Homework SourseUsing JavaScript write a boolean method that returns true if
Solution
<html>
<head>
<script>
var variable_name = 1;
alert(getBoolean());
function getBoolean()
{
if (typeof variable_name != \'undefined\')return true;
else return false;
}
</script>
</head>
<body>
</body>
</html>
In order to search for a HTML element on page, following options can be used.
For example, to check whether a <div> with id=\"abc\" is rendered by the browser or not, following script can be used.
<html>
<head>
</head>
<body>
<div id=\"abc\"></div>
<script>
function getBoolean(arg)
{
if (document.getElementById(arg) !=null)
alert(\'it exists!\');
if (document.getElementById(arg) ==null)
alert(\'does not exist!\');
}
getBoolean(\"abc\");
</script>
</body>
</html>
