What is the best way to incorporate a jQuery progress bar into a slideshow gallery?

Question

What is the best way to incorporate a jQuery progress bar into a slideshow gallery?

My friend and I are working on enhancing our jQuery slideshow by adding a progress bar to show when the gallery will switch to the next image. Here is the code for our slideshow that we have written so far. We would greatly appreciate any help or suggestions. Thank you!

/* Our JavaScript Code */

$('.ppt li:gt(0)').hide();
$('.ppt li:last').addClass('last');
$('.ppt li:first').addClass('first');
$('#play').hide();

var current = $('.ppt li:first');
var interval;

$('#fwd').click( function() {
    moveForward();
    displayPause();
} );

$('#back').click( function() {
    moveBackward();
    displayPause();
} );

$('#stop').click( function() {
    stopSlideshow();
    displayPlay();
} );

$('#play').click( function() {
    startSlideshow();
    displayPause();
} );

function moveForward() {
    stopSlideshow();
    forwardImage();
    startSlideshow();
}

function moveBackward() {
    stopSlideshow();
    backwardImage();
    startSlideshow();
}

function backwardImage() {
    current.fadeOut( 1000 );
    if ( current.attr('class') == 'first' )
        current = $('.ppt li:last');
    else
        current = current.prev();
    current.fadeIn( 1000 );
}

function forwardImage() {
    current.fadeOut( 1000 );
    if ( current.attr('class') == 'last' )
        current = $('.ppt li:first');
    else
        current = current.next();
    current.fadeIn( 1000 );
}

function displayPause() {
    $('#play').hide();
    $('#stop').show();
}

function displayPlay() {
    $('#stop').hide();
    $('#play').show();
}

function startSlideshow() {
    interval = setInterval( "forwardImage()", 5000 );
}

function stopSlideshow() {
    clearInterval( interval );
}

$(function() {
    startSlideshow();
} );

/* The HTML Structure */

        <ul class="ppt">
            <li><img src="images/show_1_banner.jpg"></img></li>
            <li><img src="images/show_2_banner.jpg"></img></li>
        </ul>
        <div id="buttons">
            <button type="button" id="back" title="Previous"></button>
            <button type="button" id="stop" title="Stop"></button>
            <button type="button" id="play" title="Play"></button>
            <button type="button" id="fwd" title="Next"></button>
        </div>

/* Custom CSS Styling */

ul.ppt {position: relative;}

.ppt li {
    position: absolute;
    width:770px;
    height:460px;
}

.ppt img {
    width:750px;
    height:440px;
    margin:0 auto;
    display:block;
    margin-top:10px;
}

javascript jquery html css progress-bar

Answer 1

Answer №1

http://jsfiddle.net/loktar/AASYC/3/

I made some modifications to the original JavaScript code in order to demonstrate a potential approach for achieving a certain effect. While there are likely more efficient ways to handle passing options, my primary focus was on adjusting the forward function to execute every second. Within this function, it compares the current running time with a specified threshold for changing the image. If the condition is met, the image is swapped; otherwise, a progress bar reflects the percentage of time elapsed.

You have the flexibility to input a starting time in milliseconds, like 8000, or leave it blank for the default value of 5000. By reviewing the code, you should be able to grasp how this functionality can be implemented. To enhance the transition's smoothness and speed, consider animating the width adjustment or shortening the interval below 1000.

Key Modifications:

var interval,
    timeStep = 5000,
    lastTime = (new Date()).getTime();    

function forward() {
    var curTime = (new Date()).getTime() - lastTime;
    if(curTime > timeStep){ 
        lastTime = (new Date()).getTime();
        cur.fadeOut( 1000 );
        if ( cur.attr('class') == 'last' )
            cur = $('.ppt li:first');
        else
            cur = cur.next();
            cur.fadeIn( 1000 );
    }else{
        $("#progress").width(curTime/timeStep * 100 + "%");  
    }
}

interval = setInterval( function(){forward();}, 1000);

Answer 2

http://jsfiddle.net/loktar/AASYC/3/

I made some modifications to the original JavaScript code in order to demonstrate a potential approach for achieving a certain effect. While there are likely more efficient ways to handle passing options, my primary focus was on adjusting the forward function to execute every second. Within this function, it compares the current running time with a specified threshold for changing the image. If the condition is met, the image is swapped; otherwise, a progress bar reflects the percentage of time elapsed.

You have the flexibility to input a starting time in milliseconds, like 8000, or leave it blank for the default value of 5000. By reviewing the code, you should be able to grasp how this functionality can be implemented. To enhance the transition's smoothness and speed, consider animating the width adjustment or shortening the interval below 1000.

Key Modifications:

var interval,
    timeStep = 5000,
    lastTime = (new Date()).getTime();    

function forward() {
    var curTime = (new Date()).getTime() - lastTime;
    if(curTime > timeStep){ 
        lastTime = (new Date()).getTime();
        cur.fadeOut( 1000 );
        if ( cur.attr('class') == 'last' )
            cur = $('.ppt li:first');
        else
            cur = cur.next();
            cur.fadeIn( 1000 );
    }else{
        $("#progress").width(curTime/timeStep * 100 + "%");  
    }
}

interval = setInterval( function(){forward();}, 1000);

Answer 3

Answer №2

In a similar fashion to Loktar's solution, I've previously tackled a task with a method like this:

function moveForward() {

  // ...
  $("#progress").animate({width:'100%'}, settings.interval);
  // ...

}

This function takes care of the sequential progression for you. It operates asynchronously, allowing you to simply call it and move on. You might want to include a

$("#progress").stop().css({width:'0px'});

line within your advance() function to reset the progress bar. This precaution ensures you stay in sync with the image transitions. Experiment with the timing until it feels just right.

