Develop Reference

How to show a same html element's change in a loop with js

I want to show a progress by changing an element's text like below:
for (i = 0; i < 1000; ++i)
{
$('#progressing > #num').html(i + '/' + 1000);
// do other things
...
}
But it seems that explorer has mingle the change on the element, i can only see the last loop's result.
i have tried to use setInterval, and it works well:
setInterval(function(self) {
$('#progressing > #num').html(self.progress + '/' + 1000);
self.progress += 1;
}, 1, this);
But i think it's not cool. May i ask for a elegant way to show element change immediately, just like flush function in IO, or some other way?

Not sure what's not 'cool' about it. If it's meant to measure an actual download progress, this isn't the way to do it. But for a general purpose counter, it works fine. Note you can reduce the code to one line if you like
let progress=0, max=1000, s=setInterval(()=>(progress++ > max-1 ? clearInterval(this) : $('#el').html(progress + '/' + max)),10);
let progress=0, max=1000, s=setInterval(()=>(progress++ > max-1 ? clearInterval(this) : $('#el').html(progress + '/' + max)),10);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id='el'></div>

Because the for loop is running to fast, so the event will raise on the final result only. For debugging, i think you will need to log console or use interval instead of for loop.
var counter = 0;
var myInterval = setInterval(function(){
if(counter === 100){ //loop 100 times
//stop loop (finished loop)
clearInterval(myInterval);
}else{
counter ++;
$('#progressing > #num').html(self.progress + '/' + 1000);
//do your other code here
}
}, 2000); //each time process 2 seconds

Multiple instances of Setinterval

I have a little problem with my code.
I have it setup so that by default, a rotating fadeIn fadeOut slider is auto playing, and when a user clicks on a li, it will jump to that 'slide' and pause the slider for x amount of time.
The problem i have is that if the user clicks on multiple li's very fast, then it will run color1() multiple times with will start colorInterval multiple times. This gives a undesired effect.
So what i need help with, is figuring out how to reset my code each time a li is clicked, so whenever ColorClick is clicked, i want to make sure that there are no other instances of colorInterval before i start a new one.
Thanks in advance!
=================================
edit:
I now have another problem, i believe that i fixed the clearInterval problem, but now if you look at var reset, you'll see that it runs color1() each time a li is clicked, which runs multiple intervals, so i need to delete the previous instance of color1() each time it is called, to make sure that it doesnt repeat any code inside multiple times. So when a li is clicked delete any instances of color1()
or
i need that instead of running color1 in var reset, i will go straight to colorInterval instead of running color1() for each li clicked,
so run colorInterval after x amount of time in var reset.
function color1() {
var pass = 0;
var counter = 2;
var animationSpeed = 500;
var $colorContent = '.color-container-1 .color-content-container'
var $li = '.color-container-1 .main-color-container li'
$($li).on('click', function() {
colorClick($(this));
});
function colorClick($this) {
var $getClass = $this.attr("class").split(' ');
var $whichNumber = $getClass[0].substr(-1);
var $Parent = '.color-container-1 ';
pass = 1;
$($colorContent).fadeOut(0);
$($colorContent + '-' + $whichNumber).fadeIn(animationSpeed);
var reset = setTimeout(function() {
clearTimeout(reset);
pass = 0;
color1();
}, 10000);
}
var colorInterval = setInterval(function() {
if (pass > 0) {
clearInterval(colorInterval);
return; //stop here so that it doesn't continue to execute below code
}
$($colorContent).fadeOut(0);
$(($colorContent + '-' + counter)).fadeIn(animationSpeed);
++counter
if (counter === $($colorContent).length + 1) {
counter = 1;
}
}, 7000);
}

You could just clear the interval inside of the click event.
var colorInterval;
$($li).on('click', function() {
clearInterval(colorInterval);
colorClick($(this));
});
//Your other code
colorInterval = setInterval(function() {
//Rest of your code
});

One thing play with is jQuery animations have a pseudo class selector :animated when animation is in progress
if(!$('.your-slide-class:animated').length){
// do next animation
}

How do I make elements trigger to appear one after another, with a small interval?

