Allow only numbers to be typed in a textbox

Question

How to allow only numbers to be written in this textbox     lt input type  text  class  textfield  value    id  extra7  name  extra7  gt

User · Answer

You also can use some HTML5 attributes  some browsers might already take advantage of them  type  number  min  0     Whatever you do  remember to re-check your inputs on the server side  you can never assume the client-side validation has been performed

User · Answer

With HTML5 you can do   lt input type  number  gt    You can also use a regex pattern to limit the input text    lt input type  text  pattern    0-9       gt

User · Answer

You could subscribe for the onkeypress event    lt input type  text  class  textfield  value    id  extra7  name  extra7  onkeypress  return isNumber event     gt    and then define the isNumber function   function isNumber evt        evt    evt    evt   window event      var charCode    evt which    evt which   evt keyCode      if  charCode  gt  31  amp  amp   charCode  lt  48    charCode  gt  57             return false            return true      You can see it in action here

[javascript] Allow only numbers to be typed in a textbox

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