resources/src/mediawiki.action/mediawiki.action.edit.preview.js

   1 /*!
   2  * Live edit preview.
   3  */
   4 ( function () {
   5
   6         /**
   7          * @ignore
   8          * @param {jQuery.Event} e
   9          */
  10         function doLivePreview( e ) {
  11                 var isDiff, api, parseRequest, diffRequest, postData, copySelectors, section, summary,
  12                         $wikiPreview, $wikiDiff, $editform, $textbox, $copyElements, $spinner, $errorBox;
  13
  14                 isDiff = ( e.target.name === 'wpDiff' );
  15                 $wikiPreview = $( '#wikiPreview' );
  16                 $wikiDiff = $( '#wikiDiff' );
  17                 $editform = $( '#editform' );
  18                 $textbox = $editform.find( '#wpTextbox1' );
  19
  20                 summary = OO.ui.infuse( $( '#wpSummaryWidget' ) );
  21
  22                 $spinner = $( '.mw-spinner-preview' );
  23                 $errorBox = $( '.errorbox' );
  24                 section = $editform.find( '[name="wpSection"]' ).val();
  25
  26                 if ( $textbox.length === 0 ) {
  27                         return;
  28                 }
  29                 // Show changes for a new section is not yet supported
  30                 if ( isDiff && section === 'new' ) {
  31                         return;
  32                 }
  33                 e.preventDefault();
  34
  35                 // Remove any previously displayed errors
  36                 $errorBox.remove();
  37                 // Show #wikiPreview if it's hidden to be able to scroll to it
  38                 // (if it is hidden, it's also empty, so nothing changes in the rendering)
  39                 $wikiPreview.show();
  40
  41                 // Jump to where the preview will appear
  42                 $wikiPreview[ 0 ].scrollIntoView();
  43
  44                 copySelectors = [
  45                         // Main
  46                         '.mw-indicators',
  47                         '#firstHeading',
  48                         '#wikiPreview',
  49                         '#wikiDiff',
  50                         '#catlinks',
  51                         '#p-lang',
  52                         // Editing-related
  53                         '.templatesUsed',
  54                         '.limitreport',
  55                         '.mw-summary-preview'
  56                 ];
  57                 $copyElements = $( copySelectors.join( ',' ) );
  58
  59                 // Not shown during normal preview, to be removed if present
  60                 $( '.mw-newarticletext' ).remove();
  61
  62                 if ( $spinner.length === 0 ) {
  63                         $spinner = $.createSpinner( {
  64                                 size: 'large',
  65                                 type: 'block'
  66                         } )
  67                                 .addClass( 'mw-spinner-preview' )
  68                                 .css( 'margin-top', '1em' );
  69                         $wikiPreview.before( $spinner );
  70                 } else {
  71                         $spinner.show();
  72                 }
  73
  74                 // Can't use fadeTo because it calls show(), and we might want to keep some elements hidden
  75                 // (e.g. empty #catlinks)
  76                 // FIXME: Use CSS transition
  77                 // eslint-disable-next-line jquery/no-animate
  78                 $copyElements.animate( { opacity: 0.4 }, 'fast' );
  79
  80                 api = new mw.Api();
  81                 postData = {
  82                         formatversion: 2,
  83                         action: 'parse',
  84                         title: mw.config.get( 'wgPageName' ),
  85                         summary: summary.getValue(),
  86                         prop: ''
  87                 };
  88
  89                 if ( isDiff ) {
  90                         $wikiPreview.hide();
  91
  92                         if ( postData.summary ) {
  93                                 parseRequest = api.post( postData );
  94                         }
  95
  96                         diffRequest = api.post( {
  97                                 formatversion: 2,
  98                                 action: 'query',
  99                                 prop: 'revisions',
 100                                 titles: mw.config.get( 'wgPageName' ),
 101                                 rvdifftotext: $textbox.textSelection( 'getContents' ),
 102                                 rvdifftotextpst: true,
 103                                 rvprop: '',
 104                                 rvsection: section === '' ? undefined : section,
 105                                 uselang: mw.config.get( 'wgUserLanguage' )
 106                         } );
 107
 108                         // Wait for the summary before showing the diff so the page doesn't jump twice
 109                         $.when( diffRequest, parseRequest ).done( function ( response ) {
 110                                 var diffHtml;
 111                                 try {
 112                                         diffHtml = response[ 0 ].query.pages[ 0 ]
 113                                                 .revisions[ 0 ].diff.body;
 114                                         $wikiDiff.find( 'table.diff tbody' ).html( diffHtml );
 115                                         mw.hook( 'wikipage.diff' ).fire( $wikiDiff.find( 'table.diff' ) );
 116                                 } catch ( err ) {
 117                                         // "result.blah is undefined" error, ignore
 118                                         mw.log.warn( err );
 119                                 }
 120                                 $wikiDiff.show();
 121                         } );
 122                 } else {
 123                         $wikiDiff.hide();
 124
 125                         $.extend( postData, {
 126                                 prop: 'text|indicators|displaytitle|modules|jsconfigvars|categorieshtml|templates|langlinks|limitreporthtml',
 127                                 text: $textbox.textSelection( 'getContents' ),
 128                                 pst: true,
 129                                 preview: true,
 130                                 sectionpreview: section !== '',
 131                                 disableeditsection: true,
 132                                 useskin: mw.config.get( 'skin' ),
 133                                 uselang: mw.config.get( 'wgUserLanguage' )
 134                         } );
 135                         if ( section === 'new' ) {
 136                                 postData.section = 'new';
 137                                 postData.sectiontitle = postData.summary;
 138                         }
 139
 140                         parseRequest = api.post( postData );
 141                         parseRequest.done( function ( response ) {
 142                                 var newList, $displaytitle, $content, $parent, $list;
 143                                 if ( response.parse.jsconfigvars ) {
 144                                         mw.config.set( response.parse.jsconfigvars );
 145                                 }
 146                                 if ( response.parse.modules ) {
 147                                         mw.loader.load( response.parse.modules.concat(
 148                                                 response.parse.modulescripts,
 149                                                 response.parse.modulestyles
