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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Source Code Form is "Incompatible With Secondary Licenses", as
* defined by the Mozilla Public License, v. 2.0.
*/
// Functions to update form select elements based on a
// collection of javascript arrays containing strings.
/**
* Reads the selected classifications and updates product, component,
* version and milestone lists accordingly.
*
* @param classfield Select element that contains classifications.
* @param product Select element that contains products.
* @param component Select element that contains components. Can be null if
* there is no such element to update.
* @param version Select element that contains versions. Can be null if
* there is no such element to update.
* @param milestone Select element that contains milestones. Can be null if
* there is no such element to update.
*
* @global prods Array of products indexed by classification name.
* @global first_load Boolean; true if this is the first time this page loads
* or false if not.
* @global last_sel Array that contains last list of products so we know what
* has changed, and optimize for additions.
*/
function selectClassification(classfield, product, component, version, milestone) {
// This is to avoid handling events that occur before the form
// itself is ready, which could happen in buggy browsers.
if (!classfield)
return;
// If this is the first load and nothing is selected, no need to
// merge and sort all lists; they are created sorted.
if ((first_load) && (classfield.selectedIndex == -1)) {
first_load = false;
return;
}
// Don't reset first_load as done in selectProduct. That's because we
// want selectProduct to handle the first_load attribute.
// Stores classifications that are selected.
var sel = Array();
// True if sel array has a full list or false if sel contains only
// new classifications that are to be merged to the current list.
var merging = false;
// If nothing selected, pick all.
var findall = classfield.selectedIndex == -1;
sel = get_selection(classfield, findall, false);
if (!findall) {
// Save sel for the next invocation of selectClassification().
var tmp = sel;
// This is an optimization: if we have just added classifications to an
// existing selection, no need to clear the form elements and add
// everything again; just merge the new ones with the existing
// options.
if ((last_sel.length > 0) && (last_sel.length < sel.length)) {
sel = fake_diff_array(sel, last_sel);
merging = true;
}
last_sel = tmp;
}
// Save original options selected.
var saved_prods = get_selection(product, false, true, null);
// Do the actual fill/update, reselect originally selected options.
updateSelect(prods, sel, product, merging, null);
restoreSelection(product, saved_prods);
selectProduct(product, component, version, milestone, null);
}
/**
* Reads the selected products and updates component, version and milestone
* lists accordingly.
*
* @param product Select element that contains products.
* @param component Select element that contains components. Can be null if
* there is no such element to update.
* @param version Select element that contains versions. Can be null if
* there is no such element to update.
* @param milestone Select element that contains milestones. Can be null if
* there is no such element to update.
* @param anyval Value to use for a special "Any" list item. Can be null
* to not use any. If used must and will be first item in
* the select element.
*
* @global cpts Array of arrays, indexed by product name. The subarrays
* contain a list of components to be fed to the respective
* select element.
* @global vers Array of arrays, indexed by product name. The subarrays
* contain a list of versions to be fed to the respective
* select element.
* @global tms Array of arrays, indexed by product name. The subarrays
* contain a list of milestones to be fed to the respective
* select element.
* @global first_load Boolean; true if this is the first time this page loads
* or false if not.
* @global last_sel Array that contains last list of products so we know what
* has changed, and optimize for additions.
*/
function selectProduct(product, component, version, milestone, anyval) {
// This is to avoid handling events that occur before the form
// itself is ready, which could happen in buggy browsers.
if (!product)
return;
// Do nothing if no products are defined. This is to avoid the
// "a has no properties" error from merge_arrays function.
if (product.length == (anyval != null ? 1 : 0))
return;
// If this is the first load and nothing is selected, no need to
// merge and sort all lists; they are created sorted.
if ((first_load) && (product.selectedIndex == -1)) {
first_load = false;
return;
}
// Turn first_load off. This is tricky, since it seems to be
// redundant with the above clause. It's not: if when we first load
// the page there is _one_ element selected, it won't fall into that
// clause, and first_load will remain 1. Then, if we unselect that
// item, selectProduct will be called but the clause will be valid
// (since selectedIndex == -1), and we will return - incorrectly -
// without merge/sorting.
first_load = false;
// Stores products that are selected.
var sel = Array();
// True if sel array has a full list or false if sel contains only
// new products that are to be merged to the current list.
var merging = false;
// If nothing is selected, or the special "Any" option is selected
// which represents all products, then pick all products so we show
// all components.
var findall = (product.selectedIndex == -1
|| (anyval != null && product.options[0].selected));
if (useclassification) {
// Update index based on the complete product array.
sel = get_selection(product, findall, true, anyval);
for (var i=0; i<sel.length; i++)
sel[i] = prods[sel[i]];
}
else {
sel = get_selection(product, findall, false, anyval);
}
if (!findall) {
// Save sel for the next invocation of selectProduct().
var tmp = sel;
// This is an optimization: if we have just added products to an
// existing selection, no need to clear the form controls and add
// everybody again; just merge the new ones with the existing
// options.
if ((last_sel.length > 0) && (last_sel.length < sel.length)) {
sel = fake_diff_array(sel, last_sel);
merging = true;
}
last_sel = tmp;
}
// Do the actual fill/update.
if (component) {
var saved_cpts = get_selection(component, false, true, null);
updateSelect(cpts, sel, component, merging, anyval);
restoreSelection(component, saved_cpts);
}
if (version) {
var saved_vers = get_selection(version, false, true, null);
updateSelect(vers, sel, version, merging, anyval);
restoreSelection(version, saved_vers);
}
if (milestone) {
var saved_tms = get_selection(milestone, false, true, null);
updateSelect(tms, sel, milestone, merging, anyval);
restoreSelection(milestone, saved_tms);
}
}
/**
* Adds to the target select element all elements from array that
* correspond to the selected items.
