A three-level linkage drop-down list, the list of options are taken from the database, json type, choose good value after the query, submit the background because then page refresh things are not in the drop-down list, and choose the user experience is not very good, again not only want to display the selected value, want to put the list can also be displayed in the drop-down box, you did a great god solution, don't know did I clearly stated that,

CodePudding user response:

Using ajax to submit, partial refresh, don't refresh the page