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|
/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: jan@swi-prolog.org
WWW: http://www.swi-prolog.org
Copyright (c) 2022, SWI-Prolog Solutions b.v.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(dom,
[ get_by_id/2, % +Id,-Element
get_prop/3, % +Elem,+Name,-Value
get_attr/3, % +Elem,+Name,-Value
remove/1, % +Elem
create/2, % TagName,Elem
set_html/2, % +Elem,+HTML:string
add_class/2, % Elem,Class
append_child/2, % +Elem,+Child
parent_of/2, % ?Child,?Parent
bind/4 % +Elem,+EventType,-Event,:Goal
]).
:- use_module(wasm).
/** <module> Tau-Prolog compatible DOM manipulation
This module is part of the WASM distribution of SWI-Prolog. It
implements the Tau-Prolog DOM library.
@tbd This library is incomplete and error conditions are most likely
incompatible.
*/
:- meta_predicate
bind(+,+,-,:).
%! get_by_id(+Id, -Element) is semidet.
%
% True when the current document has Element with Id.
get_by_id(Id, Elem) :-
Elem := document.getElementById(#Id),
Elem \== undefined.
%! get_attr(+Elem, +Name, -Value) is semidet.
%! get_prop(+Elem, +Name, -Value) is semidet.
%
% Get an attribute (property) from a JavaScript object. Fails if the
% attribute is `undefined`.
%
% Note that this predicate conflicts with SWI-Prolog get_attr/3 to get
% attributes from a variable. For this reason we also make this
% predicate available as get_prop/3.
get_prop(Elem, Name, Value) :-
Value := Elem[Name],
Value \== undefined.
get_attr(Elem, Name, Value) :-
get_prop(Elem, Name, Value).
%! remove(+Elem) is det.
%
% Remove an element from the DOM tree.
remove(Elem) :-
_ := Elem.remove().
%! create(TagName, Elem) is det.
%
% Create a node from TagName and make it available as Elem.
create(TagName, Elem) :-
Elem := document.createElement(#TagName).
%! set_html(+Elem, +HTML:string) is det.
%
% Set the `innerHTML` of Elem.
set_html(Elem, HTML) :-
Elem.innerHTML := #HTML.
%! add_class(Elem, Class) is det.
%
% Add classes to a Elem. Class is either a list of classes or an atom
% (or string) containing one or more classes separated by white space.
add_class(Elem, Class), is_list(Class) =>
maplist(atom_string, Class, Classes),
Add =.. [add|Classes],
_ := Elem.classList.Add.
add_class(Elem, Class) =>
split_string(Class, " \t\n", " \t\n", Classes),
Add =.. [add|Classes],
_ := Elem.classList.Add.
%! append_child(+Elem, +Child) is det.
%
% Add Child as a child to Elem.
append_child(Elem, Child) :-
_ := Elem.appendChild(Child).
%! parent_of(?Child, ?Parent) is nondet.
%
% True when Child is a direct Child of Parent. One of the arguments
% must be instantiated.
parent_of(Child, Parent), nonvar(Child) =>
Parent := Child.parent.
parent_of(Child, Parent), nonvar(Parent) =>
Children := Parent.children.toList(),
member(Child, Children).
%! bind(+Elem, +EventType, -Event, :Goal)
%
% Bind EventType on Elem to call Goal. If Event appears in Goal is is
% bound to the current event.
bind(Elem, On, Ev, Goal) :-
term_string(Goal, String, [variable_names(['Event__'=Ev])]),
_ := prolog.bind(Elem, #On, String).
|
