JavaScriptPractice/error.html at main · EduKeyPath/JavaScriptPractice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
</head>
<body>
<p id="demo"></p>

<input type="text" value="" id="fld" />
<button onclick="btn()">Click</button>
<p id="demo2"></p>

<p id="demo3"></p>

<script>
    try {
        adddalert('Hello');
    }
    catch(test) {
        document.getElementById('demo').innerHTML = test.message;
    }


    function btn(){
        var txV = document.getElementById('fld').value;
        try {
            if(txV == '') throw 'Fill the text box';
            if(isNaN(txV)) throw 'not a number';
            if(txV > 20) throw 'give low number';
            if(txV < 5) throw 'give high number';
        }
        catch(errMsg) {
            document.getElementById('demo2').innerHTML = errMsg;
        }
        finally {
            document.getElementById('fld').value = '';
        }

    }


    /*function btn(){
        var fldV = document.getElementById('fld').value;
        try {
            if(fldV == '') throw 'Fill text';
            if(isNaN(fldV)) throw 'not number';
            fldV = Number(fldV);
            if(fldV < 5) throw 'too low';
            if(fldV > 15) throw 'too high';
        }
        catch (err){
            document.getElementById('demo2').innerHTML = err;
        }
    }*/

</script>


</body>
</html>