MediaWiki:Edittools.js

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// <source lang="javascript">

/*
	EditTools support: add a selector, change into true buttons, enable for all text input fields
	The special characters to insert are defined at [[MediaWiki:Edittools]].
*/

// Globals: getElementsByClassName, hookEvent, addEvent (from wikibits.js)

if ( load_edittools == true ) { // Legacy. Do we really need this?
	if ( typeof( EditTools_set_focus ) == 'undefined' ) {
		var EditTools_set_focus = true;
	}

	if ( typeof( EditTools_set_focus_initially ) == 'undefined' ) {
		var EditTools_set_focus_initially = EditTools_set_focus;
	}

	if ( typeof( EditTools_initial_subset ) == 'undefined' ) {
		var EditTools_initial_subset = 0;
	}

	var EditTools = {
		createSelector: function() {
			var spec = document.getElementById( 'specialchars' );
			if ( !spec ) {
				return;
			}
			var sb = getElementsByClassName( spec, 'p', 'specialbasic' );
			if ( sb.length <= 1 ) {
				return; // Only care if there is more than one
			}

			var sel = document.createElement( 'select' );
			sel.style.display = 'inline';
			// sel.setAttribute( 'onchange', 'EditTools.chooseCharSubset( selectedIndex, true );' );
			// Apparently, this doesn't work on IE6. Use an explicit event handling function instead:
			sel.onchange = EditTools.handleOnchange;

			var initial = EditTools_initial_subset;
			if ( isNaN( initial ) || initial < 0 || initial >= sb.length ) {
				initial = 0;
			}

			for ( var i = 0; i < sb.length; i++ ) {
				var o = document.createElement( 'option' );
				// Ugh. We have encoded Unicode characters in the names...
				var id = sb[i].id.replace( /.([0-9A-F][0-9A-F])/g, '%$1' ).replace( /_/g, ' ' );
				if ( i == initial ) {
					o.selected = 'selected';
				}
				o.appendChild( document.createTextNode( decodeURIComponent( id ) ) );
				sel.appendChild( o );
			}

			spec.insertBefore( sel, spec.firstChild );

			EditTools.chooseCharSubset(
				initial,
				( wgAction != 'submit' ) &&
				EditTools_set_focus_initially &&
				( wgCanonicalNamespace != 'Special' || wgCanonicalSpecialPageName != 'Upload' )
			);
		},

		handleOnchange: function( evt ) {
			var e    = evt || window.event;      // W3C, IE
			var node = e.target || e.srcElement; // W3C, IE

			EditTools.chooseCharSubset( node.selectedIndex, true );
			return true;
		},

		chooseCharSubset: function( selected, set_focus ) {
			var sb = getElementsByClassName( document.getElementById( 'specialchars' ), 'p', 'specialbasic' );
			EditTools.makeButtons( sb[selected] );
			for ( var i = 0; i < sb.length; i++ ) {
				sb[i].style.display = i == selected ? 'inline' : 'none';
			}
			if ( set_focus && EditTools_set_focus ) {
				var txtarea = EditTools.getTextArea();
				if ( txtarea ) {
					txtarea.focus();
				}
			}
		},

		fixateWidth: function() {
			var edit_bar = document.getElementById( 'specialchars' );
			if ( !edit_bar ) {
				return;
			}
			// Try to fixate the width of that bar, otherwise IE6 may make it wider, which will lead to
			// a table re-layout on the upload form resulting in the right column extending beyond the
			// right edge of the window.
			edit_bar.setAttribute( 'width', '' + ( edit_bar.clientWidth || edit_bar.offsetWidth ) );
			edit_bar.style.maxWidth = '' + ( edit_bar.clientWidth || edit_bar.offsetWidth ) + 'px';
			// If we're inside a table, fixate the containing table cell, too.
			var parent = edit_bar.parentNode;
			while ( parent && parent != document.body && parent.nodeName.toLowerCase() != 'td' ) {
				parent = parent.parentNode;
			}
			if ( parent && parent != document.body ) {
				parent.setAttribute( 'width', '' + ( parent.clientWidth || parent.offsetWidth ) );
				parent.style.maxWidth = '' + ( parent.clientWidth || parent.offsetWidth ) + 'px';
			}
		},

		makeButtons: function( section ) {
			var edit_bar = section || document.getElementById( 'specialchars' );
			if ( !edit_bar ) {
				return;
			}
			var links = edit_bar.getElementsByTagName( 'a' );
			// 'links' is a *live* collection!
			var b = null;
			while ( links.length ) {
				b = document.createElement( 'input' );
				b.type = 'button';
				b.style.fontSize = '0.9em';
				b.style.paddingLeft = '1px';
				b.style.paddingRight = '1px';
				b.style.marginLeft = '1px';
				b.onclick = links[0].onclick;
				b.value = links[0].firstChild.data;
				var parent = links[0].parentNode;
				parent.replaceChild( b, links[0] ); // This removes links[0] from links!
				b.blur(); // IE6 insists on marking some buttons as having the focus...
				var margin_added = false;
				// Remove text nodes (nodeType == Node.TEXT_NODE, but IE6 doesn't know that...)
				// Insert some spacing where desired.
				while ( b.nextSibling && b.nextSibling.nodeType == 3 ) {
					if ( !margin_added && b.nextSibling.data.search( /\S/ ) >= 0 ) {
						b.style.marginRight = '4px';
						margin_added = true;
					}
					parent.removeChild( b.nextSibling );
				}
			}
		},

