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Convert select boxes with optgroup elements into multiple select boxes. Registers itself as an onReady handler.
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(function(jQuery) { | |
// adapted from the work of Chris Beaven https://gist.github.com/967775 | |
jQuery.fn.selectOptgroup = function(options) { | |
var settings = jQuery.extend({ | |
optSelect: '_options', | |
inBetween: '', | |
optBlank: null, | |
selectBlank: null, | |
keepOrphans: true, | |
showSpeed: 200 | |
}, options); | |
return this.each(function(){ | |
var select = jQuery(this); | |
var optSelectID = this.id + settings.optSelect; | |
var selectedOption = jQuery('option[selected]', select) | |
if (selectedOption.length) { | |
var selectedValue = selectedOption[0].value; | |
} else { | |
var selectedValue = null; | |
} | |
// Only if we have an id | |
if (!this.id) return; | |
// Only if the opt select id doesn't exist already | |
if (jQuery('#'+optSelectID).length) return; | |
jQuery(this).before('<select id="'+optSelectID+'"></select>'+settings.inBetween); | |
var optSelect = jQuery('#'+optSelectID); | |
jQuery('label[for="'+this.id+'"]').attr('for', optSelectID); | |
var optSelectSelected = null; | |
var orphansCount = 0; | |
if (settings.keepOrphans) { | |
var orphans = jQuery('> option', this).each(function(i){ | |
var option = jQuery(this).clone()[0]; | |
option.options = jQuery(this); | |
option.singleOption = true; | |
optSelect.append(option); | |
if (this.value == selectedValue && optSelectSelected == null) { | |
optSelectSelected = i; | |
} | |
}); | |
orphansCount = orphans.length; | |
} | |
jQuery('optgroup', this).each(function(i){ | |
var option = jQuery('<option>'+this.label+'</option>')[0]; | |
option.options = jQuery('option', this); | |
optSelect.append(option); | |
option.options.each(function() { | |
if (this.value == selectedValue && optSelectSelected == null) { | |
optSelectSelected = i + orphansCount; | |
} | |
}); | |
}); | |
optSelect.change(function(){ | |
var option = this.options[this.selectedIndex]; | |
select.empty().append(option.options); | |
if (settings.selectBlank != null && !option.singleOption) { | |
jQuery('<option value="">'+settings.selectBlank+'</option>').prependTo(select)[0].singleOption = true; | |
} | |
if (option.singleOption) { | |
select.hide() | |
} else { | |
select.show(settings.showSpeed) | |
select[0].selectedIndex = 0; | |
jQuery(option.options).each(function(i) { | |
if (!select[0].selectedIndex && this.value == selectedValue) { | |
select[0].selectedIndex = i; | |
if (settings.selectBlank != null && !option.singleOption) { | |
select[0].selectedIndex++; | |
} | |
} | |
}) | |
} | |
}) | |
if (settings.optBlank != null) { | |
optSelect.prepend('<option value="">'+settings.optBlank+'</option>'); | |
if (optSelectSelected != null) { | |
optSelectSelected++; | |
} | |
} | |
if (optSelectSelected == null) { | |
optSelectSelected = 0; | |
} | |
optSelect[0].selectedIndex = optSelectSelected; | |
optSelect.change(); | |
}); | |
} | |
jQuery(document).ready(function() { | |
var optgroups = [] | |
jQuery('optgroup').each(function(){ | |
var select = this | |
do { | |
select = select.parentElement | |
} while (select.nodeName != 'SELECT') | |
if (0 > jQuery.inArray(select, optgroups)) { | |
optgroups[optgroups.length] = select; | |
} | |
}); | |
jQuery(optgroups).each(function(){ | |
jQuery(this).selectOptgroup(); | |
}); | |
}); | |
})(django.jQuery); |
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