JQUERY 사용할 때
$("#countryselect").val('4')
//OR
$("#countryselect option").val('4').attr("selected", true)
바닐라 JavaScript의 경우
selectOption.setAttribute('selected', true);
//or
selectOption.selected = true;
참고
How to add "selected" in option attribute using Javascript or jQuery?
Below is code for select option and generate using php from database and i try to add selected="selected" to value="4" using jQuery or any javascript:
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