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How to allow user to enter only the letters, no numbers and other characters

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By User



I want to implement TexBox where user can input only letters. When user enter numbers or invalid characters, near TextBox must appear Error message. Like this:





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  1. Tips For AllJanuary 31, 2012 at 2:51 AM

    You can use Character.isLetter(char) on TextBox's KeyUpHandler:

    textBox.addKeyUpHandler(new KeyUpHandler() {
    public void onKeyUp(KeyUpEvent event) {
    if (!Character.isLetter(event.getNativeKeyCode())) {
    ((TextBox)event.getSource()).cancelKey();
    customPopup.showRelativeTo(textBox);// your styled PopupPanel
    }
    }
    });


    But, Character.isLetter(char) works with ASCII, if you want more see you can do it something like that:

    /**
    * A better implementation of isLetter -- the default GWT version doesn't support non-English characters.
    *
    * @param c the character to check
    * @return whether the character represents and alphabetic symbol.
    */
    public static boolean isLetter(char c) {
    int val = (int) c;

    return inRange(val, 65, 90) || inRange(val, 97, 122) || inRange(val, 192, 687) || inRange(val, 900, 1159) ||
    inRange(val, 1162, 1315) || inRange(val, 1329, 1366) || inRange(val, 1377, 1415) || inRange(val, 1425, 1610);
    }

    /**
    * Checks if an int value is in a range.
    * @param value value to check
    * @param min min value
    * @param max max value
    * @return whether value is in the range, inclusively.
    */
    public static boolean inRange(int value, int min, int max) {
    return (value <= max) & (value >= min);
    }


    See this: http://code.google.com/p/google-web-toolkit/issues/detail?id=1983

    ReplyDelete
  2. Tips For AllJanuary 31, 2012 at 2:51 AM

    You can write some validation code on keyTyped event to check, what was the last letter typed. Was it a number or not. If not then show error message.

    Try considering KeyLister method : keyTyped()

    ReplyDelete
  3. Tips For AllJanuary 31, 2012 at 2:51 AM

    You may add regex to do this

    ReplyDelete
  4. Tips For AllJanuary 31, 2012 at 2:51 AM

    Javascript to allow Alphabetical characters

    function AllowAlphabet(e)
    {

    keyEntry = !isIE ? e.which : event.keyCode;
    if (((keyEntry >= '65') && (keyEntry <= '90')) || ((keyEntry >= '97') && (keyEntry <=
    '122')) || (keyEntry == '46') || (keyEntry == '32') || keyEntry == '45')
    return true;
    }

    ReplyDelete

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