DropDown binding issue in asp .net

Question

I am trying to append the values to dropdown using below line of javascript code the values that i get in the option are correct but the issue is with the code in my aspx page ddlCountries.appendChild(option); Below is my aspx code

Naimish Makwana · Answer

Try below code: // Get a reference to the dropdown element var dropdown = document.getElementById(' '); // Create a new option element var option = document.createElement('option'); option.value = 'value1'; // Set the value of the option option.text = 'Option 1'; // Set the text of the option // Append the option to the dropdown dropdown.appendChild(option); Thanks

avair · Answer

this append child is at the end of the function only

Amit Mohanty · Answer

The error message Uncaught TypeError: Cannot read properties of null (reading 'appendChild') indicates that the ddlCountries element is null. Make sure the JavaScript code is executed after the ddlCountries dropdown is rendered on the page. Placing the JavaScript code at the end of the page can help ensure that the dropdown element exists before accessing it.

avair · Answer

getting error as Uncaught TypeError: Cannot read properties of null (reading 'appendChild')

Amit Mohanty · Answer

try this once: var ddlCountries = document.getElementById(' '); var option = document.createElement(option); option.text = Option Text; option.value = Option Value; ddlCountries.appendChild(option);

avair · Answer

Tried this as well but it's not working its ext gridview