How do you get the currently selected <option> in a <select> via JavaScript?

Question

如何通过JavaScript获取当前选择的<select>元素的<option> ？

Answer 1

This will do it for you:

var yourSelect = document.getElementById( "your-select-id" );
alert( yourSelect.options[ yourSelect.selectedIndex ].value )

Answer 2

The .selectedIndex of the select object has an index; you can use that to index into the .options array.

Answer 3

var payeeCountry = document.getElementById( "payeeCountry" );
alert( payeeCountry.options[ yourSelect.selectedIndex ].value );

Answer 4

Using the selectedOptions property:

var yourSelect = document.getElementById("your-select-id");
alert(yourSelect.selectedOptions[0].value);

It works in all browsers except Internet Explorer.