jQuery pagination + Twitter Bootstrap

Question

I'm trying to modify a Jquery pagination (based on this Jquery pagination tutorial - demo) to work with the awesome twitter bootstrap.

Twitter Bootstrap's standard pagination setup looks like this, so this is the goal for the pagination output structure.

<div class="pagination">
    <ul>
        <li class="prev disabled"><a href="#">&larr; Previous</a></li>
        <li class="active"><a href="#">1</a></li>
        <li><a href="#">2</a></li>
        <li><a href="#">3</a></li>
        <li><a href="#">4</a></li>
        <li><a href="#">5</a></li>
        <li class="next"><a href="#">Next &rarr;</a></li>
    </ul>
</div>

So far I can get it to work by changing the html output structure but the active highlighting is not working proper since I changed the output from <a> to the <li> tag.

This is where I am stuck now ATM!

I still need to do the following:

• Disable prev button, when on first page
• Change Active <li> when page is changed
• Disable next button when on last page
• Fix the prev button so it works again
• fix the next button so it works again

Heres the link to the JsFiddle - somehow it's not working, but the code should be correct (same code as this)

Answer 1

Here is the standard jQuery.pagination library, which I have modified to use twitter bootstrap.

create div -

<div id="myPager" class="pagination"></div>

then

$('#myPager').pagination(100,{callback:function(page,component){
    console.info(page);
}})

and here is the code for library.

jQuery.fn.pagination = function(maxentries, opts){
    opts = jQuery.extend({
        items_per_page:10,
        num_display_entries:10,
        current_page:0,
        num_edge_entries:0,
        link_to:"javascript:void(0)",
        first_text:"First",
        last_text:"Last",
        prev_text:"Prev",
        next_text:"Next",
        ellipse_text:"...",
        prev_show_always:true,
        next_show_always:true,
        callback:function(){return false;}
    },opts||{});

    return this.each(function() {
        /**
         * Calculate the maximum number of pages
         */
        function numPages() {
            return Math.ceil(maxentries/opts.items_per_page);
        }

        /**
         * Calculate start and end point of pagination links depending on 
         * current_page and num_display_entries.
         * @return {Array}
         */
        function getInterval()  {
            var ne_half = Math.ceil(opts.num_display_entries/2);
            var np = numPages();
            var upper_limit = np-opts.num_display_entries;
            var start = current_page>ne_half?Math.max(Math.min(current_page-ne_half, upper_limit), 0):0;
            var end = current_page>ne_half?Math.min(current_page+ne_half, np):Math.min(opts.num_display_entries, np);
            return [start,end];
        }

        /**
         * This is the event handling function for the pagination links. 
         * @param {int} page_id The new page number
         */
        function pageSelected(page_id, evt){
            current_page = page_id;
            drawLinks();
            var continuePropagation = opts.callback(page_id, panel);
            if (!continuePropagation) {
                if (evt.stopPropagation) {
                    evt.stopPropagation();
                }
                else {
                    evt.cancelBubble = true;
                }
            }
            return continuePropagation;
        }

        /**
         * This function inserts the pagination links into the container element
         */
        function drawLinks() {
            panel.empty();
            var list = jQuery("<ul></ul>");
            panel.append(list);

            var interval = getInterval();
            var np = numPages();
            // This helper function returns a handler function that calls pageSelected with the right page_id
            var getClickHandler = function(page_id) {
                return function(evt){ return pageSelected(page_id,evt); }
            }
            // Helper function for generating a single link (or a span tag if it's the current page)
            var appendItem = function(page_id, appendopts){
                page_id = page_id<0?0:(page_id<np?page_id:np-1); // Normalize page id to sane value
                appendopts = jQuery.extend({text:page_id+1, classes:""}, appendopts||{});
                if(page_id == current_page){
                    var clazz = appendopts.side ? 'disabled' : 'active';
                    var lstItem = jQuery("<li class='"+clazz+"'><a>"+(appendopts.text)+"</a></li>")
                }
                else
                {
                    var a = jQuery("<a>"+(appendopts.text)+"</a>")
                        .attr('href', opts.link_to.replace(/__id__/,page_id));;
                    var lstItem = jQuery("<li></li>")
                        .bind("click", getClickHandler(page_id));
                    lstItem.append(a);
                }
                if(appendopts.classes){lstItem.addClass(appendopts.classes);}
                list.append(lstItem);
            }
            // Generate "Previous"-Link
            if(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
                appendItem(0, { text: opts.first_text, side: true });
                appendItem(current_page-1,{text:opts.prev_text, side:true});
            }
            // Generate starting points
            if (interval[0] > 0 && opts.num_edge_entries > 0)
            {
                var end = Math.min(opts.num_edge_entries, interval[0]);
                for(var i=0; i<end; i++) {
                    appendItem(i);
                }
                if(opts.num_edge_entries < interval[0] && opts.ellipse_text)
                {
                    jQuery("<li class='disabled'>"+opts.ellipse_text+"</li>").appendTo(list);
                }
            }
            // Generate interval links
            for(var i=interval[0]; i<interval[1]; i++) {
                appendItem(i);
            }
            // Generate ending points
            if (interval[1] < np && opts.num_edge_entries > 0)
            {
                if(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
                {
                    jQuery("<li class='disabled'>"+opts.ellipse_text+"</li>").appendTo(list);
                }
                var begin = Math.max(np-opts.num_edge_entries, interval[1]);
                for(var i=begin; i<np; i++) {
                    appendItem(i);
                }

