diff --git a/_posts/2016-04-26-javascript-validator-for-input-number.markdown b/_posts/2016-04-26-javascript-validator-for-input-number.markdown
index 0c04c16..f7c7a14 100644
--- a/_posts/2016-04-26-javascript-validator-for-input-number.markdown
+++ b/_posts/2016-04-26-javascript-validator-for-input-number.markdown
@@ -8,4 +8,23 @@ categories: [others]
 This javascript will validate/allow the number only when event key is pressed.
 For example result of it:
 
-<iframe width="100%" height="350" src="//jsfiddle.net/agaust/3qz105nn/embedded/html,result/dark/" allowfullscreen="allowfullscreen" frameborder="0"></iframe>
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+<iframe width="100%" height="350" src="//jsfiddle.net/agaust/3qz105nn/embedded/html,result/dark/" allowfullscreen="allowfullscreen" frameborder="0"></iframe>
+
+tutorial above, when you can not directly add the attribute inside html tag.
+but if you can add it, you can following this bellow:
+
+{% highlight html %}
+<input id="id_price" type="number" min=0 onkeypress="return isNumber(event)"/>
+<script type="text/javascript">
+function isNumber(evt) {
+    evt = (evt) ? evt : window.event;
+    var charCode = (evt.which) ? evt.which : evt.keyCode;
+    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
+        return false;
+    }
+    return true;
+}
+</script>
+{% endhighlight %}
+
+hope it usefull.
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