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multiselect.js
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multiselect.js
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class MultiSelect {
constructor(multiselect) {
this.multiselect = multiselect;
}
init() {
function isOutsideNodeAndChildren($node, e) {
// if the target of the click isn't the container...
// nor a descendant of the container
if (!$node.is(e.target) && $node.has(e.target).length === 0) {
return true;
} else {
return false;
}
}
// constructor definition
function MultiSelect($select) {
this.$select = $select;
this.$outer;
this.$field;
this.$optionList;
this.$options;
this.isActive = false;
this.createMultiSelectOption = function(optionText, fieldName) {
var option = document.createElement('div');
var checkbox = document.createElement('input');
var label = document.createElement('label');
option.className = 'multi-select_option';
option.tabIndex = -1;
checkbox.className = 'multi-select_checkbox';
checkbox.type = "checkbox";
checkbox.tabIndex = '-1';
checkbox.name = fieldName;
label.className = 'multi-select_label';
label.htmlFor = fieldName;
label.textContent = optionText
label.value = optionText
option.appendChild(checkbox);
option.appendChild(label);
return option;
}
this.toggleSelected = function($option, e, placeholder) {
var $allCheckedOptions;
var numChecked;
var checkBox = $option.find('.multi-select_checkbox')[0];
var $field = $option.parents('.multi-select').find('.multi-select_field');
if (e.target.type !== 'checkbox') {
if (checkBox.checked) checkBox.checked = false;
else checkBox.checked = true;
}
$allCheckedOptions = $option.parent().find('.multi-select_option').has(':checked');
numChecked = $allCheckedOptions.length;
if (numChecked) {
$field.removeClass('is-empty');
if (numChecked < 3) {
var selectedText = [];
$allCheckedOptions.find('.multi-select_label').each(function() {
selectedText.push($(this).text());
});
$field.text( selectedText );
} else {
$field.text(numChecked + ' selected')
}
} else {
$field.addClass('is-empty');
$field.text(placeholder);
}
}
this.activate = function(that) {
this.$outer.addClass('is-active');
this.$optionList.addClass('is-open');
this.isActive = true;
// make any click outside of the active multiselect close it.
$(document).on('click.closeMulti', function(e) {
if (isOutsideNodeAndChildren(that.$outer, e)) {
that.deactivate();
}
});
}
this.deactivate = function() {
// reset scroll position to top when opened again
this.$optionList.scrollTop(0);
this.$outer.removeClass('is-active');
this.$optionList.removeClass('is-open');
this.isActive = false;
$(document).off('.closeMulti');
}
this.attachClickEvents = function(that, placeholder) {
this.$field.on('click', function(e) {
// open options if not already open
if (that.isActive) return;
that.activate(that);
});
this.$options.on('click', function(e) {
that.toggleSelected($(this), e, placeholder);
});
}
this.attachKeyboardEvents = function(that, placeholder) {
// enforce blur on tab when any part of multi is focused.
this.$field.on('keydown', function(e) {
if (e.keyCode === 9) {
that.deactivate();
return;
}
if (e.keyCode === 40) {
that.activate(that);
that.$options.first().focus();
// don't scroll the options list, let the focus handle that.
e.preventDefault();
return;
}
});
this.$options.on('keydown', function(e) {
switch (e.keyCode) {
case 9:
that.deactivate();
break;
case 13:
that.toggleSelected($(this), e, placeholder);
break;
case 40:
$(this).next().focus();
// don't scroll the options list, let the focus handle that.
e.preventDefault();
break;
case 38:
$(this).prev().focus();
// don't scroll the options list, let the focus handle that.
e.preventDefault();
break;
default:
// do nothing;
break;
}
});
}
this.init = function() {
var that = this;
var $options = this.$select.find('option');
var fieldName = this.$select.attr('name');
var placeholder = this.$select.attr('placeholder');
console.log(placeholder);
var multiSelect = document.createElement('div');
var field = document.createElement('div');
var optionsList = document.createElement('div');
multiSelect.className = 'multi-select';
field.className = 'multi-select_field is-empty';
field.tabIndex = 0;
field.textContent = placeholder;
optionsList.className = 'multi-select_options';
$options.each(function() {
// if option is empty don't include it in the multi-select list
if (!this.textContent) return;
var o = that.createMultiSelectOption(this.textContent, fieldName);
optionsList.appendChild(o);
});
multiSelect.appendChild(field);
multiSelect.appendChild(optionsList);
// replace regular dropdown w/ multi-select dropdown
$(multiSelect).insertBefore(this.$select);
this.$select.remove();
this.$select = null;
// cache multiSelect selectors
this.$outer = $(multiSelect);
this.$field = this.$outer.find('.multi-select_field');
this.$optionList = this.$outer.find('.multi-select_options');
this.$options = this.$outer.find('.multi-select_option');
// attach multiSelect event handlers
this.attachClickEvents(this, placeholder);
this.attachKeyboardEvents(this, placeholder);
}
}
// selectToMultiSelect plugin definition
$.fn.selectToMultiSelect = function(settings) {
var m = new MultiSelect($(this));
m.init();
}
$('.js-multi-select').each( function() {
$(this).selectToMultiSelect();
});
}
}
export default MultiSelect;