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janmd2014

Continous scroll on keyhold

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Hi,

 

Can I use greensock for continuous scroll upon keypress + hold

 

Let say I want a page to scroll continuously arrow key down is pressed and stop when release

 

I also checked the doc and faq section and I can't find instruction how to start using gsap. Do you have documentation on getting started?

 

Thanks

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Hi janmd2014 :)

 

try something like this :

function Loop() {
TweenMax.to(window, 0.5, {scrollTo:{y:"+=20",ease:Linear.easeNone}});
TweenMax.delayedCall(0.5,Loop);   
}
$( ".btn" ).mousedown(function() { Loop() });
$( ".btn" ).mouseup(function() { TweenMax.killDelayedCallsTo(Loop) });

pls check these links too :

 

http://greensock.com/docs/#/HTML5/GSAP/TweenMax/delayedCall/

http://greensock.com/docs/#/HTML5/GSAP/TweenMax/killDelayedCallsTo/

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Hi Janmd2014,

 

Sorry, you had trouble finding the right materials. For future reference, our tutorials are in the Learning section (see top navigation).

We have an extensive Getting Started Guide and our Jump Start (interactive slideshow of demos) for beginners.

 

However, we have long felt that these resources are not enough.

 

Your timing could not have been any better, as just last night we released a video to show people how to get up and running quickly! The video is fast-paced and hits on all the info you need to know starting out.

 

Take a look here: http://greensock.com/get-started-js

 

If you have any feedback on the video, or other topics you would like covered, please let us know.

 

Happy Tweening!

 

- Carl

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Hi janmd2014  :)

 

try something like this :

function Loop() {
TweenMax.to(window, 0.5, {scrollTo:{y:"+=20",ease:Linear.easeNone}});
TweenMax.delayedCall(0.5,Loop);   
}
$( ".btn" ).mousedown(function() { Loop() });
$( ".btn" ).mouseup(function() { TweenMax.killDelayedCallsTo(Loop) });

pls check these links too :

 

http://greensock.com/docs/#/HTML5/GSAP/TweenMax/delayedCall/

http://greensock.com/docs/#/HTML5/GSAP/TweenMax/killDelayedCallsTo/

 

 

Is it possible to put variables inside scrollto?

 

TweenMax.to(window, 0.5, {scrollTo:{y:"+=VariableSpeed",ease:Linear.easeNone}});

 

Thanks

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Hi Janmd2014,

 

Sorry, you had trouble finding the right materials. For future reference, our tutorials are in the Learning section (see top navigation).

We have an extensive Getting Started Guide and our Jump Start (interactive slideshow of demos) for beginners.

 

However, we have long felt that these resources are not enough.

 

Your timing could not have been any better, as just last night we released a video to show people how to get up and running quickly! The video is fast-paced and hits on all the info you need to know starting out.

 

Take a look here: http://greensock.com/get-started-js

 

If you have any feedback on the video, or other topics you would like covered, please let us know.

 

Happy Tweening!

 

- Carl

 

Thanks! and sorry for missing the menu on the topmost. I was focussing on the Support menu. I was expecting every docs/tutorials would be there and I concluded there isn't getting started docs when i did not saw it there.

 

Thanks

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yep , try this :

var myVar = 50 ; // you can define negative value like -50
function Loop() {
TweenMax.to(window, 0.5, {scrollTo:{ y:"+="+myVar , ease:Linear.easeNone }});
TweenMax.delayedCall(0.5,Loop);   
}
$( ".btn" ).mousedown(function() { Loop() });
$( ".btn" ).mouseup(function() { TweenMax.killDelayedCallsTo(Loop) });
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Hi Janmd2014,

 

A delayed call might result in some jumping, so here's another way to go about this. Create a tween when a key is first pressed, and set its time based on its scroll position. While the key is being held down, ignore any more calls to create the tween. When the key is released, kill the tween. You can even add in some easing for acceleration. The longer you hold the key down, the faster it will scroll.

 

Use the UP and DOWN keys to auto scroll

http://plnkr.co/edit/TAmtkT?p=preview

 

EDIT: I removed the Polymer scripts that were causing it not to work in Firefox and IE.

 

CodePen URL: 