I have a series of four elements. The first of which (#pro1) will appear on scrolling to a particular point on the page (this currently works), and the following three will trigger to appear one after another, with a small changeable interval in between each.
Any help would be greatly appreciated! A huge thank you in advance!
Here is the code for the first element, just needing to make the others appear after this one appears (#pro2, #pro3, #pro4, etc)
<script>
$(window).one("scroll", function() {
$('#pro1').each(function () {
var topOfWindow = $(window).scrollTop(),
bottomOfWindow = topOfWindow + $(window).height();
var imagePos = $(this).offset().top;
if(imagePos < bottomOfWindow-200 && imagePos >= topOfWindow-500){
$(this).addClass('bigEntrance2');
}else{
$(this).removeClass('bigEntrance2');
}
});
});
</script>

The key is using setInterval to call repeatedly the function that will create (or show if they are already created) the next elements.
It is important to not forget to clear the interval when the job is done.
Without the html and the css is difficult to realise exactly what you want to achieve, but from the next example you shouldn't have problems to update yours.
var interval = null;
var elementId = 1;
var numElements = 4;
var delay = 1000; //ms
$(document).ready(function()
{
//your first "pro1" element show up
var element = "<div>Im the pro" + elementId + " element!</div>";
$('body').append(element);
//in that moment we set the interval
interval = setInterval(show_next_element, delay);
});
function show_next_element()
{
//increment the counter elementId
elementId++;
//create the next element
var element = "<div>Im the pro" + elementId + " element!</div>";
//add it to the DOM
$('body').append(element);
//when our last element is created we clear the interval
if(elementId >= numElements)
clearInterval(interval);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Hope it helps!

Converting a JavaScript Countdown to a jQuery Countdown and adding an Interval

I found this JS-Countdown Script at JSFiddle.
EDIT:
I'm using the code of rafaelcastrocouto now, which is nearly perfect. I wanted a 10-seconds JQuery Countdown-Script with an interval that resets the countdown timer at 5 seconds and starts over again and again, but only for a specific class with a specific id on the whole HTML page. If it drops to 0, the countdown should stop. Also I want to reset specific counters to 10.
It's about a WebSocket that refreshes every second and depending on the data I get for specific counters I want to reset them or they should count down to zero.
New JSFiddle: http://jsfiddle.net/alexiovay/azkdry0w/4/

This is how I solved with jquery and native setInterval...
var setup = function(){
$('.count').each(eachSetup);
};
var eachSetup = function(){
var count = $(this);
var sec = count.data('seconds') ;
count.data('count', sec);
};
var everySecond = function(){
$('.count').each(eachCount);
};
var eachCount = function(){
var count = $(this);
var s = count.data('count');
count.text(s);
s--;
if(s < 0) {
s = count.data('seconds');
}
count.data('count', s);
};
setup();
setInterval(everySecond, 1000);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<p class="count" data-seconds="5"></p>
<p class="count" data-seconds="10"></p>
<p class="count" data-seconds="15"></p>

You have sever errors in code, e.g.
setTimeout(cd_go(id), 1000); - should point to function reference not to function execution. setTimeout also returns the timeout id. You must past that id to clearTimeout
clearTimeout(this); it should take id instead of global object (window) or undefined if you are working in strict mode
loop = setInterval(function(id) { … } - id points to undefinded as you are not passing any value for it

setInterval() not working after clearInterval() in this Javascript code

I have been ripping my hair off a couple of nights now with this problem:
I'm trying to create an expanding div with JavaScript. Here's the part of the HTML file:
<div id="bbc_div" class="bbc_div" style="display:none; height:200px;">
<input type="button" value="Show BBC" id="bbc_button" onclick="onclickBBC('bbc_div')" />
And here's the magical non-working JavaScript file:
var maxHeight = 100;
var curHeight = 1;
var wait = 5;
var timerID = new Array();
function onclickBBC(obj) {
if (document.getElementById(obj).style.display == "none") {
slideDown(obj);
}
else {
document.getElementById(obj).style.display="none"
}
}
function slideDown(obj) {
document.getElementById(obj).style.height="1px";
document.getElementById(obj).style.display="block";
timerID[obj] = setInterval("slideDownExec(\"" + obj + "\")", wait);
return;
}
function slideDownExec(obj) {
if (curHeight <= maxHeight) {
curHeight++;
document.getElementById(obj).style.height=curHeight + "px";
}
else {
endSlide(obj);
}
return;
}
function endSlide(obj) {
clearInterval(timerID[obj]);
return;
}
When I reload the page, div expands once to its right height. But, if I push the button without reloading page again after it has hided again, it doesn't work. display:block; works, but setInterval() isn't starting. So this happens after clearInterval() has executed. Why is clearInterval() killing my setInterval() permanently?

The timer is running, you just need to reset a variable:
function slideDown(obj)
{
document.getElementById(obj).style.height = "1px";
curHeight = 1;
I would use jQuery for this, it's a LOT easier.

You have an issue with curHeight not being set to 1 at the top of slideDown. If this doesn't happen, the if statement at the top of slideDownExec will only work the first time.
Additionally, does JavaScript allow non-integer array indexes?
> a['i'] = 4
4
> a
[]
> a['i']
4
What you're actually doing is adding a property called i to the array object. You might as well use an empty object rather than an array.