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1 /*
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2 SelectFilter - Turns a multiple-select box into a filter interface.
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3
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4 Requires SelectBox.js and addevent.js.
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5 */
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6
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7 function findForm(node) {
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8 // returns the node of the form containing the given node
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9 if (node.tagName.toLowerCase() != 'form') {
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10 return findForm(node.parentNode);
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11 }
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12 return node;
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13 }
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14
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15 var SelectFilter = {
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16 init: function(field_id) {
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17 var from_box = document.getElementById(field_id);
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18 from_box.id += '_from'; // change its ID
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19 // Create the INPUT input box
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20 var input_box = document.createElement('input');
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21 input_box.id = field_id + '_input';
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22 input_box.setAttribute('type', 'text');
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23 from_box.parentNode.insertBefore(input_box, from_box);
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24 from_box.parentNode.insertBefore(document.createElement('br'), input_box.nextSibling);
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25 // Create the TO box
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26 var to_box = document.createElement('select');
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27 to_box.id = field_id + '_to';
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28 to_box.setAttribute('multiple', 'multiple');
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29 to_box.setAttribute('size', from_box.size);
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30 from_box.parentNode.insertBefore(to_box, from_box.nextSibling);
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31 to_box.setAttribute('name', from_box.getAttribute('name'));
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32 from_box.setAttribute('name', from_box.getAttribute('name') + '_old');
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33 // Give the filters a CSS hook
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34 from_box.setAttribute('class', 'filtered');
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35 to_box.setAttribute('class', 'filtered');
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36 // Set up the JavaScript event handlers for the select box filter interface
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37 addEvent(input_box, 'keyup', function(e) { SelectFilter.filter_key_up(e, field_id); });
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38 addEvent(input_box, 'keydown', function(e) { SelectFilter.filter_key_down(e, field_id); });
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39 addEvent(from_box, 'dblclick', function() { SelectBox.move(field_id + '_from', field_id + '_to'); });
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40 addEvent(from_box, 'focus', function() { input_box.focus(); });
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41 addEvent(to_box, 'dblclick', function() { SelectBox.move(field_id + '_to', field_id + '_from'); });
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42 addEvent(findForm(from_box), 'submit', function() { SelectBox.select_all(field_id + '_to'); });
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43 SelectBox.init(field_id + '_from');
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44 SelectBox.init(field_id + '_to');
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45 // Move selected from_box options to to_box
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46 SelectBox.move(field_id + '_from', field_id + '_to');
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47 },
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48 filter_key_up: function(event, field_id) {
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49 from = document.getElementById(field_id + '_from');
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50 // don't submit form if user pressed Enter
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51 if ((event.which && event.which == 13) || (event.keyCode && event.keyCode == 13)) {
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52 from.selectedIndex = 0;
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53 SelectBox.move(field_id + '_from', field_id + '_to');
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54 from.selectedIndex = 0;
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55 return false;
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56 }
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57 var temp = from.selectedIndex;
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58 SelectBox.filter(field_id + '_from', document.getElementById(field_id + '_input').value);
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59 from.selectedIndex = temp;
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60 return true;
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61 },
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62 filter_key_down: function(event, field_id) {
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63 from = document.getElementById(field_id + '_from');
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64 // right arrow -- move across
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65 if ((event.which && event.which == 39) || (event.keyCode && event.keyCode == 39)) {
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66 var old_index = from.selectedIndex;
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67 SelectBox.move(field_id + '_from', field_id + '_to');
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68 from.selectedIndex = (old_index == from.length) ? from.length - 1 : old_index;
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69 return false;
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70 }
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71 // down arrow -- wrap around
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72 if ((event.which && event.which == 40) || (event.keyCode && event.keyCode == 40)) {
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73 from.selectedIndex = (from.length == from.selectedIndex + 1) ? 0 : from.selectedIndex + 1;
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74 }
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75 // up arrow -- wrap around
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76 if ((event.which && event.which == 38) || (event.keyCode && event.keyCode == 38)) {
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77 from.selectedIndex = (from.selectedIndex == 0) ? from.length - 1 : from.selectedIndex - 1;
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78 }
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79 return true;
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80 }
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81 }
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