// $Id: tableselect.js,v 1.8 2007/11/19 12:15:16 goba Exp $

Drupal.behaviors.tableSelect = function (context) {

  $('form table:has(th.select-all):not(.tableSelect-processed)', context).each(Drupal.tableSelect);

};

Drupal.tableSelect = function() {

  // Do not add a "Select all" checkbox if there are no rows with checkboxes in the table

  if ($('td input:checkbox', this).size() == 0) {

    return;

  }

  // Keep track of the table, which checkbox is checked and alias the settings.

  var table = this, checkboxes, lastChecked;

  var strings = { 'selectAll': Drupal.t('Select all rows in this table'), 'selectNone': Drupal.t('Deselect all rows in this table') };

  var updateSelectAll = function(state) {

    $('th.select-all input:checkbox', table).each(function() {

      $(this).attr('title', state ? strings.selectNone : strings.selectAll);

      this.checked = state;

    });

  };

  // Find all <th> with class select-all, and insert the check all checkbox.

  $('th.select-all', table).prepend($('<input type="checkbox" class="form-checkbox" />').attr('title', strings.selectAll)).click(function(event) {

    if ($(event.target).is('input:checkbox')) {

      // Loop through all checkboxes and set their state to the select all checkbox' state.

      checkboxes.each(function() {

        this.checked = event.target.checked;

        // Either add or remove the selected class based on the state of the check all checkbox.

        $(this).parents('tr:first')[ this.checked ? 'addClass' : 'removeClass' ]('selected');

      });

      // Update the title and the state of the check all box.

      updateSelectAll(event.target.checked);

    }

  });

  // For each of the checkboxes within the table.

  checkboxes = $('td input:checkbox', table).click(function(e) {

    // Either add or remove the selected class based on the state of the check all checkbox.

    $(this).parents('tr:first')[ this.checked ? 'addClass' : 'removeClass' ]('selected');

    // If this is a shift click, we need to highlight everything in the range.

    // Also make sure that we are actually checking checkboxes over a range and

    // that a checkbox has been checked or unchecked before.

    if (e.shiftKey && lastChecked && lastChecked != e.target) {

      // We use the checkbox's parent TR to do our range searching.

      Drupal.tableSelectRange($(e.target).parents('tr')[0], $(lastChecked).parents('tr')[0], e.target.checked);

    }

    // If all checkboxes are checked, make sure the select-all one is checked too, otherwise keep unchecked.

    updateSelectAll((checkboxes.length == $(checkboxes).filter(':checked').length));

    // Keep track of the last checked checkbox.

    lastChecked = e.target;

  });

  $(this).addClass('tableSelect-processed');

};

Drupal.tableSelectRange = function(from, to, state) {

  // We determine the looping mode based on the the order of from and to.

  var mode = from.rowIndex > to.rowIndex ? 'previousSibling' : 'nextSibling';

  // Traverse through the sibling nodes.

  for (var i = from[mode]; i; i = i[mode]) {

    // Make sure that we're only dealing with elements.

    if (i.nodeType != 1) {

      continue;

    }

    // Either add or remove the selected class based on the state of the target checkbox.

    $(i)[ state ? 'addClass' : 'removeClass' ]('selected');

    $('input:checkbox', i).each(function() {

      this.checked = state;

    });

    if (to.nodeType) {

      // If we are at the end of the range, stop.

      if (i == to) {

        break;

      }

    }

    // A faster alternative to doing $(i).filter(to).length.

    else if (jQuery.filter(to, [i]).r.length) {

      break;

    }

  }

};