Javascript 在每个循环中更新progressbar
我有一个进度条,在多次迭代循环中更新 (单击开始按钮前打开控制台)Javascript 在每个循环中更新progressbar,javascript,jquery,css,progress,Javascript,Jquery,Css,Progress,我有一个进度条,在多次迭代循环中更新 (单击开始按钮前打开控制台) var progressbar={}; $(函数(){ 进度条={ /**初步进展*/ 进展:0, /**进度条的最大宽度*/ 最大进度:0, /**progressbar的内部元素(填充框)*/ $progressbar:$(“#progressbar”), /**设置进度条*/ 设置:函数(num){ if(this.progress\u max&&num){ this.progress=num/this.progress
var progressbar={};
$(函数(){
进度条={
/**初步进展*/
进展:0,
/**进度条的最大宽度*/
最大进度:0,
/**progressbar的内部元素(填充框)*/
$progressbar:$(“#progressbar”),
/**设置进度条*/
设置:函数(num){
if(this.progress\u max&&num){
this.progress=num/this.progress_max*100;
console.log('percent:'+this.progress+'%-'+num+'/'+this.progress_max);
this.$progress_bar.width(字符串(this.progress)+'%');
}
},
fn_wrap:函数(num){
setTimeout(函数(){
此.set(num);
}, 0);
}
};
});
$(“#开始按钮”)。在('单击',函数(){
var迭代次数=100000000;
progressbar.progress_max=迭代次数;
变量循环=函数(){
对于(var i=1;i我猜您的所有进度更新都在同一个调用堆栈中运行。当JavaScript代码运行时,DOM无法更新。也许这将帮助您找到解决方法。这里是更新的fiddle
我用animate使它成为一个进度条状的外观和感觉。
希望这对你有帮助
var progressbar = {};
$(function() {
progressbar = {
/** initial progress */
progress : 0,
/** maximum width of progressbar */
progress_max : 0,
/** The inner element of the progressbar (filled box). */
$progress_bar : $('#progressbar'),
/** Method to set the progressbar.*/
set : function(num) {
if (this.progress_max && num) {
this.progress = num / this.progress_max * 100;
console.log('percent: ' + this.progress + '% - ' + num + '/' + this.progress_max);
$('#progressbar').animate({
width : String(this.progress) + '%',
}, 500, function() {
// Animation complete.
});
}
},
fn_wrap : function(num) {
setTimeout(function() {
this.set(num);
}, 0);
}
};
});
$('#start_button').on('click', function() {
$('#progressbar').css('width', '0%');
var iterations = 1000000000;
progressbar.progress_max = iterations;
var loop = function() {
for (var i = 1; i <= iterations; i++) {
if (iterations % i === 100) {
progressbar.set(i);
//only updates the progressbar in the last iteration
}
}
}
loop();
});
好的,我在这个问题的答案中找到了一个解决方案:
var i=0;
(函数循环(){
i++;
如果(迭代次数%i==100){
progressbar.set(i);//更新progressbar,即使在循环中也是如此
}
if(i<迭代次数){
setTimeout(循环,0);
}
})();
我的解决方案:
您真正想要的是一个异步循环,允许浏览器在迭代之间更新DOM
JSFiddle:
一些HTML:
<div class="progress-bar"><div style="width: 0"></div></div>
还有一些JavaScript将东西连接在一起:
var progressBar = document.querySelector(".progress-bar div"),
items = [1,2,3,4,5,6,7,8,9,10];
delayedLoop(items, 500, function(item, index) {
var width = (item / items.length * 100) + "%";
progressBar.style.width = width;
progressBar.innerHTML = width;
});
在继续循环之前,您可以使用promissions
等待宽度设置完成。
更新100000000次迭代的进度条时,如果按1乘以1,则速度会很慢,因此您可能会发现降低更新频率很有用。
我没有使用for
循环,而是使用了一个递归函数,在承诺实现时循环
set: function (num) {
var deferred = $.Deferred();
if (this.progress_max && num) {
this.progress = num / this.progress_max * 100;
var self = this;
self.$progress_bar.animate({"width": String(this.progress) + '%'}, "fast", function() {
deferred.resolve();
});
return deferred;
}
}
$('#start_button').on('click', function () {
var iterations = 1000000000;
var i = 0;
progressbar.progress_max = iterations;
var loop = function(){
i+=100000000;
if(i <= iterations){
progressbar.set(i).then(function(){
loop();
}); ;
}
};
loop();
});
set:function(num){
var deferred=$.deferred();
if(this.progress\u max&&num){
this.progress=num/this.progress_max*100;
var self=这个;
self.$progress_bar.animate({“width”:String(this.progress)+'%},“fast”,function(){
延迟。解决();
});
延期归还;
}
}
$(“#开始按钮”)。在('单击',函数(){
var迭代次数=100000000;
var i=0;
progressbar.progress_max=迭代次数;
var循环=函数(){
i+=100000000;
如果(i让我们将其分解为步骤
步骤1:清理HTML
假设您的问题的目的是了解如何使用进度条,而不是样式或标签(加载、请耐心等待等)。让我们只使用进度条和开始按钮
<div id='progressbar-outer' style="">
<div id='progressbar' style=""></div>
</div>
