.. Copyright (C) 2016 Champs Libres Cooperative SCRLFS
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License".
Javascript functions
####################
Some function may be useful to manipulate elements on the page.
Show-hide elements according to a form state
*********************************************
The module ``ShowHide`` will allow you to show/hide part of your page using a specific test.
This must be use inside a javascript module.
Usage
=====
In this module, the module will listen to all input given in the ``container_from`` div, and will show or hide the content of the ``container_target`` according to the result of the ``test`` function.
.. code-block:: html+twig
{{ form_row(form.accompagnementRQTHDate) }}
{{ form_row(form.accompagnementComment) }}
.. code-block:: javascript
import { ShowHide } from 'ShowHide/show_hide.js';
var
from = document.getElementById("container_from"),
target = document.getElementById("container_target")
;
new ShowHide({
froms: [from], // the value of from should be an iterable
container: [target], // the value of container should be an iterable
test: function(froms, event) {
// iterate over each element of froms
for (let f of froms.values()) {
// get all input inside froms
for (let input of f.querySelectorAll('input').values()) {
if (input.value === 'autre') {
return input.checked;
}
}
}
return false;
}
});
Once instantiated, the class ``ShowHide`` will:
1. get all input from each element inside the ``froms`` values
2. attach an event listener (by default, ``change``) to each input inside each entry in ``froms``
3. each time the event is fired, launch the function ``test``
4. show the element in the container given in ``container``, if the result of ``test`` is true, or hide them otherwise.
The test is also launched when the page is loaded.
Show/hide while the user enter data: using the ``input`` event
==============================================================
One can force to use another event on the input elements, instead of the default ``'change'`` event.
For achieving this, use the `event_name` option.
.. code-block:: javascript
new ShowHide({
froms: froms,
test: test_function,
container: containers ,
// using this option, we use the event `input` instead of `change`
event_name: 'input'
});
Examples
--------
.. literalinclude:: js-functions/show_hide.js
:language: javascript
Using Show/Hide in collections forms
====================================
Using show / hide in collection forms implies:
* to launch show/hide manually for each entry when the page is loaded ;
* to catch when an entry is added to the form ;
As the show/hide is started manually and not on page load, we add the option ``load_event: null`` to the options:
.. code-block:: javascript
new ShowHide({
load_event: null,
froms: [ from ],
container: [ container ],
test: my_test_function
});
.. note::
When using ``load_event: null`` inside the options, the value of event will be ``null`` as second argument for the test function.
.. code-block:: javascript
my_test_function(froms, event) {
// event will be null on first launch
}
Example usage: here, we would like to catch for element inside a CV form, where the user may add multiple formation entries.
.. code-block:: javascript
import { ShowHide } from 'ShowHide/show_hide.js';
// we factorize the creation of show hide element in this function.
var make_show_hide = function(entry) {
let
obtained = entry.querySelector('[data-diploma-obtained]'),
reconnue = entry.querySelector('[data-diploma-reconnue]')
;
new ShowHide({
load_event: null,
froms: [ obtained ],
container: [ reconnue ],
test: my_test_function
});
};
// this code is fired when an entry is added on the page
window.addEventListener('collection-add-entry', function(e) {
// if the form contains multiple collection, we filter them here:
if (e.detail.collection.dataset.collectionName === 'formations') {
make_show_hide(e.detail.entry);
}
});
// on page load, we create a show/hide
window.addEventListener('load', function(_e) {
let
formations = document.querySelectorAll('[data-formation-entry]')
;
for (let f of formations.values()) {
make_show_hide(f);
}
});
Handling encapsulated show/hide elements
========================================
This module allow to handle encapsulated show/hide elements. For instance :
* in a first checkbox list, a second checkbox list is shown if some element is checked ;
* in this second checkbox list, a third input is shown if some element is checked inside the second checkbox list.
As a consequence, if the given element in the first checkbox list is unchecked, the third input must also be hidden.
Example: when a situation professionnelle is ``en activite``, the second element ``type contrat`` must be shown if ``en_activite`` is checked. Inside ``type_contrat``, ``type_contrat_aide`` should be shown when ``contrat_aide`` is checked.
.. code-block:: html
The JS code will be:
.. code-block:: javascript
import { ShowHide } from 'ShowHide/show_hide.js';
// we search for the element within the DOM
// NOTE: all the elements should be searched before instanciating the showHides.
// if not, the elements **may** have disappeared from the DOM
var
situation_prof = document.getElementById('situation_prof'),
type_contrat = document.getElementById('type_contrat'),
type_contrat_aide = document.getElementById('type_contrat_aide'),
;
// the first show/hide will apply on situation_prof
new ShowHide({
// the id will help us to keep a track of the element
id: 'situation_prof_type_contrat',
froms: [situation_prof],
container: [type_contrat],
test: function(froms) {
for (let f of froms.values()) {
for (let input of f.querySelectorAll('input').values()) {
if (input.value === 'en_activite') {
return input.checked;
}
}
}
return false;
}
});
// the show/hide will apply on "contrat aide"
var show_hide_contrat_aide = new ShowHide({
froms: [type_contrat],
container: [type_contrat_aide],
test: function(froms) {
for (let f of froms.values()) {
for (let input of f.querySelectorAll('input').values()) {
if (input.value === 'contrat_aide') {
return input.checked;
}
}
}
return false;
}
});
// we handle here the case when the first show-hide is changed: the third input must also disappears
window.addEventListener('show-hide-hide', function (e) {
if (e.detail.id = 'situation_prof_type_contrat') {
// we force the 3rd element to disappears
show_hide_contrat_aide.forceHide();
}
});
// when the first show-hide is changed, it makes appears the second one.
// we check here that the second show-hide is processed.
window.addEventListener('show-hide-show', function (e) {
if (e.detail.id = 'situation_prof_type_contrat') {
show_hide_contrat_aide.forceCompute();
}
});