javascript tutorial Insert Unique Values into combo box dropdown list

#javascript

javascript tutorial Insert Unique Values into combo box dropdown list

To insert unique values into a combo box dropdown list in JavaScript, follow these steps:

1. Create an empty array to store unique values.
2. Iterate through your data source (e.g., an array or database) and for each item, check if it's already in the unique values array.
3. If the item is not in the unique values array, add it.
4. Once you have collected all unique values, create an HTML select element (combo box).
5. Loop through the unique values array and create an option element for each unique value, then append it to the select element.
6. Finally, add the select element to your HTML document.

This process ensures that the combo box contains only unique values from your data source. It's an essential technique for presenting distinct options to users in a dropdown list without duplicates.