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confirmClose.js
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confirmClose.js
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/*!
* JavaScript for Special:Preferences: Enable save button and prevent the window being accidentally
* closed when any form field is changed.
*/
( function () {
$( () => {
// Check if all of the form values are unchanged.
// (This function could be changed to infuse and check OOUI widgets, but that would only make it
// slower and more complicated. It works fine to treat them as HTML elements.)
function isPrefsChanged() {
// eslint-disable-next-line no-jquery/no-sizzle
const $inputs = $( '#mw-prefs-form :input[name]' );
for ( let index = 0; index < $inputs.length; index++ ) {
const input = $inputs[ index ];
const $input = $( input );
// Different types of inputs have different methods for accessing defaults
if ( $input.is( 'select' ) ) {
// <select> has the property defaultSelected for each option
for ( let optIndex = 0; optIndex < input.options.length; optIndex++ ) {
const opt = input.options[ optIndex ];
if ( opt.selected !== opt.defaultSelected ) {
return true;
}
}
} else if ( $input.is( 'input' ) || $input.is( 'textarea' ) ) {
// <input> has defaultValue or defaultChecked
const inputType = input.type;
if ( inputType === 'radio' || inputType === 'checkbox' ) {
if ( input.checked !== input.defaultChecked ) {
return true;
}
} else if ( input.value !== input.defaultValue ) {
return true;
}
}
}
return false;
}
const saveButton = OO.ui.infuse( $( '#prefcontrol' ) );
// Disable the button to save preferences unless preferences have changed
// Check if preferences have been changed before JS has finished loading
saveButton.setDisabled( !isPrefsChanged() );
// Attach capturing event handlers to the document, to catch events inside OOUI dropdowns:
// * Use capture because OO.ui.SelectWidget also does, and it stops event propagation,
// so the event is not fired on descendant elements
// * Attach to the document because the dropdowns are in the .oo-ui-defaultOverlay element
// (and it doesn't exist yet at this point, so we can't attach them to it)
[ 'change', 'keyup', 'mouseup' ].forEach( ( eventType ) => {
document.addEventListener( eventType, () => {
// Make sure SelectWidget's event handlers run first
setTimeout( () => {
saveButton.setDisabled( !isPrefsChanged() );
} );
}, true );
} );
// Prompt users if they try to leave the page without saving.
const allowCloseWindow = mw.confirmCloseWindow( {
test: isPrefsChanged
} );
$( '#mw-prefs-form' ).on( 'submit', allowCloseWindow.release );
} );
}() );

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