Unable to retrieve the HTML select value in the AJAX response

Question

Unable to retrieve the HTML select value in the AJAX response

In the process of my code, there are two main steps. The first step involves a user filling in certain fields and then submitting the data to the server using ajax. Once submitted, the server returns an HTML select input that requires the user to choose a value - this marks the second step of the process.

However, I am facing an issue where, when attempting to retrieve the selected value from the select element using JavaScript, it returns null.

The code snippet that I am using to extract the select value works perfectly fine under normal circumstances. It is only when the select element is retrieved via ajax that this problem arises.

Here is the code snippet used to get the select value:


var e = document.getElementById("ordernum");
var num = e.options[e.selectedIndex].value;

javascript ajax

Answer 1

Answer №1

Below is a sample HTML code snippet that demonstrates how to dynamically create a select element and retrieve its value using the onchange event:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script>
            const DifficultyLevels = {
                EASY:1,
                MEDIUM:2,
                HARD:3,
                INSANE:4
            };

            function initialize(event) {
                console.log(event);
                var pageBody = document.getElementById('body');
                var selectElement = document.createElement('select');
                selectElement.id = 'selDifficulty';
                for (var level in DifficultyLevels) {
                    var optionElement = document.createElement('option');
                    optionElement.value = DifficultyLevels[level];
                    optionElement.innerHTML = level;
                    selectElement.appendChild(optionElement);
                }

                selectElement.onchange = updateSelection;

                pageBody.appendChild(selectElement);
                console.log(pageBody);
            }

            function updateSelection(event) {
                console.log(event.target.value);
            }

            window.onload = initialize;
        </script>
    </head>
    <body id="body">
    </body>
</html>

Answer 2

Below is a sample HTML code snippet that demonstrates how to dynamically create a select element and retrieve its value using the onchange event:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script>
            const DifficultyLevels = {
                EASY:1,
                MEDIUM:2,
                HARD:3,
                INSANE:4
            };

            function initialize(event) {
                console.log(event);
                var pageBody = document.getElementById('body');
                var selectElement = document.createElement('select');
                selectElement.id = 'selDifficulty';
                for (var level in DifficultyLevels) {
                    var optionElement = document.createElement('option');
                    optionElement.value = DifficultyLevels[level];
                    optionElement.innerHTML = level;
                    selectElement.appendChild(optionElement);
                }

                selectElement.onchange = updateSelection;

                pageBody.appendChild(selectElement);
                console.log(pageBody);
            }

            function updateSelection(event) {
                console.log(event.target.value);
            }

            window.onload = initialize;
        </script>
    </head>
    <body id="body">
    </body>
</html>

Unable to retrieve the HTML select value in the AJAX response

Answer №1

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