Dynamically add select option list value depend upon select option value using javascript.
we trigger the callback function using addEventListener when change occurs in main options.
Get the selected value and corresponding value using object property calling method.
using while loop deletes the submenu option if there any previous option present.
later we convert the object property to array and loop through it.
using Option constructor which is developed specifically for option value change.
Javascript have inbuilt Options constructor would help us to create the option HTML element with desire value and inner Text.
after the we have to append the options to Select Element .
In video 5:05 convert is misspelled as conver.
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