django1/media/js/SelectFilter.js

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JavaScript
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/*
SelectFilter - Turns a multiple-select box into a filter interface.
Requires SelectBox.js and addevent.js.
*/
function findForm(node) {
// returns the node of the form containing the given node
if (node.tagName.toLowerCase() != 'form') {
return findForm(node.parentNode);
}
return node;
}
var SelectFilter = {
init: function(field_id) {
var from_box = document.getElementById(field_id);
from_box.id += '_from'; // change its ID
// Create the INPUT input box
var input_box = document.createElement('input');
input_box.id = field_id + '_input';
input_box.setAttribute('type', 'text');
from_box.parentNode.insertBefore(input_box, from_box);
from_box.parentNode.insertBefore(document.createElement('br'), input_box.nextSibling);
// Create the TO box
var to_box = document.createElement('select');
to_box.id = field_id + '_to';
to_box.setAttribute('multiple', 'multiple');
to_box.setAttribute('size', from_box.size);
from_box.parentNode.insertBefore(to_box, from_box.nextSibling);
to_box.setAttribute('name', from_box.getAttribute('name'));
from_box.setAttribute('name', from_box.getAttribute('name') + '_old');
// Give the filters a CSS hook
from_box.setAttribute('class', 'filtered');
to_box.setAttribute('class', 'filtered');
// Set up the JavaScript event handlers for the select box filter interface
addEvent(input_box, 'keyup', function(e) { SelectFilter.filter_key_up(e, field_id); });
addEvent(input_box, 'keydown', function(e) { SelectFilter.filter_key_down(e, field_id); });
addEvent(from_box, 'dblclick', function() { SelectBox.move(field_id + '_from', field_id + '_to'); });
addEvent(from_box, 'focus', function() { input_box.focus(); });
addEvent(to_box, 'dblclick', function() { SelectBox.move(field_id + '_to', field_id + '_from'); });
addEvent(findForm(from_box), 'submit', function() { SelectBox.select_all(field_id + '_to'); });
SelectBox.init(field_id + '_from');
SelectBox.init(field_id + '_to');
// Move selected from_box options to to_box
SelectBox.move(field_id + '_from', field_id + '_to');
},
filter_key_up: function(event, field_id) {
from = document.getElementById(field_id + '_from');
// don't submit form if user pressed Enter
if ((event.which && event.which == 13) || (event.keyCode && event.keyCode == 13)) {
from.selectedIndex = 0;
SelectBox.move(field_id + '_from', field_id + '_to');
from.selectedIndex = 0;
return false;
}
var temp = from.selectedIndex;
SelectBox.filter(field_id + '_from', document.getElementById(field_id + '_input').value);
from.selectedIndex = temp;
return true;
},
filter_key_down: function(event, field_id) {
from = document.getElementById(field_id + '_from');
// right arrow -- move across
if ((event.which && event.which == 39) || (event.keyCode && event.keyCode == 39)) {
var old_index = from.selectedIndex;
SelectBox.move(field_id + '_from', field_id + '_to');
from.selectedIndex = (old_index == from.length) ? from.length - 1 : old_index;
return false;
}
// down arrow -- wrap around
if ((event.which && event.which == 40) || (event.keyCode && event.keyCode == 40)) {
from.selectedIndex = (from.length == from.selectedIndex + 1) ? 0 : from.selectedIndex + 1;
}
// up arrow -- wrap around
if ((event.which && event.which == 38) || (event.keyCode && event.keyCode == 38)) {
from.selectedIndex = (from.selectedIndex == 0) ? from.length - 1 : from.selectedIndex - 1;
}
return true;
}
}