JavaScript meaning
JavaScript can change the HTML attributes.
JavaScript can change the HTML styles (CSS)
Example for CSS:
JavaScript can change the HTML styles (CSS)
Example for CSS:
<!DOCTYPE html>
<html>
<body>
<h1>What Can JavaScript Do?</h1>
<p id="demo">JavaScript can change the style
of an HTML element.</p>
<button type="button"
onclick="myFunction()">Click Me!</button>
<script>
function myFunction() {
var x =
document.getElementById("demo");
x.style.fontSize =
"25px";
x.style.color =
"red";
}
</script>
</body>
</html>
JavaScript can validate data.
JavaScript is often used to validate input.
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Can Validate Input</h1>
<p>Please input a number between 1 and 10:</p>
<input id="numb">
<button type="button"
onclick="myFunction()">Submit</button>
<p id="demo"></p>
<script>
function myFunction() {
var x, text;
// Get the value
of the input field with id="numb"
x =
document.getElementById("numb").value;
// If x is Not a
Number or less than one or greater than 10
if (isNaN(x) || x
< 1 || x > 10) {
text =
"Input not valid";
} else {
text =
"Input OK";
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
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