Form validation dynamic created element not working

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I have some fields (created dynamically) in a page and I am trying to each element on form submit .Bellow code is sample ,only txtAge field validate, txtName not validating .Is there any option to validate each field with bellow code?

What I have tried:

HTML

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script>
        function txtName_FormValidation() {
            document.getElementById('entryForm').onsubmit = function (e) {
                if (document.getElementById('txtName').value.length <= 0) {
                    alert(1)
                    document.getElementById('span_txtName').innerHTML = 'Please Enter Name.'
                    return false;
                };
            }
        }
        function txtAge_FormValidation() {
            document.getElementById('entryForm').onsubmit = function (e) {
                if (document.getElementById('txtAge').value.length <= 0) {
                    alert(2)
                    document.getElementById('span_txtAge').innerHTML = 'Please Enter Age.'
                    return false;
                };
            }
        }
    </script>
</head>
<body onload="txtName_FormValidation(); txtAge_FormValidation()">
    <form id="entryForm">
        <input type="text" id="txtName" />
        <span id="span_txtName"></span>
        <br />
        <input type="text" id="txtAge" />
        <span id="span_txtAge"></span>
        <br />
        <button type="submit" value="Sebmit">Submit</button>
    </form>
</body>
</html>

Posted 27-Apr-17 6:31am

KuntalBose

Updated 27-Apr-17 6:52am

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Karthik_Mahalingam · Answer 1 · 2017-04-27T06:52:00

try

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script>
        function formValidation() {
            document.getElementById('entryForm').onsubmit = function (e) {
                debugger
                var span_txtName = document.getElementById('span_txtName');
                var span_txtAge = document.getElementById('span_txtAge');
                span_txtName.innerHTML = ''
                span_txtAge.innerHTML = ''

                var isValid = true;
                if (document.getElementById('txtName').value.length == 0) {
                    span_txtName.innerHTML = 'Please Enter Name.'
                    isValid = false;
                }
                if (document.getElementById('txtAge').value.length == 0) {
                    span_txtAge.innerHTML = 'Please Enter Age.'
                    isValid = false;
                };
                return isValid;
            }
        }
    </script>
</head>
<body onload="formValidation()">
    <form id="entryForm">
        <input type="text" id="txtName" />
        <span id="span_txtName"></span>
        <br />
        <input type="text" id="txtAge" />
        <span id="span_txtAge"></span>
        <br />
        <button type="submit" value="Sebmit">Submit</button>
    </form>
</body>
</html>