Question

我使用jquery创建雪花。一切似乎都没问题，但是当你点击特定的片状物时，我想做警报选项，然后它应该警告信息。但我实现了警报选项不断触发的点击功能。我不确定我错在哪里。我试过preventDefault仍然没有任何反应。 http://jsfiddle.net/vicky081/4cZdu/12/

 function snowFalling(){

        // move the snow
        $('.snow').each(function(key, value){

            // check if the snow has reached the bottom of the screen
            if( parseInt($(this).css('top')) > windowHeight - 80 ) {

                // remove the snow from the HTML DOM structure
                $(this).remove();
            }       

            // set up a random speed
            var fallingSpeed = Math.floor(Math.random() * 5 + 1);

            // set up a random direction for the snow to move
            var movingDirection = Math.floor(Math.random()*2);

            // get the snow's current top
            var currentTop = parseInt($(this).css('top'));      

            // get the snow's current top
            var currentLeft = parseInt($(this).css('left'));                

            // set the snow's new top
            $(this).css('top', currentTop + fallingSpeed ); 

            // check if the snow should move to left or move to right
            if( movingDirection === 0){

                // set the snow move to right
                $(this).css('left', currentLeft + fallingSpeed );   

            }else {

                // set the snow move to left
                $(this).css('left', currentLeft + -(fallingSpeed) );                

            }                   

        }); 
        jQuery(this).click(function() {
            alert('You Clicked');
        });

        // repeat the rollIt() function for each 200 microseconds
        window.setTimeout(snowFalling, 200);            

    }        

    // call the function when the document is loaded completely
    generateSnow();   
    snowFalling();

});

现在我想提醒特定的点击。点击雪花片如何防止多重警报。感谢。

Answer 1

如果您只想在单击雪时发出警报，请将处理程序移动到创建雪花的位置，而不是像我们当前更新时那样。

$('<div />')
    .addClass('snow')
    .css('top', snowTop)
    .css('left', snowLeft)
    .css('position','absolute')
    .html('*')
    .click(function() {
        alert('You Clicked');
    })
);

jsFiddle

Answer 2

你在每个雪花元素上每200毫秒绑定一个点击处理程序。

看起来generateSnow()是绑定点击处理程序的好地方。

你也可以在DOM ready上使用事件委托和绑定：

$(document).on('click', '.snow', function() {
    alert('You clicked');
});

Answer 3

生成雪花后，只需将click处理程序移到snowFalling函数之外：

JSFiddle

// this function is to alter the top of each snow, using the handy .each() jQuery method
function snowFalling(){

    // move the snow
    $('.snow').each(function(key, value){

        // check if the snow has reached the bottom of the screen
        if( parseInt($(this).css('top')) > windowHeight - 80 ) {

            // remove the snow from the HTML DOM structure
            $(this).remove();
        }       

        // set up a random speed
        var fallingSpeed = Math.floor(Math.random() * 5 + 1);

        // set up a random direction for the snow to move
        var movingDirection = Math.floor(Math.random()*2);

        // get the snow's current top
        var currentTop = parseInt($(this).css('top'));      

        // get the snow's current top
        var currentLeft = parseInt($(this).css('left'));                

        // set the snow's new top
        $(this).css('top', currentTop + fallingSpeed ); 

        // check if the snow should move to left or move to right
        if( movingDirection === 0){

            // set the snow move to right
            $(this).css('left', currentLeft + fallingSpeed );   

        }else {

            // set the snow move to left
            $(this).css('left', currentLeft + -(fallingSpeed) );                

        }                   

    }); 

    // repeat the rollIt() function for each 200 microseconds
    window.setTimeout(snowFalling, 200);            

}        

// call the function when the document is loaded completely
generateSnow();  
snowFalling();

$('.snow').click(function() {
    alert('You Clicked');
});

在jquery中创建雪花

3 个答案:

jsFiddle