how do you unselect all items from a listbox using jquery

Question

有没有办法使用 jquery 取消选择列表框的所有项目而不遍历每个项目？

Answer 1

The shortest way is this method:

$("#myListBox").val([]);

This sets the value to an empty array, meaning select no values. .val() takes an array in the case of a <select multiple> element. Note that $("select").val('');​​​​​​​ also works here :)

Answer 2

jQuery 旨在同时处理多个元素：

$(listboxSelector).find("option").attr("selected", false);

Answer 3

$('#myListbox option').attr('selected',false);

Answer 4

$("#mylistbox").options.attr("selected", false);