 150                                         ) );
 151                                 }
 152
 153                                 newList = [];
 154                                 // eslint-disable-next-line jquery/no-each-util
 155                                 $.each( response.parse.indicators, function ( name, indicator ) {
 156                                         newList.push(
 157                                                 $( '<div>' )
 158                                                         .addClass( 'mw-indicator' )
 159                                                         .attr( 'id', mw.util.escapeIdForAttribute( 'mw-indicator-' + name ) )
 160                                                         .html( indicator )
 161                                                         .get( 0 ),
 162                                                 // Add a whitespace between the <div>s because
 163                                                 // they get displayed with display: inline-block
 164                                                 document.createTextNode( '\n' )
 165                                         );
 166                                 } );
 167                                 $( '.mw-indicators' ).empty().append( newList );
 168
 169                                 if ( response.parse.displaytitle ) {
 170                                         $displaytitle = $( $.parseHTML( response.parse.displaytitle ) );
 171                                         $( '#firstHeading' ).msg(
 172                                                 mw.config.get( 'wgEditMessage', 'editing' ),
 173                                                 $displaytitle
 174                                         );
 175                                         document.title = mw.msg(
 176                                                 'pagetitle',
 177                                                 mw.msg(
 178                                                         mw.config.get( 'wgEditMessage', 'editing' ),
 179                                                         $displaytitle.text()
 180                                                 )
 181                                         );
 182                                 }
 183                                 if ( response.parse.categorieshtml ) {
 184                                         $content = $( $.parseHTML( response.parse.categorieshtml ) );
 185                                         mw.hook( 'wikipage.categories' ).fire( $content );
 186                                         $( '.catlinks[data-mw="interface"]' ).replaceWith( $content );
 187                                 }
 188                                 if ( response.parse.templates ) {
 189                                         newList = response.parse.templates.map( function ( template ) {
 190                                                 return $( '<li>' )
 191                                                         .append( $( '<a>' )
 192                                                                 .attr( {
 193                                                                         href: mw.util.getUrl( template.title ),
 194                                                                         class: ( template.exists ? '' : 'new' )
 195                                                                 } )
 196                                                                 .text( template.title )
 197                                                         );
 198                                         } );
 199
 200                                         $editform.find( '.templatesUsed .mw-editfooter-list' ).detach().empty().append( newList ).appendTo( '.templatesUsed' );
 201                                 }
 202                                 if ( response.parse.limitreporthtml ) {
 203                                         $( '.limitreport' ).html( response.parse.limitreporthtml );
 204                                 }
 205                                 if ( response.parse.langlinks && mw.config.get( 'skin' ) === 'vector' ) {
 206                                         newList = response.parse.langlinks.map( function ( langlink ) {
 207                                                 var bcp47 = mw.language.bcp47( langlink.lang );
 208                                                 return $( '<li>' )
 209                                                         .addClass( 'interlanguage-link interwiki-' + langlink.lang )
 210                                                         .append( $( '<a>' )
 211                                                                 .attr( {
 212                                                                         href: langlink.url,
 213                                                                         title: langlink.title + ' - ' + langlink.langname,
 214                                                                         lang: bcp47,
 215                                                                         hreflang: bcp47
 216                                                                 } )
 217                                                                 .text( langlink.autonym )
 218                                                         );
 219                                         } );
 220                                         $list = $( '#p-lang ul' );
 221                                         $parent = $list.parent();
 222                                         $list.detach().empty().append( newList ).prependTo( $parent );
 223                                 }
 224
 225                                 if ( response.parse.text ) {
 226                                         $content = $wikiPreview.children( '.mw-content-ltr,.mw-content-rtl' );
 227                                         $content
 228                                                 .detach()
 229                                                 .html( response.parse.text );
 230
 231                                         mw.hook( 'wikipage.content' ).fire( $content );
 232
 233                                         // Reattach
 234                                         $wikiPreview.append( $content );
 235
 236                                         $wikiPreview.show();
 237                                 }
 238                         } );
 239                 }
 240                 $.when( parseRequest, diffRequest ).done( function ( parseResp ) {
 241                         var parse = parseResp && parseResp[ 0 ].parse,
 242                                 isSubject = ( section === 'new' ),
 243                                 summaryMsg = isSubject ? 'subject-preview' : 'summary-preview',
 244                                 $summaryPreview = $editform.find( '.mw-summary-preview' ).empty();
 245                         if ( parse && parse.parsedsummary ) {
 246                                 $summaryPreview.append(
 247                                         mw.message( summaryMsg ).parse(),
 248                                         ' ',
 249                                         $( '<span>' ).addClass( 'comment' ).html(
 250                                                 // There is no equivalent to rawParams
 251                                                 mw.message( 'parentheses' ).escaped()
 252                                                         // .replace() use $ as start of a pattern.
