Question

我有2个选择标签。第二是取决于第一个。如果我只检查值，它会工作，但我还需要检查是否已选中。

if(el.val() === "LOCATIONS" || el.is(' option:selected') ){
 $("#status option").remove();
 $("#status").append("<option value=''>All Packages</option><option value=''>KL</option>");
}

我正在尝试依赖选择下拉列表。如果我删除el.is('option:selected')，它会根据所选的第一选择选项附加选项。但如果在第一个下拉列表中选择了任何选项，它也应附加选项

这里是jsfiddle

Answer 1

即使您检查import pygame, os, sys from pygame.locals import* pygame.init() sHEIGHT = 600 sWIDTH = 800 gName = "Survive" fps = pygame.time.Clock() FPS = 10 GD = pygame.display.set_mode((sWIDTH,sHEIGHT)) class Main: white = (255,255,255) def display(white): pygame.display.set_caption(gName) GD.fill(white) def player1(): img ="Images/" health = 100 global movex global movexchange global movey global moveychange global imgplayer1 movex = 400 movey = 400 movexchange = 0 moveychange = 0 imgplayer1 = pygame.image.load(os.path.join(img, "Human.png")) pygame.display.update() def gameLoop(): fps.tick(FPS) while True: print(fps) global movexchange global moveychange global movex global movey for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.quit() sys.exit() if event.type == pygame.KEYDOWN: if event.key == pygame.K_a: moveychange = 0 movexchange -=5 if event.key == pygame.K_w: moveychange -=5 movexchange =0 if event.key == pygame.K_s: moveychange += 5 movexchange = 0 if event.key == pygame.K_d: moveychange = 0 movexchange +=5 if event.type == pygame.KEYUP: if event.key == pygame.K_a: movexchange =0 moveychange =0 if event.key == pygame.K_w: movexchange =0 moveychange =0 if event.key == pygame.K_s: movexchange =0 moveychange =0 if event.key == pygame.K_d: movexchange =0 moveychange =0 movex += movexchange movey += moveychange GD.blit(imgplayer1,(movex,movey)) pygame.display.update() display(white) player1() gameLoop()即所选选项的值，它也能正常工作。但要传递两个条件，您必须使用one condition而不是&& operator，您可以将其更改为el.is('option:selected')，如下所示，

＆＃13;

("el:selected");

＆＃13;

$(document).ready(function() {
var a = $("#source > option:selected").val();
if(a == "REGIONAL"){
    $("#status option").remove();
        $("#status").append("<option value=''>All Packages</option><option value='Airports'>Airports</option>");
}
$("#source").change(function() {    
    var el = $(this);
    if((el.val() === "AUDIENCES SEGMENT") && ('el:selected')) {
    $("#status option").remove();
    $("#status").append("<option value=''>All Packages</option><option value='Youth'>Youth</option><option value='Working Adults'>Working Adults</option><option value='Family'>Family</option><option value='Travellers'>Travellers</option>");
    }
      else if((el.val() === "REGIONAL") && ('el:selected')) {
        $("#status option").remove();
        $("#status").append("<option value=''>All Packages</option><option value='Airports'>Airports</option>");
        
        }
        
        else if((el.val() === "LOCATIONS") && ('el:selected')) {
        $("#status option").remove();
        $("#status").append("<option value=''>All Packages</option><option value=''>KL</option>");
        
        }
  });
  
});

＆＃13;

如果值相等或在jquery中选择，则追加选择选项

1 个答案: