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Add additional search and filter functions to the Tweakers Pricewatch
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// ==UserScript==
// @name Tweakers Pricewatch search extension
// @namespace http://remyblok.tweakers.net/
// @version 0.2
// @description Add additional search and filter functions to the Tweakers Pricewatch
// @author Remy Blok
// @match https://*.tweakers.net/*
// @run-at document-idle
// @grand unsafeWindow
// ==/UserScript==
(function() {
'use strict';
var debug = false;
function FilterFormExtended(filterForm) {
this.filterForm = filterForm;
this.originalHandleAjaxResponse = null;
}
Object.extend(FilterFormExtended.prototype, {
init: function () {
this.hideMoreLinks();
},
hideMoreLinks: function () {
if (!filterForm.listing) return;
// find all the links more/less options link
var links = Selector('.showLink, .hideLink');
var i = 0, link;
while ((link = links[i++])) {
//this is the id of the div element of the current filter
var filterName = link.parentNode.parentNode.id;
//just a check to see the scipt is working
if (debug)
link.innerHTML = link.innerHTML + " extended";
// we want additional things to happen when the user clicks on the link
this.filterForm.addSimpleEvent(link, 'onclick', this.toggleHideMore);
// creating HTML, could be rendered at the server
this.generateHtml(link, filterName);
//select the ul element of the extended filter
var ul = Selector('#' + filterName + '_extendedFilter', link.parentNode)[0];
// get the actual filter element
var filter = Selector('#' + filterName + '_filter', ul)[0];
filter.onkeyup = this.filterList;
// get the actual select all element
var selectAllCheckbox = Selector('#' + filterName + '_selectall', ul)[0];
selectAllCheckbox.onclick = this.selectAll;
// create a options bag to store key references into
var options = {};
options.filterName = filterName;
options.filterElement = filter;
options.filterContainer = ul;
options.selectAllCheckbox = selectAllCheckbox;
// figure out what option values there are in the filer
// we need to exclude the li elements from the extended filter
options.optionsElements = Selector('ul:not(#' + ul.id + ') li', link.parentNode);
filter.options = options;
selectAllCheckbox.options = options;
link.options = options;
// trigger the initial visibility
this.toggleHideMore.call(link);
}
// replace the original handleAjaxResponse method so we can inject our onw code first.
this.originalHandleAjaxResponse = this.filterForm.handleAjaxResponse;
this.filterForm.handleAjaxResponse = this.handleAjaxResponse;
},
generateHtml: function (link, filterName) {
var html =
('<li>' +
'<input type="text" id="{filterName}_filter" name="extendedFilter" class="text" placehoder="Filter">' +
'</li>' +
'<li>' +
'<label for="{filterName}_selectall" class="checkbox">' +
'<span class="inputWrapper">' +
'<input type="checkbox" name="extendedSelectall" id="{filterName}_selectall" value="{filterName}_selectall">' +
'</span> ' +
'<span title="Alles Selecteren" class="facetLabel"><b>Alles Selecteren</b></span>' +
'</label>' +
'</li>').replace(/{filterName}/g, filterName);
// add the a new ul to the page
// separate ul used so that is can be easily hidden
var ul = document.createElement('ul');
ul.id = filterName + "_extendedFilter";
ul.innerHTML = html;
link.parentNode.insertBefore(ul, link.previousSibling.previousSibling); // before the link there ar two ul elements, we place it above these two elements
},
handleAjaxResponse: function (response) {
// validate the data is OK
var data = checkJsonResponse(response);
// because the querystring returned from the server does not include the extended field these need to be added
// otherwise the original handleAjaxResponse will clear the form, and not reset the values
if (data && 'querystring' in data) {
// first we do all the select all comboboxes
var selectAlls = Selector("[name='extendedSelectall']");
var i = 0, selectAll;
data.querystring.extendedSelectall = [];
while ((selectAll = selectAlls[i++])) {
if (selectAll.checked)
data.querystring.extendedSelectall[data.querystring.extendedSelectall.length] = selectAll.value;
}
// now the do the user typed filer
var filters = Selector("[name='extendedFilter']");
var j = 0, filter;
// we check if there is a value filled in and then add it to the query string.
