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resource-view-filters.js
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resource-view-filters.js
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this.ckan.module('resource-view-filters', function (jQuery) {
'use strict';
function initialize() {
var self = this,
resourceId = self.options.resourceId,
fields = self.options.fields,
dropdownTemplate = self.options.dropdownTemplate,
addFilterTemplate = '<a class="btn btn-primary" href="#">' + self._('Add Filter') + '</a>',
filtersDiv = $('<div></div>');
var filters = ckan.views.filters.get();
_appendDropdowns(filtersDiv, resourceId, dropdownTemplate, fields, filters);
var addFilterButton = _buildAddFilterButton(filtersDiv, addFilterTemplate, fields, filters, function (evt) {
// Build filters object with this element's val as key and a placeholder
// value so _appendDropdowns() will create its dropdown
var filters = {};
filters[evt.val] = [];
$(this).select2('destroy');
_appendDropdowns(filtersDiv, resourceId, dropdownTemplate, fields, filters);
evt.preventDefault();
});
self.el.append(filtersDiv);
self.el.append(addFilterButton);
}
function _buildAddFilterButton(el, template, fields, filters, onChangeCallback) {
var self = this,
addFilterButton = $(template),
currentFilters = Object.keys(filters),
fieldsNotFiltered = $.grep(fields, function (field) {
return !filters.hasOwnProperty(field);
}),
data = $.map(fieldsNotFiltered, function (d) {
return { id: d, text: d };
});
if (data.length === 0) {
return '';
}
addFilterButton.click(function (evt) {
// FIXME: Move this class name to some external variable to keep it DRY
var addFilterDiv = $('<div class="resource-view-filter"><input type="hidden"></input></div>'),
addFilterInput = addFilterDiv.find('input');
el.append(addFilterDiv);
// TODO: Remove element from "data" when some select selects it.
addFilterInput.select2({
data: data,
placeholder: self._('Select a field'),
width: 'resolve',
}).on('change', onChangeCallback);
evt.preventDefault();
});
return addFilterButton;
}
function _appendDropdowns(dropdowns, resourceId, template, fields, filters) {
$.each(fields, function (i, field) {
if (filters.hasOwnProperty(field)) {
dropdowns.append(_buildDropdown(self.el, template, field));
}
});
return dropdowns;
function _buildDropdown(el, template, filterName) {
var theseFilters = filters[filterName] || [];
template = $(template.replace(/{filter}/g, filterName));
// FIXME: Get the CSS class from some external variable
var dropdowns = template.find('.resource-view-filter-values');
// Can't use push because we need to create a new array, as we're
// modifying it.
theseFilters = theseFilters.concat([undefined]);
theseFilters.forEach(function (value, i) {
var dropdown = $('<input type="hidden" name="'+filterName+'"></input>');
if (value !== undefined) {
dropdown.val(value);
}
dropdowns.append(dropdown);
});
var queryLimit = 20;
dropdowns.find('input').select2({
allowClear: true,
placeholder: ' ', // select2 needs a placeholder to allow clearing
width: 'resolve',
minimumInputLength: 0,
ajax: {
url: '/api/3/action/datastore_search',
datatype: 'json',
quietMillis: 200,
cache: true,
data: function (term, page) {
var offset = (page - 1) * queryLimit,
query;
query = {
plain: false,
resource_id: resourceId,
limit: queryLimit,
offset: offset,
fields: filterName,
distinct: true,
sort: filterName
};
if (term !== '') {
var q = {};
q[filterName] = term + ':*';
query.q = JSON.stringify(q);
}
return query;
},
results: function (data, page) {
var records = data.result.records,
hasMore = (records.length < data.result.total),
results;
results = $.map(records, function (record) {
return { id: record[filterName], text: String(record[filterName]) };
});
return { results: results, more: hasMore };
}
},
initSelection: function (element, callback) {
var data = {id: element.val(), text: element.val()};
callback(data);
},
}).on('change', _onChange);
return template;
}
}
function _onChange(evt) {
var filterName = evt.currentTarget.name,
filterValue = evt.val,
currentFilters = ckan.views.filters.get(filterName) || [],
addToIndex = currentFilters.length;
// Make sure we're not editing the original array, but a copy.
currentFilters = currentFilters.slice();
if (evt.removed) {
addToIndex = currentFilters.indexOf(evt.removed.id);
if (addToIndex !== -1) {
currentFilters.splice(addToIndex, 1);
}
}
if (evt.added) {
currentFilters.splice(addToIndex, 0, filterValue);
}
if (currentFilters.length > 0) {
ckan.views.filters.set(filterName, currentFilters);
} else {
ckan.views.filters.unset(filterName);
}
}
return {
initialize: initialize,
options: {
dropdownTemplate: [
'<div class="resource-view-filter">',
' {filter}:',
' <div class="resource-view-filter-values"></div>',
'</div>',
].join('\n')
}
};
});