Question

Previous and next function

Asked by: Eternal_Student

I am using the following script to enable scrolling content within a div:

http://www.koders.com/javascript/fid45DD5327A26DD132AD1A6C5850248160F41B6B9A.aspx?s=%22Bruno+Bornsztein%22#L2

The problem is the previous and next functions - when you come to the end of the scroll/div [or you are at the beginning] it will loop around but I actually want to disable the the previous and next buttons if this is the case.

Can anyone help me modify the following code:



next: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;
 
    this.moveTo(this.sections[nextIndex], this.scroller, { 
      duration: this.options.duration
    });
  },
	
  previous: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
    this.moveTo(this.sections[prevIndex], this.scroller, { 
      duration: this.options.duration
    });
  },
                                  
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Asked On
2009-04-22 at 02:49:57ID24344450
Topics

JavaScript

,

JScript

,

Dynamic HTML (DHTML)

Participating Experts
2
Points
250
Comments
5

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Answers

 

by: Eternal_StudentPosted on 2009-04-22 at 02:54:36ID: 24202889

Just to clarify - you should only be able to go "Next" if you are at the beginning of the scroll not "Previous" ... equally if you are at the end of the scroll/div you should only be able to go "Previous" and not "next"

If that makes sense?

 

by: sam2912Posted on 2009-04-22 at 19:18:10ID: 24211355

Hi, would like to see your page code with the buttons (prev/next)

 

by: wilq32Posted on 2009-04-24 at 07:33:59ID: 24225698

try this

next: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;
 
    if (nextIndex!=0) this.moveTo(this.sections[nextIndex], this.scroller, { 
      duration: this.options.duration
    });
  },
        
  previous: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
    if (prevIndex!=this.sections.length-1) this.moveTo(this.sections[prevIndex], this.scroller, { 
      duration: this.options.duration
    });
  },

                                              
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by: Eternal_StudentPosted on 2009-04-27 at 06:34:33ID: 24241463

Hi Wilg32,

That does the job, only I need to switch the images to show that they are disabled. At the minute I just have:

<div id="scroll-left"><a href="#" onClick="my_glider.previous();return false;"><img src="files/images/arrow-left.jpg" alt="" /></a></div>

Is there a way to change that image when you cannot scroll any further and build that into the function in the JS file?


Thanks.

 

by: wilq32Posted on 2009-04-27 at 09:39:07ID: 24243404

add this function before

function changeButtonState(id, image) {
    document.getElementById(id).childNodes[1].src = image;
}




and use this code... If you dont understand something just ask. I assume that you have image as a second child in a ID-entified DIV 


    next: function() {
        if (this.current) {
            var currentIndex = this.current._index;
            var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;
        } else var nextIndex = 1;
        
        if (nextIndex != 0) {
            changeButtonState("scroll-left", "files/images/arrow-right.jpg");
            this.moveTo(this.sections[nextIndex], this.scroller, {
                duration: this.options.duration
            });
        } else {
            changeButtonState("scroll-left", "files/images/arrow-right-disabled.jpg");
            
        }
    },
    
    previous: function() {
        if (this.current) {
            var currentIndex = this.current._index;
            var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : currentIndex - 1;
        } else var prevIndex = this.sections.length - 1;
        
        if (prevIndex != this.sections.length - 1) {
            changeButtonState("scroll-left", "files/images/arrow-left.jpg");
            this.moveTo(this.sections[prevIndex], this.scroller, {
                duration: this.options.duration
            });
        } else {
            changeButtonState("scroll-left", "files/images/arrow-left-disabled.jpg");
        }
    }
                                              
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