bd/mybmi.html at master · zhangsgithub04/bd · GitHub

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<html>

<head>

    <title>BMI Calculator</title>

    <script type="text/javascript">
	// only functions should be put here.
	// if you have global statements, they should be put in
	// a script tag at the end of the body.
	// If you mix functions and global statements in one external js file
	// it should be referenced using a script tag put in the end of the body

        function computeBMI()
        {
            //Obtain user inputs

            var height=document.getElementById("height").value;
            var weight=document.getElementById("weight").value;


            //Convert all units to metric
            height/=39.3700787;
            weight/=2.20462;

            //Perform calculation
            var BMI=weight/Math.pow(height,2);

            //Display result of calculation
            document.getElementById("output").innerHTML=Math.round(BMI*100)/100;

            if (BMI<18.5)
            annotation = "Underweight";
            if (BMI>=18.5 && BMI<=25)
            annotation = "Normal";
            if (BMI>=25 && BMI<=30)
            annotation = "Obese";
            if (BMI>30)
            annotation = "Overweight";

	    // Display annotation
            document.getElementById("comment").innerHTML = annotation;

            document.getElementById("test").innerHTML = "You are" + height +"meters";

        }

    </script>

</head>

<style>

button, body{

background-color: white;
font-size:20pt;
}

</style>

<body>

<a href="http://www.whathealth.com/bmi/formula.html"> Click here for formula
</a>

    <div>Body Mass Index Calculator</div>

    <div>Enter your height in inches: <input type="text" id="height"/>
    </div>

    <div>Enter your weight in pounds: <input type="text" id="weight"/>
    </div>

    <div>
	<button onclick="computeBMI();"> ComputeBMI obtrusive</button> <!-- this is obtrusive -->

	<button id="b1";"> ComputeBMI unobtrusive </button>  <!-- this is unobtrusive, see below javascript-->
    </div>

    <div> Your BMI is: <span id="output">?</span> </div>

    <div> Your are: <span id="comment">?</span> </div>
    <div> Testing  <span id="test">?</span> </div>

	<script type="text/javascript">
	// only functions should be put here.
	// if you have global statements, they should be put in
	// a script tag at the end of the body.
	// If you mix functions and global statements in one external js file
	// it should be referenced using a script tag put in the end of the body

	var b = document.getElementById('b1');
	b.onclick = function() {
    		alert('Hello Hartwick');
		computeBMI();
	}
	</script>
</body>
</html>