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cond-state.js
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cond-state.js
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/*
* HTMLForm enhancements:
* Set up 'hide-if' and 'disable-if' behaviors for form fields that have them.
*/
/**
* Helper function for conditional states to find the nearby form field.
*
* Find the closest match for the given name, "closest" being the minimum
* level of parents to go to find a form field matching the given name or
* ending in array keys matching the given name (e.g. "baz" matches
* "foo[bar][baz]").
*
* @ignore
* @private
* @param {jQuery} $root
* @param {string} name
* @return {jQuery|null}
*/
function conditionGetField( $root, name ) {
const nameFilter = function () {
return this.name === name;
};
let $found = $root.find( '[name]' ).filter( nameFilter );
if ( !$found.length ) {
// Field cloner can load from template dynamically and fire event on sub element
$found = $root.closest( 'form' ).find( '[name]' ).filter( nameFilter );
}
return $found.length ? $found : null;
}
/**
* Helper function to get the OOUI widget containing the given field, if any.
*
* @ignore
* @private
* @param {jQuery} $field
* @return {OO.ui.Widget|null}
*/
function getWidget( $field ) {
const $widget = $field.closest( '.oo-ui-widget[data-ooui]' );
if ( $widget.length ) {
return OO.ui.Widget.static.infuse( $widget );
}
return null;
}
/**
* Helper function for conditional states to return a test function and list of
* dependent fields for a conditional states specification.
*
* @ignore
* @private
* @param {jQuery} $root
* @param {Array} spec
* @return {Array}
* @return {Array} return.0 Dependent fields, array of jQuery objects
* @return {Function} return.1 Test function
*/
function conditionParse( $root, spec ) {
let v, fields, func;
const op = spec[ 0 ];
let l = spec.length;
switch ( op ) {
case 'AND':
case 'OR':
case 'NAND':
case 'NOR': {
const funcs = [];
fields = [];
for ( let i = 1; i < l; i++ ) {
if ( !Array.isArray( spec[ i ] ) ) {
throw new Error( op + ' parameters must be arrays' );
}
v = conditionParse( $root, spec[ i ] );
fields = fields.concat( v[ 0 ] );
funcs.push( v[ 1 ] );
}
l = funcs.length;
const valueChk = { AND: false, OR: true, NAND: false, NOR: true };
const valueRet = { AND: true, OR: false, NAND: false, NOR: true };
func = function () {
for ( let j = 0; j < l; j++ ) {
if ( valueChk[ op ] === funcs[ j ]() ) {
return !valueRet[ op ];
}
}
return valueRet[ op ];
};
return [ fields, func ];
}
case 'NOT':
if ( l !== 2 ) {
throw new Error( 'NOT takes exactly one parameter' );
}
if ( !Array.isArray( spec[ 1 ] ) ) {
throw new Error( 'NOT parameters must be arrays' );
}
v = conditionParse( $root, spec[ 1 ] );
fields = v[ 0 ];
func = v[ 1 ];
return [ fields, function () {
return !func();
} ];
case '===':
case '!==': {
if ( l !== 3 ) {
throw new Error( op + ' takes exactly two parameters' );
}
const $field = conditionGetField( $root, spec[ 1 ] );
if ( !$field ) {
return [ [], function () {
return false;
} ];
}
v = spec[ 2 ];
let widget;
const getVal = function () {
// When the value is requested for the first time,
// determine if we need to treat this field as a OOUI widget.
if ( widget === undefined ) {
widget = getWidget( $field );
}
if ( widget ) {
if ( widget.supports( 'isSelected' ) ) {
const selected = widget.isSelected();
return selected ? widget.getValue() : '';
} else {
return widget.getValue();
}
} else {
if ( $field.prop( 'type' ) === 'radio' || $field.prop( 'type' ) === 'checkbox' ) {
const $selected = $field.filter( ':checked' );
return $selected.length ? $selected.val() : '';
} else {
return $field.val();
}
}
};
switch ( op ) {
case '===':
func = function () {
return getVal() === v;
};
break;
case '!==':
func = function () {
return getVal() !== v;
};
break;
}
return [ [ $field ], func ];
}
default:
throw new Error( 'Unrecognized operation \'' + op + '\'' );
}
}
/**
* Helper function to get the list of ResourceLoader modules needed to infuse the OOUI widgets
* containing the given fields.