            }
            // Generate "Next"-Link
            if(opts.next_text && (current_page < np-1 || opts.next_show_always)){
                appendItem(current_page+1,{text:opts.next_text, side:true});
                appendItem(np - 1, { text: opts.last_text, side: true });
            }
        }

        // Extract current_page from options
        var current_page = opts.current_page;
        // Create a sane value for maxentries and items_per_page
        maxentries = (!maxentries || maxentries < 0)?1:maxentries;
        opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
        // Store DOM element for easy access from all inner functions
        var panel = jQuery(this);
        // Attach control functions to the DOM element 
        this.selectPage = function(page_id){ pageSelected(page_id);}
        this.prevPage = function(){ 
            if (current_page > 0) {
                pageSelected(current_page - 1);
                return true;
            }
            else {
                return false;
            }
        }
        this.nextPage = function(){ 
            if(current_page < numPages()-1) {
                pageSelected(current_page+1);
                return true;
            }
            else {
                return false;
            }
        }
        // When all initialisation is done, draw the links
        drawLinks();
        // call callback function
        //opts.callback(current_page, this);
    });
}

Answer 2

Assign IDs dynamically to all <li> under #page_navigation, and add or remove the class active based on the IDs.

<script type="text/javascript">
$(document).ready(function(){

  //how much items per page to show
  var show_per_page = 5; 
  //getting the amount of elements inside content div
  var number_of_items = $('#content').children().size();
  //calculate the number of pages we are going to have
  var number_of_pages = Math.ceil(number_of_items/show_per_page);

  //set the value of our hidden input fields
  $('#current_page').val(0);
  $('#show_per_page').val(show_per_page);

  var navigation_html = '<ul>';

  navigation_html += '<li class="previous_link">';
  navigation_html += '<a href="javascript:previous();">&larr; Previous</a>';
  navigation_html += '</li>';
  var current_link = 0;
  while(number_of_pages > current_link){
    navigation_html += '<li class="page_link" id="id' + current_link +'">';
    navigation_html += '<a href="javascript:go_to_page(' + current_link +')" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>';
    current_link++;
    navigation_html += '</li>';
  }
  navigation_html += '<li>';
  navigation_html += '<a class="next_link" href="javascript:next();">Next &rarr;</a>';
  navigation_html += '</li>';
  navigation_html += '</ul>';

  $('#page_navigation').html(navigation_html);

  //add active class to the first page link
  $('#page_navigation .page_link:first').addClass('active');

  //hide all the elements inside content div
  $('#content').children().css('display', 'none');

  //and show the first n (show_per_page) elements
  $('#content').children().slice(0, show_per_page).css('display', 'block');

});

function previous(){

  new_page = parseInt($('#current_page').val()) - 1;
  //if there is an item before the current active link run the function
  if($('.active').prev('.page_link').length==true){
    go_to_page(new_page);
  }

}

function next(){
  new_page = parseInt($('#current_page').val()) + 1;
  //if there is an item after the current active link run the function
  if($('.active').next('.page_link').length==true){
    go_to_page(new_page);
  }

}

function go_to_page(page_num){
  //get the number of items shown per page
  var show_per_page = parseInt($('#show_per_page').val());

  //get the element number where to start the slice from
  start_from = page_num * show_per_page;

  //get the element number where to end the slice
  end_on = start_from + show_per_page;

  activate_id = page_num;
  var get_box = document.getElementById("id"+page_num);
  //hide all children elements of content div, get specific items and show them
  $('#content').children().css('display', 'none').slice(start_from, end_on).css('display', 'block');

  /*get the page link that has longdesc attribute of the current page and add active class to it
  and remove that class from previously active page link*/
  $("#page_navigation").find('li.active').removeClass("active");
  $(get_box).addClass("active");


  //update the current page input field
  $('#current_page').val(page_num);
}

</script>