JQuery's large set of Select operations (favorites)

1. jQuery adds/deletes Select Option items:
2. $ ("# select_id"). append ("<option value = 'value'> Text </option>"); // append an Option for Select (drop-down)
3. $ ("# select_id "). prepend ("<option value = '0'> Select </option>"); // insert an Option for Select (first position)
4. $ ("# select_id option: last"). remove (); // Delete the maximum Option of the index value in the Select statement (last one)
5. $ ("# select_id option [index = '0']"). remove (); // Delete the Option with the index value 0 in Select (the first option)
6. $ ("# select_id option [value = '3']"). remove (); // Delete the Option with Value = '3' In the Select statement
7. $ ("# select_id option [text = '4']"). remove (); // Delete the Option of '4' Text = '4' in Select
8. $ ("# select_id"). empty (); // clear the option
 

1. jQuery gets the Text and Value selected by the Select statement:
2. $ ("# select_id"). change (function () {// code...}); // Add an event for Select, triggered when one of the Select events is selected
3. var checkText = $ ("# select_id"). find ("option: selected"). text (); // obtain the selected Text
4. var checkValue = $ ("# select_id"). val (); // obtain the Value selected by Select
5. var checkIndex = $ ("# select_id"). get (0). selectedIndex; // obtain the index value selected by Select
6. var maxIndex = $ ("# select_id option: last"). attr ("index"); // obtain the largest index Value of Select. jQuery sets the Text and Value selected by Select: