Answer / kevin konkle

//A script to format the Name field to only allow letters
//Have this be called off the keypress event of your
textbox control.
function nameFormat(fld, e)
{
var key = '';

//This string contains all characters you want to allow
//It could just as easily be 0123456789 to only allow
numbers.
var strCheck
= 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
var whichCode = (window.Event) ? e.which : e.keyCode;

if (whichCode == 13) return true; // Enter
if (whichCode == 8) return true; // Delete

// Get key value from key code
key = String.fromCharCode(whichCode);

// Not a valid key
if (strCheck.indexOf(key) == -1) return false;

//If it is a legal value then add it to the text box
fld.value += key;

return false;
}

i am making a purchase sheet in html ,it contain names of product(by selecting checkboxes),quantity(textbox) and price(checbox), by using java script i am restricting the user to prevent them to enter the wrong data ,so i made the servlet were i am only able to prevent them to enter the page in empty field , so my doubt is how do you prevent them how to enter non numerical data in quantity field

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