防止用户在javascript小数点前输入3个以上的数字

Question

In PHP textfield: Prevent the user from entering more then 3 numbers before decimal point for example:

if user enter 123.12 its acceptable, if user enter 12.12 its also acceptable, but if user enter 1234.12 its not acceptable.

Just check this fiddle: http://jsfiddle.net/S6uky/

---

HTML:

<form method="post">
    <div class="row">
        <label>Val 1</label>
        <input type="text" class="validate" name="val1" maxlength="5"/>
    </div>
    <div class="row">
        <label>Val 2</label>
        <input type="text" class="validate" name="val2" maxlength="5" />
    </div>
    <div class="row">
        <label>Val 3</label>
        <input type="text" class="validate" name="val3" maxlength="5" />
    </div>
    <div class="row">
        <button type="submit">Send</button>
    </div>
</form>

---

JAVA SCRIPT:

$(function(){
  $('.validate').blur(function(){
      var reg=/^[0-9]{1}[0-9]{1}[\.]{1}[0-9]{1}[0-9]{1}$/g;
      if($(this).val().match(reg)==null)
            alert('Invalid input!');
                                          });});

Answer 1

function isAccept(number){
  return number.indexOf('.') < 4;
}