		enableForAllFields: function() {
			if ( typeof( insertTags ) != 'function' ) {
				return;
			}
			// insertTags from the site-wide /skins-1.5/common/edit.js just inserts in the first
			// textarea in the document. Evidently, that's not good if we have multiple textareas.
			// My first idea was to simply add a hidden textarea as the first one, and redefine
			// insertTags such that it copied first the last active textareas contents over to that hidden
			// field, set the cursor or selection there, let the standard insertTags do its thing, and
			// then copy the hidden field's text, cursor position and selection back to the currently
			// active field. Unfortunately, that is just as complex as simply copying the whole code
			// from wikibits to here and let it work on the right text field in the first place.
			var texts = document.getElementsByTagName( 'textarea' );
			for ( var i = 0; i < texts.length; i++ ) {
				$( texts[i] ).focus( EditTools.registerTextField );
			}
			// While we're at it, also enable it for input fields
			texts = document.getElementsByTagName( 'input' );
			for ( var i = 0; i < texts.length; i++ ) {
				if ( texts[i].type == 'text' ) {
					$( texts[i] ).focus( EditTools.registerTextField );
				}
			}
			insertTags = EditTools.insertTags; // Redefine the global insertTags
		},

		last_active_textfield: null,

		registerTextField: function( evt ) {
			var e = evt || window.event;
			var node = e.target || e.srcElement;
			if ( !node ) {
				return;
			}
			EditTools.last_active_textfield = node.id;
			return true;
		},

		getTextArea: function() {
			var txtarea = null;
			if ( EditTools.last_active_textfield && EditTools.last_active_textfield != '' )
				txtarea = document.getElementById( EditTools.last_active_textfield );
				if ( !txtarea ) {
					// Fallback option: old behaviour
					if ( document.editform ) {
						txtarea = document.editform.wpTextbox1;
					} else {
						// Some alternate form? Take the first one we can find
						txtarea = document.getElementsByTagName( 'textarea' );
						if ( txtarea.length > 0 ) {
							txtarea = txtarea[0];
						} else {
							txtarea = null;
						}
					}
			}
			return txtarea;
		},

		insertTags: function( tagOpen, tagClose, sampleText ) {
			/* Usability initiative compatibility */
			if ( typeof $j != 'undefined' && typeof $j.fn.textSelection != 'undefined' ) {
				$j( '#wpTextbox1' ).textSelection(
					'encapsulateSelection', { 'pre': tagOpen, 'peri': sampleText, 'post': tagClose }
				);
				return;
			}
			var txtarea = EditTools.getTextArea ();
			if ( !txtarea ) {
				return;
			}
			var selText, isSample = false;

			function checkSelectedText() {
				if ( !selText ) {
					selText = sampleText;
					isSample = true;
				} else if ( selText.charAt( selText.length - 1 ) == ' ' ) { // Exclude ending space char
					selText = selText.substring( 0, selText.length - 1 );
					tagClose += ' ';
				}
			}

			if ( document.selection && document.selection.createRange ) { // IE/Opera
				// Save window scroll position
				var winScroll = 0;
				if ( document.documentElement && document.documentElement.scrollTop ) {
					winScroll = document.documentElement.scrollTop;
				} else if ( document.body ) {
					winScroll = document.body.scrollTop;
				}
				// Get current selection
				txtarea.focus();
				var range = document.selection.createRange();
				selText = range.text;
				// Insert tags
				checkSelectedText ();
				range.text = tagOpen + selText + tagClose;
				// Mark sample text as selected
				if ( isSample && range.moveStart ) {
					if ( window.opera ) {
						tagClose = tagClose.replace( /\n/g, '' );
					}
					range.moveStart( 'character', - tagClose.length - selText.length );
					range.moveEnd( 'character', - tagClose.length );
				}
				range.select();
				// Restore window scroll position
				if ( document.documentElement && document.documentElement.scrollTop ) {
					document.documentElement.scrollTop = winScroll;
				} else if ( document.body ) {
					document.body.scrollTop = winScroll;
				}
			} else if ( txtarea.selectionStart || txtarea.selectionStart == '0' ) { // Mozilla
				// Save textarea scroll position
				var textScroll = txtarea.scrollTop;
				// Get current selection
				txtarea.focus();
				var startPos = txtarea.selectionStart;
				var endPos   = txtarea.selectionEnd;
				selText = txtarea.value.substring( startPos, endPos );
				// Insert tags
				checkSelectedText();
				txtarea.value = txtarea.value.substring( 0, startPos ) +
						tagOpen + selText + tagClose +
						txtarea.value.substring( endPos );
				// Set new selection
				if ( isSample ) {
					txtarea.selectionStart = startPos + tagOpen.length;
					txtarea.selectionEnd = startPos + tagOpen.length + selText.length;
				} else {
					txtarea.selectionStart = startPos + tagOpen.length + selText.length + tagClose.length;
					txtarea.selectionEnd = txtarea.selectionStart;
				}
				// Restore textarea scroll position
				txtarea.scrollTop = textScroll;
			}
		}, // end insertTags

		setup: function() {
			EditTools.fixateWidth();
			EditTools.createSelector();
			EditTools.enableForAllFields();
		}

	} // end EditTools

	// Do not use addOnloadHook; it runs *before* the onload event fires. At that time, onclick or
	// onfocus handlers may not yet be set up properly.
	hookEvent( 'load', EditTools.setup );

} // end if

// </source>