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<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title> JavaScript DOM getElementsByName() Method </title> 
</head>
<body>
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Samsung:  <input name="Smartphone" type="checkbox" value="Samsung">
OnePlus:  <input name="Smartphone" type="checkbox" value="OnePlus">
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<p>Click the button to check all checkboxes that have a name attribute with the value "Smartphone".</p>
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<button onclick="myFunction()">Try it</button>
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<script>
 function myFunction() {
  var x = document.getElementsByName("Smartphone");
  var i;
  for (i = 0; i < x.length; i++) {
    if (x[i].type == "checkbox") {
      x[i].checked = true;
    }
  }
}
</script>  
</body>
</html>   
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