Posted By

blackf0rk on 03/12/09


Tagged

javascript numbers only limit


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Limit text input to numbers (with or without decimals)


 / Published in: JavaScript
 

URL: http://codefinds.blogspot.com/2007/10/limit-text-input-to-numbers-javascript.html

  1. // Limit the text field to only numbers (with decimals)
  2. function format(input){
  3. var num = input.value.replace(/\,/g,'');
  4. if(!isNaN(num)){
  5. if(num.indexOf('.') > -1){
  6. num = num.split('.');
  7. num[0] = num[0].toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'');
  8. if(num[1].length > 2){
  9. alert('You may only enter two decimals!');
  10. num[1] = num[1].substring(0,num[1].length-1);
  11. } input.value = num[0]+'.'+num[1];
  12. } else {
  13. input.value = num.toString().split('').reverse().join('').replace(/(?=\d*\.?)(\d{3})/g,'$1,').split('').reverse().join('').replace(/^[\,]/,'') };
  14. } else {
  15. alert('You may enter only numbers in this field!');
  16. input.value = input.value.substring(0,input.value.length-1);
  17. }
  18. }
  19.  
  20. // Limit the text field to only numbers (no decimals)
  21.  
  22. function formatInt(input){
  23. var num = input.value.replace(/\,/g,'');
  24. if(!isNaN(num)){
  25. if(num.indexOf('.') > -1) {
  26. alert("You may not enter any decimals.");
  27. input.value = input.value.substring(0,input.value.length-1);
  28. }
  29. } else {
  30. alert('You may enter only numbers in this field!');
  31. input.value = input.value.substring(0,input.value.length-1);
  32. }
  33. }
  34.  
  35.  
  36. //utilization
  37. <input id="text" name="text" size="5" onkeyup="format(this);">

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