validate for only allow numeric and dot by using javascript

Question

validate for only allow numeric and dot by using javascript in asp.Net

Jaganathan Bantheswaran · Answer

Hi Working example with RegEx http://jsfiddle.net/9H4Nc/4/

Sanjeeb Lenka · Answer

hi try this sample: function fun_AllowOnlyAmountAndDot(txt) { if (event.keyCode > 47 && event.keyCode var txtbx = document.getElementById(txt); var amount = document.getElementById(txt).value; var present = 0; var count = 0; if (amount.indexOf(. present) || amount.indexOf(. present + 1)); { // alert('0'); } /*if(amount.length==2) { if(event.keyCode != 46) return false; }*/ do { present = amount.indexOf(. present); if (present != -1) { count++; present++; } } while (present != -1); if (present == -1 && amount.length == 0 && event.keyCode == 46) { event.keyCode = 0; //alert(Wrong position of decimal point not allowed !!); return false; } if (count >= 1 && event.keyCode == 46) { event.keyCode = 0; //alert(Only one decimal point is allowed !!); return false; } if (count == 1) { var lastdigits = amount.substring(amount.indexOf(.) + 1 amount.length); if (lastdigits.length >= 2) { //alert(Two decimal places only allowed); event.keyCode = 0; return false; } } return true; } else { event.keyCode = 0; //alert(Only Numbers with dot allowed !!); return false; } }