我有这个计数器，它运作良好，但是我的问题是，只有当我在网站上的那个位置滚动时，如何使它启动。现在他甚至在网站满载之前就结束了。
我尝试过这种方法，但是我没有足够的知识让javascript一个人做。
$(window).scroll(function() {
var scroll = $(window).();
if (scroll >= 1) {
;
} else {
;
}
});
对这个问题有什么解决办法吗？
(function($) {
$.fn.countTo = function(options) {
options = options || {};
return $(this).each(function() {
// set options for current element
var settings = $.extend({}, $.fn.countTo.defaults, {
from: $(this).data('from'),
to: $(this).data('to'),
speed: $(this).data('speed'),
refreshInterval: $(this).data('refresh-interval'),
decimals: $(this).data('decimals')
}, options);
// how many times to update the value, and how much to increment the value on each update
var loops = Math.ceil(settings.speed / settings.refreshInterval),
increment = (settings.to - settings.from) / loops;
// references & variables that will change with each update
var self = this,
$self = $(this),
loopCount = 0,
value = settings.from,
data = $self.data('countTo') || {};
$self.data('countTo', data);
// if an existing interval can be found, clear it first
if (data.interval) {
clearInterval(data.interval);
}
data.interval = setInterval(updateTimer, settings.refreshInterval);
// initialize the element with the starting value
render(value);
function updateTimer() {
value += increment;
loopCount++;
render(value);
if (typeof(settings.onUpdate) == 'function') {
settings.onUpdate.call(self, value);
}
if (loopCount >= loops) {
// remove the interval
$self.removeData('countTo');
clearInterval(data.interval);
value = settings.to;
if (typeof(settings.onComplete) == 'function') {
settings.onComplete.call(self, value);
}
}
}
function render(value) {
var formattedValue = settings.formatter.call(self, value, settings);
$self.html(formattedValue);
}
});
};
$.fn.countTo.defaults = {
from: 0, // the number the element should start at
to: 0, // the number the element should end at
speed: 1000, // how long it should take to count between the target numbers
refreshInterval: 100, // how often the element should be updated
decimals: 0, // the number of decimal places to show
formatter: formatter, // handler for formatting the value before rendering
onUpdate: null, // callback method for every time the element is updated
onComplete: null // callback method for when the element finishes updating
};
function formatter(value, settings) {
return value.toFixed(settings.decimals);
}
}(jQuery));
jQuery(function($) {
// custom formatting example
$('.count-number').data('countToOptions', {
formatter: function(value, options) {
return value.toFixed(options.decimals).replace(/\B(?=(?:\d{3})+(?!\d))/g, ',');
}
});
// start all the timers
$('.timer').each(count);
function count(options) {
var $this = $(this);
options = $.extend({}, options || {}, $this.data('countToOptions') || {});
$this.countTo(options);
}
});.col_half {
width: 49%;
}
.col_third {
width: 32%;
}
.col_fourth {
width: 17.5%;
}
.col_fifth {
width: 18.4%;
}
.col_sixth {
width: 15%;
}
.col_three_fourth {
width: 74.5%;
}
.col_twothird {
width: 66%;
}
.col_half,
.col_third,
.col_twothird,
.col_fourth,
.col_three_fourth,
.col_fifth {
position: relative;
display: inline;
display: inline-block;
float: left;
margin-right: 2%;
margin-bottom: 20px;
}
.end {
margin-right: 0 !important;
}
/* Column Grids End */
.wrapper {
margin: 30px auto;
position: relative;
}
.counter {
padding: 20px 0;
border-radius: 5px;
}
.count-title {
font-size: 40px;
font-weight: normal;
margin-top: 10px;
margin-bottom: 0;
text-align: center;
color: black;
}
.count-text {
font-size: 13px;
font-weight: normal;
margin-top: 10px;
margin-bottom: 0;
text-align: center;
color: black;
}
.fa-2x {
margin: 0 auto;
float: none;
display: table;
color: red;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="wrapper">
<div class="counter col_fourth">
<i class="fa fa-code fa-2x"></i>
<h2 class="timer count-title count-number" data-to="300" data-speed="15000"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
<div class="counter col_fourth">
<i class="fa fa-coffee fa-2x"></i>
<h2 class="timer count-title count-number" data-to="1700" data-speed="1500"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
<div class="counter col_fourth end">
<i class="fa fa-bug fa-2x"></i>
<h2 class="timer count-title count-number" data-to="157" data-speed="1500"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
</div>
答案 0 :(得分：3)
在scroll上，您必须将计时器在页面中的位置与滚动量加的窗口高度进行比较。那是计时器出现的时候...