<button id="start_button">Start</button>
步骤3:在它所属的位置使用setTimeout
在代码中,您已使用setTimeout
设置进度条的值。但是for
循环仍处于活动状态
for (var i = 1; i <= iterations; i++) {
if (iterations % i === 100) {
progressbar.set(i); //only updates the progressbar in the last iteration
//progressbar.fn_wrap(i); //even worse, since no output to the console is produced
//setTimeout(function() {
// progressbar.set(i);
//}, 0);
}
}
预览
试试这把小提琴:你必须使用它,否则浏览器将阻塞直到你的循环完成。传递给requestAnimationFrame
的回调将获得一个时间戳作为参数,你可以使用它来计算进度。你想做什么?为什么需要它?你应该只使用进度条当你不得不等待某件事情完成时。但我们不知道你在页面上做了什么
如果要显示ajax上载的进度,请执行以下操作:
$.ajax({
...
xhr: function() {
var xhr = $.ajaxSettings.xhr();
$(xhr.upload).bind("progress", function(event) {
var e = event.originalEvent;
var percent = 0;
if (e.lengthComputable)
percent = Math.ceil(e.loaded/e.total*100);
$("#progress").width(percent+"%");
});
return xhr;
}
...
});
对于图像,您需要一个ajax调用:
$.ajax({
method: "GET",
url: "http://example.com/path/image.jpg",
xhr: function() {/* see the code above*/ }
...
});
要获取上载文件的内容,请执行以下操作:
var reader = new FileReader();
reader.readAsText(uploadedFile);
$(reader).bind("progress", function(e) {
var percent = 0;
if (e.lengthComputable)
percent = Math.ceil(e.loaded/e.total*100);
$("#progress").css("width", percent+"%");
});
对于大范围的流程,如数学或附加大量div,需要10+秒:
Main.js:
var worker = new Worker("Worker.js");
$(worker).bind("message", function(data) {
$("#progress").width((data*100)+"%");
});
Worker.js:
var total = 43483,
finished = 0,
doStuff = function() {
++finished;
return 1+1;
};
setInterval(function()
{
self.postMessage(finished/total);
}, 100);
for (var i = 0; i < total; ++i)
setTimeout(doStuff, i*10);
以下是我对这个问题的2点看法:
使用。webworker blob代码来自
网络工作者代码:
<script type="text/ww">
function loop(e) {
var data = JSON.parse(e.data);
var i = parseInt(data.i, 10);
var iterations = parseInt(data.iterations, 10);
while (iterations % ++i !== 100 && i <= iterations);
if(i <= iterations) {
self.postMessage(JSON.stringify({ i: i, iterations: iterations }));
}
}
self.onmessage = function(e) {
loop(e);
};
</script>
挂起UI线程,但在视觉上更改宽度,因为我使用requestAnimationFrame中断计数,更改progressbar的宽度,然后继续计数
function loopFrame(i, iterations) {
requestAnimationFrame(function() {
if (iterations % i === 100) {
progressbar.set(i);
}
if(i < iterations) {
loopFrame(i + 1, iterations);
}
});
}
$('#start_button').on('click', function () {
var iterations = 1000000000;
console.log(iterations);
progressbar.progress_max = iterations;
loopFrame(0, iterations);
});
函数环帧(i,迭代){
requestAnimationFrame(函数(){
如果(迭代次数%i==100){
progressbar.set(i);
}
if(i<迭代次数){
环帧(i+1,迭代);
}
});
}
$(“#开始按钮”)。在('单击',函数(){
var迭代次数=100000000;
console.log(迭代);
progressbar.progress_max=迭代次数;
loopFrame(0,迭代次数);
});
也许这会有用
var service = new Object();
//function with interrupt for show progress of operations
service.progressWhile = new Object();
service.progressWhile.dTime = 50; //step ms between callback display function
service.progressWhile.i = 0; //index
service.progressWhile.timer = 0; //start time for cycle
//@parametr arr - array for actions
//@parametr actionCallback - The function for processing array's elements
//@parametr progressCallback - function to display the array index
function progressWhile(arr, actionCallback, progressCallback) {
try {
var d = new Date();
service.progressWhile.timer = d.getTime();
log(service.progressWhile.i);
if (service.progressWhile.i >= arr.length) {
service.progressWhile.i = 0;
return;
}
while (service.progressWhile.i < arr.length) {
actionCallback(arr[service.progressWhile.i++]);
d = new Date();
if (d.getTime() - service.progressWhile.timer > service.progressWhile.dTime) {
break;
}
}
if (progressCallback != undefined)
progressCallback(service.progressWhile.i);
} catch (er) {
log(er);
return;
}
setTimeout(function () {