See the Pen emEajW by osublake (@osublake) on CodePen

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Hmmm , if you don't like to use delayedCall , you can try something like this :

var T=1 , SCT , SCS , DU=DD=DO= 2 ; // 2 = Scroll Duration
//////////////////////////////////// btn & keyboard setup        
$("#down").mousedown(function() { Down(); });
$("#up").mousedown(function() { Up(); });
$("#down,#up").mouseup(function() { Stop(); });
$(window).keydown(function( event ) {
  if ( event.which == 40 ) { event.preventDefault();   Down(); } 
  else if ( event.which == 38 ) { event.preventDefault();   Up(); }
});
$(window).keyup(function() { Stop(); });
////////////////////////////////////
function Up(){
  TweenMax.killTweensOf(SCT);
  if(T){  SCT = TweenMax.to(window,DD,{scrollTo:0,ease:Linear.easeNone}); T=0;  }
};
function Down(){
  TweenMax.killTweensOf(SCT);
  if(T){  SCT = TweenMax.to(window,DU,{scrollTo:'max',ease:Linear.easeNone}); T=0;  }
};
function Stop(){
  SCS = TweenLite.to(SCT,0.3,{timeScale:0,onComplete:function(){ SCT.pause(); Scalc(); T=1; }}) 
};
function Scalc(){
var ST = $(window).scrollTop();
var DH = $(document).height();
var WH = $(window).height();
var scrollPercent = (ST)/(DH-WH);
DD  = DO-(DO*(1-scrollPercent));
DU  = DO-(DO*(scrollPercent)); 
};
 

pls check this out : 

See the Pen NPvZxR by MAW (@MAW) on CodePen

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Nice! That works much better than the delayed call. Love the background too.

 

See if you can figure out my easeInOut problem. It works fine when you scroll a long distance, but if you're near the top and press up, or near the bottom and press down, it scrolls too fast. I need to figure out some sort of ratio to slow it down based on distance.

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One quick question...

 

When I saw $function() in the code, that means jQuery is being used?

 

I am trying not to use jQuery and I know gsock also recommend not to use jquery plugin.

 

Am I wrong?

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@OSUblake @Diaco.AW

 

Thanks both for your help.

 

So far I am satisfied with what I came up with. I am not an advance coder. Your codes seems out of my league but I would really like to try it sometime.

 

One question though.

 

Here is what I get so far.

http://demo.starpixel.net/gsock/

 

It can be scroll by up and down. Ctrl+up or down for faster scroll, and number pad with different speed depending on which number is pressed. Number pad scroll direction is based on the last direction made by arrow keys.

 

So far this is smoother than my current version which is the one I intend to replace with gsock animation. Here is the jquery (current) version

http://prompter.rareapps.org/prompter.php?p=123

 

As you can see, gsock is much smoother but it is still having the jaggy part sometimes. Perhaps due to the delayCall

 

Here is my gsock code

function LoopUp() {
	TweenMax.to(window, 0.7, {scrollTo:{y:"+=20",ease:Linear.easeNone}});
	TweenMax.delayedCall(0.2,LoopUp);   
}

On both of your code however, It is hard to tell if it smooth or not because of the speed.

 

If you both have time I want to see if my current version can still be improved using your code or it is the smoothest I can achieve. Perhaps you can change your sample using the same scenario as what I have just for comparative and educational purpose.

 

I am happy with my current gsock version. Thanks to both of you.

 

Kudos

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Hi again janmd2014  :)

 

-  $function() :  It is the same as writing this : $(document).ready(function(){});

  http://api.jquery.com/ready/

 

- we'r both using GSAP engine in our codes , so you have to just adjust codes (duration) on your project and both codes will works perfectly smooth .

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Hi Janmd,

 

Our examples are doing the same thing, the only real difference is Diaco's example is listening for mouse events, which fire once. In my example, I'm listening for keydown events which constantly fire, so I added in some basic logic to prevent it from recreating a new animation every time it fires. 

 

jQuery is not needed for anything related to GSAP. We only used it to find the document height, window height, window scrollTop, and mouse/keyboard events. Nothing special. 

 

Here's another version that you can play around with to make a comparison. Instead of using some arbitrary total/scroll time value, you can enter a speed value for how many pixels you want it to scroll per second. I also added in a timeScale value, which will increase the speed when you press or release the CTRL button. Using timeScale would be a good way to create the different speeds for you num pad buttons.

 

See the Pen myMNNL by osublake (@osublake) on CodePen

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WOW!

 

That is amazing. I will surely migrate my jQuery version to that if I have time. That is amazingly smooth scroll! Even from the speed of 50, the pixels are moving in elegantly smooth tween. Great great great!

 

Are you deleting your samples in codepen? I would love to come back on that some other time.

 

Really.. that is amazingly smooth!

 

Great!

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I don't delete my pens, but you should probably signup for a CodePen account if you haven't already. Having an account will allow you to fork anything you like. All you have to do is click the fork button and it will create a copy for you.

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Hi @OSUblake,

 

I'm trying to implement your pen on my site but I get 200 errors on twinmax

 

http://prompter.rareapps.org/wp-content/themes/child-theme/prompter2.php

 

Error: Uncaught TypeError: Failed to execute 'scrollTo' on 'Window': 2 arguments required, but only 0 present.

 

I use this to include greensock

 

<!--CDN link for the latest TweenMax-->
 
What did I missed?
 
thanks
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pls load the ScrollTo Plugin too :

<script src="http://cdnjs.cloudflare.com/ajax/libs/gsap/1.15.1/plugins/ScrollToPlugin.min.js"></script>
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