*
* @ignore
* @private
* @param {jQuery} $fields
* @return {string[]}
*/
function gatherOOUIModules( $fields ) {
const $oouiFields = $fields.filter( '[data-ooui]' );
const modules = [];
if ( $oouiFields.length ) {
modules.push( 'mediawiki.htmlform.ooui' );
$oouiFields.each( function () {
const data = $( this ).data( 'mw-modules' );
if ( data ) {
// We can trust this value, 'data-mw-*' attributes are banned from user content in Sanitizer
const extraModules = data.split( ',' );
modules.push( ...extraModules );
}
} );
}
return modules;
}
mw.hook( 'htmlform.enhance' ).add( ( $root ) => {
const $exclude = $root.find( '.mw-htmlform-autoinfuse-lazy' )
.find( '.mw-htmlform-hide-if, .mw-htmlform-disable-if' );
const $fields = $root.find( '.mw-htmlform-hide-if, .mw-htmlform-disable-if' ).not( $exclude );
// Load modules for the fields we will hide/disable
mw.loader.using( gatherOOUIModules( $fields ) ).done( () => {
$fields.each( function () {
const $el = $( this );
let spec, $elOrLayout, $form;
if ( $el.is( '[data-ooui]' ) ) {
// $elOrLayout should be a FieldLayout that mixes in mw.htmlform.Element
$elOrLayout = OO.ui.FieldLayout.static.infuse( $el );
$form = $elOrLayout.$element.closest( 'form' );
spec = $elOrLayout.condState;
} else {
$elOrLayout = $el;
$form = $el.closest( 'form' );
spec = $el.data( 'condState' );
}
if ( !spec ) {
return;
}
let fields = [];
const test = {};
[ 'hide', 'disable' ].forEach( ( type ) => {
if ( spec[ type ] ) {
const v = conditionParse( $form, spec[ type ] );
fields = fields.concat( fields, v[ 0 ] );
test[ type ] = v[ 1 ];
}
} );
const func = function () {
const shouldHide = spec.hide ? test.hide() : false;
const shouldDisable = shouldHide || ( spec.disable ? test.disable() : false );
if ( spec.hide ) {
// Remove server-side CSS class that hides the elements, and re-compute the state
if ( $elOrLayout instanceof $ ) {
$elOrLayout.removeClass( 'mw-htmlform-hide-if-hidden' );
} else {
$elOrLayout.$element.removeClass( 'mw-htmlform-hide-if-hidden' );
}
// The .toggle() method works mostly the same for jQuery objects and OO.ui.Widget
$elOrLayout.toggle( !shouldHide );
}
// Disable fields with either 'disable-if' or 'hide-if' rules
// Hidden fields should be disabled to avoid users meet validation failure on these fields,
// because disabled fields will not be submitted with the form.
if ( $elOrLayout instanceof $ ) {
// This also finds elements inside any nested fields (in case of HTMLFormFieldCloner),
// which is problematic. But it works because:
// * HTMLFormFieldCloner::createFieldsForKey() copies '*-if' rules to nested fields
// * jQuery collections like $fields are in document order, so we register event
// handlers for parents first
// * Event handlers are fired in the order they were registered, so even if the handler
// for parent messed up the child, the handle for child will run next and fix it
$elOrLayout.find( 'input, textarea, select' ).each( function () {
const $this = $( this );
if ( shouldDisable ) {
if ( $this.data( 'was-disabled' ) === undefined ) {
$this.data( 'was-disabled', $this.prop( 'disabled' ) );
}
$this.prop( 'disabled', true );
} else {
$this.prop( 'disabled', $this.data( 'was-disabled' ) );
}
} );
} else {
// $elOrLayout is a OO.ui.FieldLayout
if ( shouldDisable ) {
if ( $elOrLayout.wasDisabled === undefined ) {
$elOrLayout.wasDisabled = $elOrLayout.fieldWidget.isDisabled();
}
$elOrLayout.fieldWidget.setDisabled( true );
} else if ( $elOrLayout.wasDisabled !== undefined ) {
$elOrLayout.fieldWidget.setDisabled( $elOrLayout.wasDisabled );
}
}
};
const oouiNodes = fields.map(
// We expect undefined for non-OOUI nodes (T308626)
( $node ) => $node.closest( '.oo-ui-fieldLayout[data-ooui]' )[ 0 ]
).filter(
// Remove undefined
( node ) => !!node
);
// Load modules for the fields whose state we will check
mw.loader.using( gatherOOUIModules( $( oouiNodes ) ) ).done( () => {
for ( let i = 0; i < fields.length; i++ ) {
const widget = getWidget( fields[ i ] );
if ( widget ) {
fields[ i ] = widget;
}
// The .on() method works mostly the same for jQuery objects and OO.ui.Widget
fields[ i ].on( 'change', func );
}
func();
} );
} );
} );
} );

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