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(function($) {
/** Available options are:
* availableTags (Array) -- Used as tag suggestions
* existingTags (Array) *optional -- Used to prefill the tag selector with tags
* namePrefix (String) *optional -- Used as input name attribute, default to "item[tags]"
*/
$.fn.tagit = function(options) {
var el = this;
const BACKSPACE = 8;
const ENTER = 13;
const SPACE = 32;
const COMMA = 44;
// add the tagit CSS class.
el.addClass("tagit");
// create the input field.
var html_input_field = "<li class=\"tagit-new\"><input class=\"tagit-input\" type=\"text\" /></li>\n";
el.html (html_input_field);
tag_input = el.children(".tagit-new").children(".tagit-input");
if (typeof options.existingTags != 'undefined' && typeof options.existingTags == 'object') {
for(var i in options.existingTags) {
create_choice(options.existingTags[i]);
}
}
$(this).click(function(e){
if (e.target.tagName == 'A') {
// Removes a tag when the little 'x' is clicked.
// Event is binded to the UL, otherwise a new tag (LI > A) wouldn't have this event attached to it.
$(e.target).parent().remove();
}
else {
// Sets the focus() to the input field, if the user clicks anywhere inside the UL.
// This is needed because the input field needs to be of a small size.
tag_input.focus();
}
});
tag_input.keypress(function(event){
if (event.which == BACKSPACE) {
if (tag_input.val() == "") {
// When backspace is pressed, the last tag is deleted.
$(el).children(".tagit-choice:last").remove();
}
}
// Comma/Space/Enter are all valid delimiters for new tags.
else if (event.which == COMMA || event.which == SPACE || event.which == ENTER) {
event.preventDefault();
var typed = tag_input.val();
typed = typed.replace(/,+$/,"");
typed = typed.trim();
if (typed != "") {
if (is_new (typed)) {
create_choice(typed);
}
// Cleaning the input.
tag_input.val("");
}
}
});
tag_input.autocomplete({
source: options.availableTags,
select: function(event,ui){
if (is_new (ui.item.value)) {
create_choice (ui.item.value);
}
// Cleaning the input.
tag_input.val("");
// Preventing the tag input to be update with the chosen value.
return false;
}
});
function is_new (value){
var is_new = true;
this.tag_input.parents("ul").children(".tagit-choice").each(function(i){
n = $(this).children("input").val();
if (value == n) {
is_new = false;
}
})
return is_new;
}
function create_choice (value){
name_prefix = (typeof(options.namePrefix) == 'undefined') ? 'item[tags]' : options.namePrefix;
var el = "";
el = "<li class=\"tagit-choice\">\n";
el += value + "\n";
el += "<a class=\"close\">x</a>\n";
el += "<input type=\"hidden\" style=\"display:none;\" value=\""+value+"\" name=\""+name_prefix+"[]\">\n";
el += "</li>\n";
var li_search_tags = this.tag_input.parent();
$(el).insertBefore (li_search_tags);
this.tag_input.val("");
}
};
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g,"");
};
})(jQuery);
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