pjs/webtools/bugzilla/productmenu.js

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JavaScript
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// Adds to the target select object all elements in array that
// correspond to the elements selected in source.
// - array should be a array of arrays, indexed by product name. the
// array should contain the elements that correspont to that
// product. Example:
// var array = Array();
// array['ProductOne'] = [ 'ComponentA', 'ComponentB' ];
// updateSelect(array, source, target);
// - sel is a list of selected items, either whole or a diff
// depending on sel_is_diff.
// - sel_is_diff determines if we are sending in just a diff or the
// whole selection. a diff is used to optimize adding selections.
// - target should be the target select object.
// - single specifies if we selected a single item. if we did, no
// need to merge.
function updateSelect( array, sel, target, sel_is_diff, single, blank ) {
var i, j, comp;
// if single, even if it's a diff (happens when you have nothing
// selected and select one item alone), skip this.
if ( ! single ) {
// array merging/sorting in the case of multiple selections
if ( sel_is_diff ) {
// merge in the current options with the first selection
comp = merge_arrays( array[sel[0]], target.options, 1 );
// merge the rest of the selection with the results
for ( i = 1 ; i < sel.length ; i++ ) {
comp = merge_arrays( array[sel[i]], comp, 0 );
}
} else {
// here we micro-optimize for two arrays to avoid merging with a
// null array
comp = 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++ ) {
comp = merge_arrays( comp, array[sel[i]], 0 );
}
}
} else {
// single item in selection, just get me the list
comp = array[sel[0]];
}
// save the selection in the target select so we can restore it later
var selections = new Array();
for ( i = 0; i < target.options.length; i++ )
if (target.options[i].selected) selections.push(target.options[i].value);
// clear select
target.options.length = 0;
// add empty "Any" value back to the list
if (blank) target.options[0] = new Option( blank, "" );
// load elements of list into select
for ( i = 0; i < comp.length; i++ ) {
target.options[target.options.length] = new Option( comp[i], comp[i] );
}
// restore the selection
for ( i=0 ; i<selections.length ; i++ )
for ( j=0 ; j<target.options.length ; j++ )
if (target.options[j].value == selections[i]) target.options[j].selected = true;
}
// Returns elements in a that are not in b.
// NOT A REAL DIFF: does not check the reverse.
// - a,b: arrays of values to be compare.
function fake_diff_array( a, b ) {
var newsel = new Array();
// do a boring array diff to see who's new
for ( var ia in a ) {
var found = 0;
for ( var ib in b ) {
if ( a[ia] == b[ib] ) {
found = 1;
}
}
if ( ! found ) {
newsel[newsel.length] = a[ia];
}
found = 0;
}
return newsel;
}
// takes two arrays and sorts them by string, returning a new, sorted
// array. the merge removes dupes, too.
// - a, b: arrays to be merge.
// - b_is_select: if true, then b is actually an optionitem and as
// such we need to use item.value on it.
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 ) ) {
if ( b_is_select ) {
bitem = b[pos_b].value;
} else {
bitem = b[pos_b];
}
aitem = a[pos_a];
// 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, inc 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;
}
// selectProduct reads the selection from f[productfield] and updates
// f.version, component and target_milestone accordingly.
// - f: a form containing product, component, varsion and
// target_milestone select boxes.
// globals (3vil!):
// - cpts, vers, tms: array of arrays, indexed by product name. the
// subarrays contain a list of names to be fed to the respective
// selectboxes. For bugzilla, these are generated with perl code
// at page start.
// - usetms: this is a global boolean that is defined if the
// bugzilla installation has it turned on. generated in perl too.
// - first_load: boolean, specifying if it's the first time we load
// the query page.
// - last_sel: saves our last selection list so we know what has
// changed, and optimize for additions.
function selectProduct( f , productfield, componentfield, blank ) {
// this is to avoid handling events that occur before the form
// itself is ready, which happens in buggy browsers.
if ( ( !f ) || ( ! f[productfield] ) ) {
return;
}
// if this is the first load and nothing is selected, no need to
// merge and sort all components; perl gives it to us sorted.
if ( ( first_load ) && ( f[productfield].selectedIndex == -1 ) ) {
first_load = 0;
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 = 0;
// - sel keeps the array of products we are selected.
// - is_diff says if it's a full list or just a list of products that
// were added to the current selection.
// - single indicates if a single item was selected
// - selectedIndex is the index of the first selected item
// - selectedValue is the value of the first selected item
var sel = Array();
var is_diff = 0;
var single;
var selectedIndex = f[productfield].selectedIndex;
var selectedValue = f[productfield].options[selectedIndex].value;
// If nothing is selected, or the selected item is the "blank" value
// at the top of the list which represents all products on drop-down menus,
// then pick all products so we show all components.
if ( selectedIndex == -1 || !cpts[selectedValue])
{
for ( var i = blank ? 1 : 0 ; i < f[productfield].length ; i++ ) {
sel[sel.length] = f[productfield].options[i].value;
}
single = 0;
} else {
for ( i = blank ? 1 : 0 ; i < f[productfield].length ; i++ ) {
if ( f[productfield].options[i].selected ) {
sel[sel.length] = f[productfield].options[i].value;
}
}
single = ( sel.length == 1 );
// save last_sel before we kill it
var tmp = last_sel;
last_sel = sel;
// this is an optimization: if we've added components, no need
// to remerge them; just merge the new ones with the existing
// options.
if ( ( tmp ) && ( tmp.length < sel.length ) ) {
sel = fake_diff_array(sel, tmp);
is_diff = 1;
}
}
// do the actual fill/update
updateSelect( cpts, sel, f[componentfield], is_diff, single, blank );
}