Javascript script to check if number is triangle number.

// © 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

<html>
<body>
    Enter a number:  <input type="text" id="data">
    <button onclick="check()">Convert</button>
    <p id="newText"></p>

    <script>
        function check(){
            var data = document.getElementById("data").value;
            var n = parseInt(data);
            
            if(isSquare(8 * n + 1)){
                document.getElementById("newText").innerHTML = "Number is triangle number";     
            } else {
                document.getElementById("newText").innerHTML = "Number is not triangle number";
            }
        }

        function isSquare(n)
        {
            for (var i = 0; i < n / 2 + 2; i++)
            {
                if (i * i == n)
                {
                    return true;
                }
            }

            return false;
        }
    </script>
</body>
</html>

 



Javascript Check If Number Is Triangle Number
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