// start all the timers
var timerRan = false;
$(window).on("scroll", function(){
if( ($(window).scrollTop() + $(window).height() > $(".wrapper").position().top) && !timerRan ){
$('.timer').each(count);
timerRan = true;
}
});
并且有一个“标志”以确保计时器仅启动一次...
在下面的代码段中，我只是添加了一个“ spacer” div以使演示可滚动...
(function($) {
$.fn.countTo = function(options) {
options = options || {};
return $(this).each(function() {
// set options for current element
var settings = $.extend({}, $.fn.countTo.defaults, {
from: $(this).data('from'),
to: $(this).data('to'),
speed: $(this).data('speed'),
refreshInterval: $(this).data('refresh-interval'),
decimals: $(this).data('decimals')
}, options);
// how many times to update the value, and how much to increment the value on each update
var loops = Math.ceil(settings.speed / settings.refreshInterval),
increment = (settings.to - settings.from) / loops;
// references & variables that will change with each update
var self = this,
$self = $(this),
loopCount = 0,
value = settings.from,
data = $self.data('countTo') || {};
$self.data('countTo', data);
// if an existing interval can be found, clear it first
if (data.interval) {
clearInterval(data.interval);
}
data.interval = setInterval(updateTimer, settings.refreshInterval);
// initialize the element with the starting value
render(value);
function updateTimer() {
value += increment;
loopCount++;
render(value);
if (typeof(settings.onUpdate) == 'function') {
settings.onUpdate.call(self, value);
}
if (loopCount >= loops) {
// remove the interval
$self.removeData('countTo');
clearInterval(data.interval);
value = settings.to;
if (typeof(settings.onComplete) == 'function') {
settings.onComplete.call(self, value);
}
}
}
function render(value) {
var formattedValue = settings.formatter.call(self, value, settings);
$self.html(formattedValue);
}
});
};
$.fn.countTo.defaults = {
from: 0, // the number the element should start at
to: 0, // the number the element should end at
speed: 1000, // how long it should take to count between the target numbers
refreshInterval: 100, // how often the element should be updated
decimals: 0, // the number of decimal places to show
formatter: formatter, // handler for formatting the value before rendering
onUpdate: null, // callback method for every time the element is updated
onComplete: null // callback method for when the element finishes updating
};
function formatter(value, settings) {
return value.toFixed(settings.decimals);
}
}(jQuery));
jQuery(function($) {
// custom formatting example
$('.count-number').data('countToOptions', {
formatter: function(value, options) {
return value.toFixed(options.decimals).replace(/\B(?=(?:\d{3})+(?!\d))/g, ',');
}
});
// start all the timers
var timerRan = false;
$(window).on("scroll", function(){
if( ($(window).scrollTop() + $(window).height() > $(".wrapper").position().top) && !timerRan ){
$('.timer').each(count);
timerRan = true;
}
});
function count(options) {
var $this = $(this);
options = $.extend({}, options || {}, $this.data('countToOptions') || {});
$this.countTo(options);
}
});.spacer{ /* Just for the demo */
height:1000px;
}
.col_half {
width: 49%;
}
.col_third {
width: 32%;
}
.col_fourth {
width: 17.5%;
}
.col_fifth {
width: 18.4%;
}
.col_sixth {
width: 15%;
}
.col_three_fourth {
width: 74.5%;
}
.col_twothird {
width: 66%;
}
.col_half,
.col_third,
.col_twothird,
.col_fourth,
.col_three_fourth,
.col_fifth {
position: relative;
display: inline;
display: inline-block;
float: left;
margin-right: 2%;
margin-bottom: 20px;
}
.end {
margin-right: 0 !important;
}
/* Column Grids End */
.wrapper {
margin: 30px auto;
position: relative;
}
.counter {
padding: 20px 0;
border-radius: 5px;
}
.count-title {
font-size: 40px;
font-weight: normal;
margin-top: 10px;
margin-bottom: 0;
text-align: center;
color: black;
}
.count-text {
font-size: 13px;
font-weight: normal;
margin-top: 10px;
margin-bottom: 0;
text-align: center;
color: black;
}
.fa-2x {
margin: 0 auto;
float: none;
display: table;
color: red;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="spacer"></div> <!-- Just for the demo -->
<div class="wrapper">
<div class="counter col_fourth">
<i class="fa fa-code fa-2x"></i>
<h2 class="timer count-title count-number" data-to="300" data-speed="15000"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
<div class="counter col_fourth">
<i class="fa fa-coffee fa-2x"></i>
<h2 class="timer count-title count-number" data-to="1700" data-speed="1500"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
<div class="counter col_fourth end">
<i class="fa fa-bug fa-2x"></i>
<h2 class="timer count-title count-number" data-to="157" data-speed="1500"></h2>
<p class="count-text ">SomeText GoesHere</p>
</div>
</div>