progressWhile(arr, actionCallback, progressCallback);
}, 0);
}
var服务=新对象();
//具有中断功能,用于显示操作进度
service.progressWhile=新对象();
service.progressWhile.dTime=50;//回调显示函数之间的步长ms
service.progressWhile.i=0;//索引
service.progressWhile.timer=0;//循环的开始时间
//@parametr arr-用于操作的数组
//@Parameterr actionCallback-用于处理数组元素的函数
//@parametr progressCallback-用于显示数组索引的函数
函数progressWhile(arr、actionCallback、progressCallback){
试一试{
var d=新日期();
service.progressWhile.timer=d.getTime();
日志(service.progressWhile.i);
if(service.progressWhile.i>=arr.length){
service.progressWhile.i=0;
返回;
}
while(service.progressWhile.i$.ajax({
method: "GET",
url: "http://example.com/path/image.jpg",
xhr: function() {/* see the code above*/ }
...
});
var reader = new FileReader();
reader.readAsText(uploadedFile);
$(reader).bind("progress", function(e) {
var percent = 0;
if (e.lengthComputable)
percent = Math.ceil(e.loaded/e.total*100);
$("#progress").css("width", percent+"%");
});
var worker = new Worker("Worker.js");
$(worker).bind("message", function(data) {
$("#progress").width((data*100)+"%");
});
var total = 43483,
finished = 0,
doStuff = function() {
++finished;
return 1+1;
};
setInterval(function()
{
self.postMessage(finished/total);
}, 100);
for (var i = 0; i < total; ++i)
setTimeout(doStuff, i*10);
$("#progress").animate({width: "100%"}, 3000);
<script type="text/ww">
function loop(e) {
var data = JSON.parse(e.data);
var i = parseInt(data.i, 10);
var iterations = parseInt(data.iterations, 10);
while (iterations % ++i !== 100 && i <= iterations);
if(i <= iterations) {
self.postMessage(JSON.stringify({ i: i, iterations: iterations }));
}
}
self.onmessage = function(e) {
loop(e);
};
</script>
var ww = document.querySelector('script[type="text/ww"]'),
code = ww.textContent,
blob = new Blob([code], {type: 'text/javascript'}),
blobUrl = URL.createObjectURL(blob),
worker = new Worker(blobUrl);
worker.onmessage = function(e) {
var data = JSON.parse(e.data);
var i = parseInt(data.i, 10);
var iterations = parseInt(data.iterations, 10);
progressbar.set(i);
worker.postMessage(JSON.stringify({ i: i, iterations: iterations }));
}
$('#start_button').on('click', function () {
var iterations = 1000000000;
progressbar.progress_max = iterations;
worker.postMessage(JSON.stringify({ i: 0, iterations: iterations }));
});
function loopFrame(i, iterations) {
requestAnimationFrame(function() {
if (iterations % i === 100) {
progressbar.set(i);
}
if(i < iterations) {
loopFrame(i + 1, iterations);
}
});
}
$('#start_button').on('click', function () {
var iterations = 1000000000;
console.log(iterations);
progressbar.progress_max = iterations;
loopFrame(0, iterations);
});
var service = new Object();
//function with interrupt for show progress of operations
service.progressWhile = new Object();
service.progressWhile.dTime = 50; //step ms between callback display function
service.progressWhile.i = 0; //index
service.progressWhile.timer = 0; //start time for cycle
//@parametr arr - array for actions
//@parametr actionCallback - The function for processing array's elements
//@parametr progressCallback - function to display the array index
function progressWhile(arr, actionCallback, progressCallback) {
try {
var d = new Date();
service.progressWhile.timer = d.getTime();
log(service.progressWhile.i);
if (service.progressWhile.i >= arr.length) {
service.progressWhile.i = 0;
return;
}
while (service.progressWhile.i < arr.length) {
actionCallback(arr[service.progressWhile.i++]);
d = new Date();
if (d.getTime() - service.progressWhile.timer > service.progressWhile.dTime) {
break;
}
}
if (progressCallback != undefined)
progressCallback(service.progressWhile.i);
} catch (er) {
log(er);
return;
}
setTimeout(function () {
progressWhile(arr, actionCallback, progressCallback);
}, 0);
}