error in printing the variable in javascript

Question

error in printing the variable in javascript

320 Views Asked by Steven John At 06 November 2025 at 08:48

When I'm running this code it is not showing me the message which I want to display (i.e: res).Suppose I'm giving an input "$code$".Can anyone just help me out?

<!DOCTYPE HTML>
<html>
<head>

</head>
<body>
    <h1>Enter a sample message</h1>
    <form>
        <input type="text" name="a" id="a">
        <button onclick="parse()">submit</button>
        <p id="a"></p>
    </form>
    <script>
        function parse(){
            var msg=document.getElementById("a").innerHTML;
            var res=msg.replace("$code$","1101"); 
            document.getElementById("a").innerHTML=res;//this is to print res.

        }
    </script>
</body>
</html>

Original Q&A

There are 2 best solutions below

Paulos Ab On 10 October 2020 at 20:23

Check this:

<form>
    <input type="text" name="a" class="input_field" id="a">
    <button type="button" onclick="parse()">submit</button>
    <p id="a"></p>
</form>
<script>
    function parse(){
        var msg=document.getElementById("a").innerHTML;
        var form = document.getElementsByTagName("form")[0]
        msg = form.getElementsByClassName("input_field")[0].value;//this is to print res.

    }
</script>

I added type="button" to the button to prevent the form from reloading the page

**nvkrj** · Accepted Answer

Two elements can't have the same ID. Further, an input element's value can not be obtained using the innerHTML property. Also, on clicking the submit button, the page will reload since the form get's submitted. To prevent that, call the function parse in an onsubmit on the <form> tag, and return false from the function.

<!DOCTYPE HTML>
<html>
<head>

</head>
<body>
    <h1>Enter a sample message</h1>
    <form onsubmit="return parse();">
        <input type="text" name="a" id="a">
        <button type="submit">submit</button>
        <p id="b"></p>
    </form>
    <script>
        function parse(){
            var msg = document.getElementById("a").value;
            document.getElementById("b").innerHTML = msg;
            return false;
        }
    </script>
</body>
</html>

error in printing the variable in javascript

There are 2 best solutions below

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