JavaScript/farenheit.html at master · Jeevan121/JavaScript · GitHub

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<html>
<head>
<script>

//find celsius from fahrenheit javascript function
//by tutorialsmade.com

functionfindCelsius(){
varfahrenheit=document.getElementById("Fahrenheit").value;
varcelsius;
if(fahrenheit!=''){
celsius=(fahrenheit-32)*5/9;
document.getElementById("output").innerHTML=celsius;
}else{
document.getElementById("output").innerHTML="Please enter a value!";
}
}

//this is just to make sure if the user enter number or not, not actually needed for this program
//this function will allow only numbers to be entered in the textbox
functionallowOnlyNumbers(evt){
evt=(evt) ? evt : window.event;
varcharCode=(evt.which) ? evt.which : evt.keyCode;
if(charCode>31&&(charCode<48||charCode>57)){
returnfalse;
}
returntrue;
}

</script>
</head>
<body>
<h2>Enter Fahrenheit</h2>
<inputtype="text" id="Fahrenheit" onkeypress="return allowOnlyNumbers()" />
<strong>Fahrenheit</strong>

<h4>Output: <spanid="output"></span></h4>
</body>
</html>