我试图在Javascript中编写一个视频扑克游戏,作为一种获得它的基础知识的方式,我遇到了一个问题,jQuery点击事件处理程序被多次触发。

They're attached to buttons for placing a bet, and it works fine for placing a bet on the first hand during a game (firing only once); but in betting for the second hand, it fires the click event twice each time a bet or place bet button is pressed (so twice the correct amount is bet for each press). Overall, it follows this pattern for number of times the click event is fired when pressing a bet button once--where the ith term of the sequence is for the betting of the ith hand from the beginning of the game: 1, 2, 4, 7, 11, 16, 22, 29, 37, 46, which appears to be n(n+1)/2 + 1 for whatever that's worth--and I wasn't smart enough to figure that out, I used OEIS. :)

这是一个点击事件处理程序的函数;希望这很容易理解(如果不容易,请告诉我,我也想在这方面做得更好):

/** The following function keeps track of bet buttons that are pressed, until place button is pressed to place bet. **/
function pushingBetButtons() {
    $("#money").text("Money left: $" + player.money); // displays money player has left

    $(".bet").click(function() {
        var amount = 0; // holds the amount of money the player bet on this click
        if($(this).attr("id") == "bet1") { // the player just bet $1
            amount = 1;
        } else if($(this).attr("id") == "bet5") { // etc.
            amount = 5;
        } else if($(this).attr("id") == "bet25") {
            amount = 25;
        } else if($(this).attr("id") == "bet100") {
            amount = 100;
        } else if($(this).attr("id") == "bet500") {
            amount = 500;
        } else if($(this).attr("id") == "bet1000") {
            amount = 1000;
        }
        if(player.money >= amount) { // check whether the player has this much to bet
            player.bet += amount; // add what was just bet by clicking that button to the total bet on this hand
            player.money -= amount; // and, of course, subtract it from player's current pot
            $("#money").text("Money left: $" + player.money); // then redisplay what the player has left
        } else {
            alert("You don't have $" + amount + " to bet.");
        }
    });

    $("#place").click(function() {
        if(player.bet == 0) { // player didn't bet anything on this hand
            alert("Please place a bet first.");
        } else {
            $("#card_para").css("display", "block"); // now show the cards
            $(".card").bind("click", cardClicked); // and set up the event handler for the cards
            $("#bet_buttons_para").css("display", "none"); // hide the bet buttons and place bet button
            $("#redraw").css("display", "block"); // and reshow the button for redrawing the hand
            player.bet = 0; // reset the bet for betting on the next hand
            drawNewHand(); // draw the cards
        }
    });
}

如果你有任何想法或建议,或者我的问题的解决方案与这里的另一个问题的解决方案相似,请告诉我(我看过许多类似标题的帖子,但没有幸运地找到一个适合我的解决方案)。


当前回答

我有这个问题与动态生成的链接:

美元(文档)。在('点击','#mylink',函数({…做东西…});

我发现用“body”替换文档可以解决这个问题:

美元(的身体)。在('点击','#mylink',函数({…做东西…});

其他回答

当一个事件被多次注册时,它将被多次触发(即使是同一个处理程序)。

如美元(“ctrl”)。On ('click', somefunction)如果每次页面部分刷新时都执行这段代码,则每次也会注册该事件。因此,即使ctrl只被单击一次,它也可能会执行“somefunction”多次——执行多少次取决于它被注册了多少次。

这对于任何用javascript注册的事件都是正确的。

解决方案:

确保只调用“on”一次。

出于某种原因,如果你不能控制架构,那么就这样做:

$ (" ctrl ") (.off’click’); $ (" ctrl ")。据(’click’somefunction);

在我的例子中,我用<script>标记在页面上加载了两次相同的*.js文件,所以两个文件都将事件处理程序附加到元素上。我删除了重复的声明,这就解决了问题。

当我处理这个问题时,我总是使用:

$(".bet").unbind("click").bind("click", function (e) {
  // code goes here
}

通过这种方式,我可以在同一笔划中解除绑定并重新绑定。

发生这种情况是因为特定事件多次绑定到同一元素。

对我有效的解决方案是:

使用.die()方法杀死所有附加的事件。

然后附加方法监听器。

因此,

$('.arrow').click(function() {
// FUNCTION BODY HERE
}

应该是:

$('.arrow').die("click")
$('.arrow').click(function() {
// FUNCTION BODY HERE
}

.在页面的生命周期中只触发一次

因此,如果您想进行验证,这不是正确的解决方案,因为当您在验证后不离开页面时,您就永远不会回来。更好地使用

$(".bet").on('click',function() 
{ //validation 
   if (validated) { 
      $(".bet").off('click'); //prevent to fire again when we are not yet off the page
      //go somewhere
    }
});