if I enlarge the
buttons enough, but I end up with insanely large
buttons, and the text is in reality quite small. Any
way to decrease the size of the text inside the
button? (i'm using setBounds() for positions and
sizes by the way).Don't. Use a LayoutManager. For a calculator, a group of nested GridLayout Panels should work.
Jim S.
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you can refer following example
========= formula ===============
Initialise Variables which can be null
default for db_pre_period_start is ' '
default for db_pre_period_end is ' '
default for db_post_period_start is ' '
default for db_post_period_end is ' '
default for db_ref_period_start is ' '
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Requirement:
How can I prevent guest users from entering '+' sign or '0' in front of country-code in the visitor phone number field during self registration?
Few SMS service providers are not looking for '+' sign or '0' or '00' in front of the international phone numbers to trigger the sms. Providing these values in front of country code during self-registration may fail to deliver the sms to recipient.
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Using a simple regular expression, you can validate the entered phone number during the guest registration.
The below regular expression will help you to validate the phone number and allows to register only when the phone number is not staring with '+' or '0'.
^[1-9][0-9](\d{7}|\d{8}|\d{9}|\d{10}|\d{11}|\d{12})$
It also performs the below validations.
only numbers are allowed.
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numbers from 0 to 9 are allowed from the second digit.
also validates phone number length, the length of the phone number should be 9 to 14.
Configuration:
To add the above regex in the visitor_phone number filed, please navigate to ClearPass Guest >> Configuration >> (Pages)Guest Self-Registration >> select the self-registration page and go to Edit >> Register Page >> Form >> select the filed visitor_phone and set the Validator to " ISRegexMatch" and enter the above regex in the Validator Argument filed as shown below.
Note: Edit the Validation Error as per your requirement.
Verification
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Result when phone number starts with '+' or '0'.
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How do you prevent a user from entering characters like A or B into a field that is defined as a numeric field?
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how can we prevent a user from entering a value in Parameter Field and Select-options Field?
make it invisible, make it inactive, make it display only.
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hi,
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import javax.swing.JTextField;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
public class MaskedTextField extends JTextField
private String initStr;
public MaskedTextField (String mask, String initStr)
super();
setDocument(new MaskedDocument(initStr, mask, this));
setText(initStr);
this.initStr = initStr;
this.addMouseListener(new java.awt.event.MouseAdapter()
public void mouseClicked(MouseEvent m)
this_mouseClicked(m);
private void this_mouseClicked(MouseEvent m)
if (getText().equals(initStr)) setCaretPosition(0);
class MaskedDocument extends PlainDocument
String mask;
String initStr;
JTextField tf;
public MaskedDocument(String initStr, String mask,
MaskedTextField container)
this.mask = mask;
this.initStr = initStr;
tf = container;
void replace(int offset, char ch, AttributeSet a)
throws BadLocationException
super.remove(offset,1);
if (capitalised) super.insertString(offset,
String.valueOf(ch).toUpperCase(),a);
else super.insertString(offset, "" + ch, a);
public void remove(int offs, int len) throws BadLocationException
if (len==0)
return;
// Remove current contents
super.remove(offs, len);
// Replace the removed part by init string
super.insertString(offs,initStr.substring(offs,offs+len),
getAttributeContext().getEmptySet());
tf.setCaretPosition(offs);
public void insertString(int offset, String str, AttributeSet a)
throws BadLocationException
if ((offset==0) && str.equals(initStr))
// Initialisation of text field
super.insertString(offset,str,a);
return;
if (str.length()==0)
super.insertString(offset,str,a);
return;
for (int i=0;i<str.length();i++)
while ((offset+i) < mask.length())
if (mask.charAt(offset+i)=='-')
// Skip fixed parts
offset++;
else
// Check if character is allowed according to mask
if (str.charAt(i) != this.initStr.charAt(i))
switch (mask.charAt(offset+i))
case 'D': // Only digitis allowed
if (!Character.isDigit(str.charAt(i)))
return;
break;
case 'C': // Only alphabetic characters allowed
if (!Character.isLetter(str.charAt(i)))
return;
break;
case 'A': // Only letters or digits characters allowed
if (!Character.isLetterOrDigit(str.charAt(i)))
return;
break;
replace(offset+i, str.charAt(i),a);
break;
else
i++;
offset--;
// Skip over "fixed" characters
offset += str.length();
while ((offset<mask.length()) && (mask.charAt(offset)=='-'))
offset++;
if (offset<mask.length())
tf.setCaretPosition(offset);
if (offset == mask.length()) tf.setCaretPosition(offset);
Enjoy
Bernie -
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I have a sharepoint 2010 list that I need to prevent users to edit from the datasheet view. This is because I have edited the add item form on sharepoint designer and included some custom code. Moreover, I need to allow the users to view the list in datasheet
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GeorgeHi.
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You could also check:
http://support.microsoft.com/kb/2274841
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hr class="sig">Thomas Balkeståhl - Technical Specialist - SharePoint -
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