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

如果你这样写:

$(文档).off(“点击”)。on("click", "#btnID", function(){})

然后,它将禁用所有项目的单击事件。

如果您只是想关闭单击特定的按钮,请执行此操作

美元(文件)。关掉(“点击”、“# btnID”)。on(点击,btnID,功能)

其他回答

试试这个方法:

<a href="javascript:void(0)" onclick="this.onclick = false; fireThisFunctionOnlyOnce()"> Fire function </a>

https://jsfiddle.net/0vgchj9n/1/

为了确保事件总是只触发一次,可以使用Jquery .one()。JQuery可以确保你的事件处理程序只被调用一次。此外,您还可以订阅一个事件处理程序,以便在完成当前单击操作的处理后允许进一步单击。

<div id="testDiv">
  <button class="testClass">Test Button</button>
</div>

var subscribeClickEvent = function() {$("#testDiv").one("click", ".testClass", clickHandler);};

function clickHandler() {
  //... perform the tasks  
  alert("you clicked the button");
  //... subscribe the click handler again when the processing of current click operation is complete  
  subscribeClickEvent();
}

subscribeClickEvent();

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);

我们必须停止传播(),以避免点击触发事件太多次。

$(this).find('#cameraImageView').on('click', function(evt) {
   evt.stopPropagation();
   console.log("Camera click event.");
});

它阻止事件冒泡到DOM树,防止任何父处理程序被通知该事件。此方法不接受任何参数。

我们可以使用event. ispropagationstopped()来确定这个方法是否被调用过(在该事件对象上)。

此方法也适用于由trigger()触发的自定义事件。注意,这不会阻止同一元素上的其他处理程序运行。

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
}