 253                                                         // $$ is the pattern for '$'.
 254                                                         // The inner .replace() duplicates any $ and
 255                                                         // the outer .replace() simplifies the $$.
 256                                                         .replace( '$1', parse.parsedsummary.replace( /\$/g, '$$$$' ) )
 257                                         )
 258                                 );
 259                         }
 260                         mw.hook( 'wikipage.editform' ).fire( $editform );
 261                 } ).always( function () {
 262                         $spinner.hide();
 263                         // FIXME: Use CSS transition
 264                         // eslint-disable-next-line jquery/no-animate
 265                         $copyElements.animate( {
 266                                 opacity: 1
 267                         }, 'fast' );
 268                 } ).fail( function ( code, result ) {
 269                         // This just shows the error for whatever request failed first
 270                         var errorMsg = 'API error: ' + code;
 271                         if ( code === 'http' ) {
 272                                 errorMsg = 'HTTP error: ';
 273                                 if ( result.exception ) {
 274                                         errorMsg += result.exception;
 275                                 } else {
 276                                         errorMsg += result.textStatus;
 277                                 }
 278                         }
 279                         $errorBox = $( '<div>' )
 280                                 .addClass( 'errorbox' )
 281                                 .html( '<strong>' + mw.message( 'previewerrortext' ).escaped() + '</strong><br>' )
 282                                 .append( document.createTextNode( errorMsg ) );
 283                         $wikiDiff.hide();
 284                         $wikiPreview.hide().before( $errorBox );
 285                 } );
 286         }
 287
 288         $( function () {
 289                 // Do not enable on user .js/.css pages, as there's no sane way of "previewing"
 290                 // the scripts or styles without reloading the page.
 291                 if ( $( '#mw-userjsyoucanpreview' ).length || $( '#mw-usercssyoucanpreview' ).length ) {
 292                         return;
 293                 }
 294
 295                 // The following elements can change in a preview but are not output
 296                 // by the server when they're empty until the preview response.
 297                 // TODO: Make the server output these always (in a hidden state), so we don't
 298                 // have to fish and (hopefully) put them in the right place (since skins
 299                 // can change where they are output).
 300
 301                 if ( !document.getElementById( 'p-lang' ) && document.getElementById( 'p-tb' ) && mw.config.get( 'skin' ) === 'vector' ) {
 302                         $( '.portal:last' ).after(
 303                                 $( '<div>' ).attr( {
 304                                         class: 'portal',
 305                                         id: 'p-lang',
 306                                         role: 'navigation',
 307                                         'aria-labelledby': 'p-lang-label'
 308                                 } )
 309                                         .append( $( '<h3>' ).attr( 'id', 'p-lang-label' ).text( mw.msg( 'otherlanguages' ) ) )
 310                                         .append( $( '<div>' ).addClass( 'body' ).append( '<ul>' ) )
 311                         );
 312                 }
 313
 314                 if ( !$( '.mw-summary-preview' ).length ) {
 315                         $( '#wpSummaryWidget' ).after(
 316                                 $( '<div>' ).addClass( 'mw-summary-preview' )
 317                         );
 318                 }
 319
 320                 if ( !document.getElementById( 'wikiDiff' ) && document.getElementById( 'wikiPreview' ) ) {
 321                         $( '#wikiPreview' ).after(
 322                                 $( '<div>' )
 323                                         .hide()
 324                                         .attr( 'id', 'wikiDiff' )
 325                                         .html( '<table class="diff"><col class="diff-marker"/><col class="diff-content"/>' +
 326                                                 '<col class="diff-marker"/><col class="diff-content"/><tbody/></table>' )
 327                         );
 328                 }
 329
 330                 // This should be moved down to '#editform', but is kept on the body for now
 331                 // because the LiquidThreads extension is re-using this module with only half
 332                 // the EditPage (doesn't include #editform presumably, T57463).
 333                 $( document.body ).on( 'click', '#wpPreview, #wpDiff', doLivePreview );
 334         } );
 335
 336 }() );