while ((filter = filters[j++])) {
if (filter.value && filter.value !== '' )
data.querystring[filter.id] = filter.value;
}
}
// call the original method
filterFormExtended.originalHandleAjaxResponse.call(this, response);
},
// 'this' is the 'a'-element of the show/hide more link
toggleHideMore: function () {
// because the original code has already run the check is the other way around
if (this.className != /*==*/ 'showLink') {
removeClass(this.options.filterContainer, 'hideMore');
} else {
addClass(this.options.filterContainer, 'hideMore');
// reset the filter and make sure all options are visible again
removeClass(this.options.selectAllCheckbox.parentNode.parentNode, 'selected');
this.options.selectAllCheckbox.checked = false;
this.options.filterElement.value = '';
filterFormExtended.filterList.call(this.options.filterElement);
}
},
// onKeyUp event of the filter box
// 'this' is the 'input'-element text filter
filterList: function () {
// we don't want to be case sensitive
var searchString = this.value.toLowerCase();
var i = 0, li, needsScreenUpdate = false, shownItems = 0, checkedItems = 0;
// loop over all options within this filter to see if they match
// if they don't match we hide them, oterwise we show them
// it also keeps track of the state of the checkbox before it was hidden
// so then when it is shown again we can reset the correct state
while ((li = this.options.optionsElements[i++])) {
var label = singleOrNull(Selector('.facetLabel', li));
var checkbox = singleOrNull(Selector('input', li));
if (label !== null && checkbox !== null) {
// do the string comparision, also here lower case
if (label.innerText.toLowerCase().includes(searchString)) {
// if it is currently hidden, we need to make it visible
if (li.className == 'hideMore') {
removeClass(li, 'hideMore');
// restore the state of check box from before the filter
if (checkbox.checkedBeforeFilter) {
checkbox.checked = checkbox.checkedBeforeFilter;
}
checkbox.checkedBeforeFilter = checkbox.checked;
// if a checked option is now visible we need to refresh the screen
needsScreenUpdate |= checkbox.checked;
}
shownItems++;
if (checkbox.checked) {
checkedItems++;
}
}
// only hide it if it is not already hidden
// otherwise we override the checkedBeforeFilter state
else if (li.className != 'hideMore') {
addClass(li, 'hideMore');
// if a checked option is now hidden we need to refresh the screen
needsScreenUpdate |= checkbox.checked;
checkbox.checkedBeforeFilter = checkbox.checked;
// make sure the option in no longer checked
checkbox.checked = false;
}
}
}
// disable the select all button if there are no options
this.options.selectAllCheckbox.disabled = shownItems === 0;
// show the selected all button as selected if all filter options are selected
if (shownItems > 0 && checkedItems === shownItems) {
addClass(this.options.selectAllCheckbox.parentNode.parentNode, 'selected');
this.options.selectAllCheckbox.checked = true;
} else {
removeClass(this.options.selectAllCheckbox.parentNode.parentNode, 'selected');
this.options.selectAllCheckbox.checked = false;
}
// finally update the page with the selected options if needed
if (needsScreenUpdate) {
filterForm.ajaxTimer();
}
},
// onClick event of the selected all combobox
// 'this' is sthe 'input'-element combobox
selectAll: function (e) {
var i = 0, li, needsScreenUpdate = false;
// loop over all options, check if there are not hidden due to the text filter
// then check the options
while ((li = this.options.optionsElements[i++])) {
if (!this.checked || li.className != 'hideMore') {
var checkbox = singleOrNull(Selector('input', li));
if (checkbox !== null) {
// only update the screen if the checkbox is switched from state
needsScreenUpdate |= (checkbox.checked != this.checked);
checkbox.checked = this.checked;
}
}
}
// finally update the page with the selected options if needed
if (needsScreenUpdate)
filterForm.ajaxTimer();
},
});
// little helper function to get the first element from an array
function singleOrNull(array) {
if (Array.isArray(array) && array.length == 1) {
return array[0];
}
return null;
}
// init the code
if (unsafeWindow.filterForm) {
var filterFormExtended = new FilterFormExtended(filterForm);
filterFormExtended.init();
}
})();