Of course, remember to substitute settings.interval with the time interval in milliseconds between each image change. For your particular scenario, I suggest using 4900, considering other tasks like loading high-resolution images may require additional processing time. A delay of less than a hundred milliseconds is likely imperceptible to the human eye.

Answer 4

In a similar fashion to Loktar's solution, I've previously tackled a task with a method like this:

function moveForward() {

  // ...
  $("#progress").animate({width:'100%'}, settings.interval);
  // ...

}

This function takes care of the sequential progression for you. It operates asynchronously, allowing you to simply call it and move on. You might want to include a

$("#progress").stop().css({width:'0px'});

line within your advance() function to reset the progress bar. This precaution ensures you stay in sync with the image transitions. Experiment with the timing until it feels just right.

Of course, remember to substitute settings.interval with the time interval in milliseconds between each image change. For your particular scenario, I suggest using 4900, considering other tasks like loading high-resolution images may require additional processing time. A delay of less than a hundred milliseconds is likely imperceptible to the human eye.

Answer 5

Answer №3

After incorporating sholsingers sample into Loktar's example, the updated result can be viewed here: http://jsfiddle.net/AASYC/85/

$('.ppt li:gt(0)').hide();
$('.ppt li:last').addClass('last');
$('.ppt li:first').addClass('first');
$('#play').hide();

var cur = $('.ppt li:first');
var interval, progressInterval,
timeStep = 5000,
lastTime = (new Date()).getTime();

$('#fwd').click( function() {
goFwd();
//showPause();
});

$('#back').click( function() {
    goBack();
    //showPause();
} );

$('#stop').click( function() {
   stop();
   showPlay();
} );

$('#play').click( function() {
start();
showPause();
} );

function goFwd() {
    stop();
    forward();
    start();

}

function goBack() {
    stop();
    back();
    start();

}

function back() {
   cur.fadeOut(1000);
    if (cur.attr('class') == 'first')
     cur = $('.ppt li:last');
    else
      cur = cur.prev();
    cur.fadeIn(1000);
    $("#progress").stop().css({width:'0px'});
}

function forward() {
    cur.fadeOut(1000);
    if (cur.attr('class') == 'last')
        cur = $('.ppt li:first');
    else
        cur = cur.next();
    cur.fadeIn(1000);
    $("#progress").stop().css({width:'0px'});
}

function startSlideShow() {
var curTime = (new Date()).getTime() - lastTime;

 if(curTime > timeStep)
 {
    lastTime = (new Date()).getTime();
    $("#progress").stop().css({width:'0px'});
    cur.fadeOut(1000);
    if ( cur.attr('class') == 'last' )
        cur = $('.ppt li:first');
    else
        cur = cur.next();

    cur.fadeIn(1000);
}
else
{
    if($("#progress:animated").length < 1)
    {
        $("#progress").animate({width: "100%"}, 4900);
    }                        
}
}


function showPause() {
$('#play').hide();
$('#stop').show();
}

function showPlay() {
$('#stop').hide();
$('#play').show();
}

function start(changeInterval) {
if(changeInterval){
    timeStep = changeInterval;
}
interval = setInterval( function(){ startSlideShow();}, 500);
}

function stop() {
$("#progress").stop().css({width:'0px'});
clearInterval( interval );
lastTime = (new Date()).getTime();
}

$(function() {
    start();
} );

Answer 6

After incorporating sholsingers sample into Loktar's example, the updated result can be viewed here: http://jsfiddle.net/AASYC/85/

$('.ppt li:gt(0)').hide();
$('.ppt li:last').addClass('last');
$('.ppt li:first').addClass('first');
$('#play').hide();

var cur = $('.ppt li:first');
var interval, progressInterval,
timeStep = 5000,
lastTime = (new Date()).getTime();

$('#fwd').click( function() {
goFwd();
//showPause();
});

$('#back').click( function() {
    goBack();
    //showPause();
} );

$('#stop').click( function() {
   stop();
   showPlay();
} );

$('#play').click( function() {
start();
showPause();
} );

function goFwd() {
    stop();
    forward();
    start();

}

function goBack() {
    stop();
    back();
    start();

}

function back() {
   cur.fadeOut(1000);
    if (cur.attr('class') == 'first')
     cur = $('.ppt li:last');
    else
      cur = cur.prev();
    cur.fadeIn(1000);
    $("#progress").stop().css({width:'0px'});
}

function forward() {
    cur.fadeOut(1000);
    if (cur.attr('class') == 'last')
        cur = $('.ppt li:first');
    else
        cur = cur.next();
    cur.fadeIn(1000);
    $("#progress").stop().css({width:'0px'});
}

function startSlideShow() {
var curTime = (new Date()).getTime() - lastTime;

 if(curTime > timeStep)
 {
    lastTime = (new Date()).getTime();
    $("#progress").stop().css({width:'0px'});
    cur.fadeOut(1000);
    if ( cur.attr('class') == 'last' )
        cur = $('.ppt li:first');
    else
        cur = cur.next();

    cur.fadeIn(1000);
}
else
{
    if($("#progress:animated").length < 1)
    {
        $("#progress").animate({width: "100%"}, 4900);
    }                        
}
}


function showPause() {
$('#play').hide();
$('#stop').show();
}

function showPlay() {
$('#stop').hide();
$('#play').show();
}

function start(changeInterval) {
if(changeInterval){
    timeStep = changeInterval;
}
interval = setInterval( function(){ startSlideShow();}, 500);
}

function stop() {
$("#progress").stop().css({width:'0px'});
clearInterval( interval );
lastTime = (new Date()).getTime();
}

$(function() {
    start();
} );

What is the best way to incorporate a jQuery progress bar into a slideshow gallery?

Answer №1

Answer №2

Answer №3

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