*
* @param array An array of arrays, indexed by number. The array should
* contain elements for each selection.
* @param sel A list of selected items, either whole or a diff depending
* on merging parameter.
* @param target Select element that is to be updated.
* @param merging Boolean that determines if we are merging in a diff or
* substituting the whole selection. A diff is used to optimize
* adding selections.
* @param anyval Name of special "Any" value to add. Can be null if not used.
* @return Boolean; true if target contains options or false if target
* is empty.
*
* Example (compsel is a select form element):
*
* var components = Array();
* components[1] = [ 'ComponentA', 'ComponentB' ];
* components[2] = [ 'ComponentC', 'ComponentD' ];
* source = [ 2 ];
* updateSelect(components, source, compsel, false, null);
*
* This would clear compsel and add 'ComponentC' and 'ComponentD' to it.
*/
function updateSelect(array, sel, target, merging, anyval) {
var i, item;
// If we have no versions/components/milestones.
if (array.length < 1) {
target.options.length = 0;
return false;
}
if (merging) {
// Array merging/sorting in the case of multiple selections
// merge in the current options with the first selection.
item = merge_arrays(array[sel[0]], target.options, 1);
// Merge the rest of the selection with the results.
for (i = 1 ; i < sel.length ; i++)
item = merge_arrays(array[sel[i]], item, 0);
}
else if (sel.length > 1) {
// Here we micro-optimize for two arrays to avoid merging with a
// null array.
item = merge_arrays(array[sel[0]],array[sel[1]], 0);
// Merge the arrays. Not very good for multiple selections.
for (i = 2; i < sel.length; i++)
item = merge_arrays(item, array[sel[i]], 0);
}
else {
// Single item in selection, just get me the list.
item = array[sel[0]];
}
// Clear current selection.
target.options.length = 0;
// Add special "Any" value back to the list.
if (anyval != null)
target.options[0] = new Option(anyval, "");
// Load elements of list into select element.
for (i = 0; i < item.length; i++)
target.options[target.options.length] = new Option(item[i], item[i]);
return true;
}
/**
* Selects items in select element that are defined to be selected.
*
* @param control Select element of which selected options are to be restored.
* @param selnames Array of option names to select.
*/
function restoreSelection(control, selnames) {
// Right. This sucks but I see no way to avoid going through the
// list and comparing to the contents of the control.
for (var j = 0; j < selnames.length; j++)
for (var i = 0; i < control.options.length; i++)
if (control.options[i].value == selnames[j])
control.options[i].selected = true;
}
/**
* Returns elements in a that are not in b.
* NOT A REAL DIFF: does not check the reverse.
*
* @param a First array to compare.
* @param b Second array to compare.
* @return Array of elements in a but not in b.
*/
function fake_diff_array(a, b) {
var newsel = new Array();
var found = false;
// Do a boring array diff to see who's new.
for (var ia in a) {
for (var ib in b)
if (a[ia] == b[ib])
found = true;
if (!found)
newsel[newsel.length] = a[ia];
found = false;
}
return newsel;
}
/**
* Takes two arrays and sorts them by string, returning a new, sorted
* array. The merge removes dupes, too.
*
* @param a First array to merge.
* @param b Second array or an optionitem element to merge.
* @param b_is_select Boolean; true if b is an optionitem element (need to
* access its value by item.value) or false if b is a
* an array.
* @return Merged and sorted array.
*/
function merge_arrays(a, b, b_is_select) {
var pos_a = 0;
var pos_b = 0;
var ret = new Array();
var bitem, aitem;
// Iterate through both arrays and add the larger item to the return
// list. Remove dupes, too. Use toLowerCase to provide
// case-insensitivity.
while ((pos_a < a.length) && (pos_b < b.length)) {
aitem = a[pos_a];
if (b_is_select)
bitem = b[pos_b].value;
else
bitem = b[pos_b];
// Smaller item in list a.
if (aitem.toLowerCase() < bitem.toLowerCase()) {
ret[ret.length] = aitem;
pos_a++;
}
else {
// Smaller item in list b.
if (aitem.toLowerCase() > bitem.toLowerCase()) {
ret[ret.length] = bitem;
pos_b++;
}
else {
// List contents are equal, include both counters.
ret[ret.length] = aitem;
pos_a++;
pos_b++;
}
}
}
// Catch leftovers here. These sections are ugly code-copying.
if (pos_a < a.length)
for (; pos_a < a.length ; pos_a++)
ret[ret.length] = a[pos_a];
if (pos_b < b.length) {
for (; pos_b < b.length; pos_b++) {
if (b_is_select)
bitem = b[pos_b].value;
else
bitem = b[pos_b];
ret[ret.length] = bitem;
}
}
return ret;
}
/**
* Returns an array of indexes or values of options in a select form element.
*
* @param control Select form element from which to find selections.
* @param findall Boolean; true to return all options or false to return
* only selected options.
* @param want_values Boolean; true to return values and false to return
* indexes.
* @param anyval Name of a special "Any" value that should be skipped. Can
* be null if not used.
* @return Array of all or selected indexes or values.
*/
function get_selection(control, findall, want_values, anyval) {
var ret = new Array();
if ((!findall) && (control.selectedIndex == -1))
return ret;
for (var i = (anyval != null ? 1 : 0); i < control.length; i++)
if (findall || control.options[i].selected)
ret[ret.length] = want_values ? control.options[i].value : i;
return ret;
}
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