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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <form>
    <input type="text"><input type="text"><input type="text">
    <input type="submit">
</form>
</body>
</html>
$(function() {
  $("form").on("submit", function(e) {
  
    e.preventDefault();
    
    if (checkInputs($(this))) {
      alert("success");
    }
    else {
      alert("fail");
    }
    
  });
})
​
function checkInputs(form) {
  var inputs, all, 
      status = true;
​
  if (form && form.length) {
    inputs = form.find("input[type=text]");
​
    all = inputs.length;
​
    while (all--) {
      if (!inputs[all].value) {
        status = false;        
​
        break;
      }
    }
​
    return status;
  }
}
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