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jquery - 如何从长按 jQuery 函数创建自定义动画

转载 作者:行者123 更新时间:2023-12-03 22:50:48 26 4
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已更新(添加了答案)

(function($) {
$.fn.longpress = function(longCallback, duration) {

// set some defaults
let defaults = {
click: function(el, e) {},
start: function(el, e) { el.css("color", "#000"); },
complete: function(el, e) { el.css("color", "#FFF"); },
cancel: function(el, e) { el.css("color", "#F00"); },
duration: 1000
};

// extend the options
let options = $.extend({}, defaults);

return this.each(function() {
var $this = $(this);

// to keep track of how long something was pressed
var mouse_down_time;
var timeout;
$this.data("clicked", "false");

// mousedown or touchstart callback
function mousedown_callback(e) {

// start callback
options.start($this, e);

$this.data("clicked", "true");
mouse_down_time = new Date().getTime();
var context = $(this);

// set a timeout to call the longpress callback when time elapses
timeout = setTimeout(function() {
if (typeof longCallback === "function") {
longCallback.call(context, e);
options.complete($this, e);
$this.data("clicked", "false");
} else {
$.error('Callback required for long press. You provided: ' + typeof longCallback);
}
}, options.duration);

}

// mouseup or touchend callback
function mouseup_callback(e) {
var press_time = new Date().getTime() - mouse_down_time;

if (press_time < options.duration) {
// cancel the timeout
clearTimeout(timeout);
$this.data("clicked", "false");

// call the click if provided
options.click($this, e);
}
}

// cancel long press event if the finger or mouse was moved
function move_callback(e) {
let isClicked = $this.data("clicked");
if (isClicked == "false")
return;

// call the cancel callback
options.cancel($this, e);
clearTimeout(timeout);
$this.data("clicked", "false");
}


// Browser Support
$this.on('mousedown', mousedown_callback);
$this.on('mouseup', mouseup_callback);
$this.on('mousemove', move_callback);

// Mobile Support
$this.on('touchstart', mousedown_callback);
$this.on('touchend', mouseup_callback);
$this.on('touchmove', move_callback);
});
};
}(jQuery));
<小时/>

我不久前发现了一个 jQuery 插件(不记得来源了),它允许我在网站上拥有长按功能:

(function(b) {
b.fn.longpress = function(e, c, d) {
"undefined" === typeof d && (d = 1000);
return this.each(function() {
function g(a) {
h = (new Date).getTime();
var c = b(this);
f = setTimeout(function() {
"function" === typeof e ? e.call(c, a) : b.error("Callback required for long press. You provided: " + typeof e)
}, d)
}

function k(a) {
(new Date).getTime() - h < d && (clearTimeout(f), "function" === typeof c ? c.call(b(this), a) : "undefined" !== typeof c && b.error("Optional callback for short press should be a function."))
}

function l(a) {
clearTimeout(f)
}
var a = b(this),
h, f;
a.on("mousedown", g);
a.on("mouseup", k);
a.on("mousemove", l);
a.on("touchstart", g);
a.on("touchend", k);
a.on("touchmove", l)
})
}
})(jQuery);

效果很好,但我想知道是否有办法让背景从 #fff 变为 #000 或制作任何其他基于长按的持续时间。

我一直在思考,但没能弄清楚。我试图为长按的每一秒添加一个类,然后为每个类添加一个 CSS 规则。然后,我尝试在 CSS 中使用 steps 来计时,但无法使其正常工作,因为只有在长按成功未加载时才会添加类。

最佳答案

原始插件可以在这里找到:https://github.com/vaidik/jquery-longpress .

我已修改为接受选项对象(在评论中解释)。这是一个例子:

(function($) {
$.fn.longpress = function(opts) {
let defaults = {
click: function(el, e) {},
start: function(el, e) {},
complete: function(el, e) {},
duration: 500
};

let options = $.extend({}, defaults, opts);

return this.each(function() {
var $this = $(this);

// to keep track of how long something was pressed
var mouse_down_time;
var timeout;
$this.data("clicked", "false");

// mousedown or touchstart callback
function mousedown_callback(e) {

// start callback
options.start($this, e);

$this.data("clicked", "true");
mouse_down_time = new Date().getTime();
var context = $(this);

// set a timeout to call the longpress callback when time elapses
timeout = setTimeout(function() {
options.complete($this, e);
$this.data("clicked", "false");
}, options.duration);
}

// mouseup or touchend callback
function mouseup_callback(e) {
var press_time = new Date().getTime() - mouse_down_time;
if (press_time < options.duration) {
// cancel the timeout
clearTimeout(timeout);
$this.data("clicked", "false");

// call the click if provided
options.click($this, e);
}
}

// cancel long press event if the finger or mouse was moved
function move_callback(e) {
let isClicked = $this.data("clicked");
if (isClicked == "false")
return;

// call the cancel callback
options.cancel($this, e);
clearTimeout(timeout);
$this.data("clicked", "false");
}


// Browser Support
$this.on('mousedown', mousedown_callback);
$this.on('mouseup', mouseup_callback);
$this.on('mousemove', move_callback);

// Mobile Support
$this.on('touchstart', mousedown_callback);
$this.on('touchend', mouseup_callback);
$this.on('touchmove', move_callback);
});
};
}(jQuery));

let options = {
// Callback after a "normal" click has completed
click: function(el, event) {
el.removeClass("rotate");
},
// callback after longpress completed
complete: function(el, event) {
el.removeClass("rotate");
},
// callback before click starts (for both normal and longpress clicks)
start: function(el, event) {
el.addClass("rotate");
},
// Callback when click is cancelled (user moves mouse)
cancel: function(el, event) {
el.removeClass("rotate");
},
// Longpress duration
duration: 5000
};
$('#button').longpress(options);
div {
border: 1px solid;
width: 200px;
height: 200px;
left: 50px;
top: 50px;
position: relative;
}

.rotate {
animation: 1s rotate infinite linear;
}

@keyframes rotate {
100% {
transform: rotate(1turn);
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id='button'>

</div>

关于jquery - 如何从长按 jQuery 函数创建自定义动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58776275/

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