Fri, 20 Dec 2024 13:13:38 +0100
add advice to set the size of a buffer initialized with existing data
function convertToId(search) { var result = ''; for (i=0;i<search.length;i++) { var c = search.charAt(i); var cn = c.charCodeAt(0); if (c.match(/[a-z0-9\u0080-\uFFFF]/)) { result+=c; } else if (cn<16) { result+="_0"+cn.toString(16); } else { result+="_"+cn.toString(16); } } return result; } function getXPos(item) { var x = 0; if (item.offsetWidth) { while (item && item!=document.body) { x += item.offsetLeft; item = item.offsetParent; } } return x; } function getYPos(item) { var y = 0; if (item.offsetWidth) { while (item && item!=document.body) { y += item.offsetTop; item = item.offsetParent; } } return y; } /* A class handling everything associated with the search panel. Parameters: name - The name of the global variable that will be storing this instance. Is needed to be able to set timeouts. resultPath - path to use for external files */ function SearchBox(name, resultsPath, inFrame, label) { if (!name || !resultsPath) { alert("Missing parameters to SearchBox."); } // ---------- Instance variables this.name = name; this.resultsPath = resultsPath; this.keyTimeout = 0; this.keyTimeoutLength = 500; this.closeSelectionTimeout = 300; this.lastSearchValue = ""; this.lastResultsPage = ""; this.hideTimeout = 0; this.searchIndex = 0; this.searchActive = false; this.insideFrame = inFrame; this.searchLabel = label; // ----------- DOM Elements this.DOMSearchField = function() { return document.getElementById("MSearchField"); } this.DOMSearchSelect = function() { return document.getElementById("MSearchSelect"); } this.DOMSearchSelectWindow = function() { return document.getElementById("MSearchSelectWindow"); } this.DOMPopupSearchResults = function() { return document.getElementById("MSearchResults"); } this.DOMPopupSearchResultsWindow = function() { return document.getElementById("MSearchResultsWindow"); } this.DOMSearchClose = function() { return document.getElementById("MSearchClose"); } this.DOMSearchBox = function() { return document.getElementById("MSearchBox"); } // ------------ Event Handlers // Called when focus is added or removed from the search field. this.OnSearchFieldFocus = function(isActive) { this.Activate(isActive); } this.OnSearchSelectShow = function() { var searchSelectWindow = this.DOMSearchSelectWindow(); var searchField = this.DOMSearchSelect(); if (this.insideFrame) { var left = getXPos(searchField); var top = getYPos(searchField); left += searchField.offsetWidth + 6; top += searchField.offsetHeight; // show search selection popup searchSelectWindow.style.display='block'; left -= searchSelectWindow.offsetWidth; searchSelectWindow.style.left = left + 'px'; searchSelectWindow.style.top = top + 'px'; } else { var left = getXPos(searchField); var top = getYPos(searchField); top += searchField.offsetHeight; // show search selection popup searchSelectWindow.style.display='block'; searchSelectWindow.style.left = left + 'px'; searchSelectWindow.style.top = top + 'px'; } // stop selection hide timer if (this.hideTimeout) { clearTimeout(this.hideTimeout); this.hideTimeout=0; } return false; // to avoid "image drag" default event } this.OnSearchSelectHide = function() { this.hideTimeout = setTimeout(this.name +".CloseSelectionWindow()", this.closeSelectionTimeout); } // Called when the content of the search field is changed. this.OnSearchFieldChange = function(evt) { if (this.keyTimeout) // kill running timer { clearTimeout(this.keyTimeout); this.keyTimeout = 0; } var e = (evt) ? evt : window.event; // for IE if (e.keyCode==40 || e.keyCode==13) { if (e.shiftKey==1) { this.OnSearchSelectShow(); var win=this.DOMSearchSelectWindow(); for (i=0;i<win.childNodes.length;i++) { var child = win.childNodes[i]; // get span within a if (child.className=='SelectItem') { child.focus(); return; } } return; } else if (window.frames.MSearchResults.searchResults) { var elem = window.frames.MSearchResults.searchResults.NavNext(0); if (elem) elem.focus(); } } else if (e.keyCode==27) // Escape out of the search field { this.DOMSearchField().blur(); this.DOMPopupSearchResultsWindow().style.display = 'none'; this.DOMSearchClose().style.display = 'none'; this.lastSearchValue = ''; this.Activate(false); return; } // strip whitespaces var searchValue = this.DOMSearchField().value.replace(/ +/g, ""); if (searchValue != this.lastSearchValue) // search value has changed { if (searchValue != "") // non-empty search { // set timer for search update this.keyTimeout = setTimeout(this.name + '.Search()', this.keyTimeoutLength); } else // empty search field { this.DOMPopupSearchResultsWindow().style.display = 'none'; this.DOMSearchClose().style.display = 'none'; this.lastSearchValue = ''; } } } this.SelectItemCount = function(id) { var count=0; var win=this.DOMSearchSelectWindow(); for (i=0;i<win.childNodes.length;i++) { var child = win.childNodes[i]; // get span within a if (child.className=='SelectItem') { count++; } } return count; } this.SelectItemSet = function(id) { var i,j=0; var win=this.DOMSearchSelectWindow(); for (i=0;i<win.childNodes.length;i++) { var child = win.childNodes[i]; // get span within a if (child.className=='SelectItem') { var node = child.firstChild; if (j==id) { node.innerHTML='•'; } else { node.innerHTML=' '; } j++; } } } // Called when an search filter selection is made. // set item with index id as the active item this.OnSelectItem = function(id) { this.searchIndex = id; this.SelectItemSet(id); var searchValue = this.DOMSearchField().value.replace(/ +/g, ""); if (searchValue!="" && this.searchActive) // something was found -> do a search { this.Search(); } } this.OnSearchSelectKey = function(evt) { var e = (evt) ? evt : window.event; // for IE if (e.keyCode==40 && this.searchIndex<this.SelectItemCount()) // Down { this.searchIndex++; this.OnSelectItem(this.searchIndex); } else if (e.keyCode==38 && this.searchIndex>0) // Up { this.searchIndex--; this.OnSelectItem(this.searchIndex); } else if (e.keyCode==13 || e.keyCode==27) { this.OnSelectItem(this.searchIndex); this.CloseSelectionWindow(); this.DOMSearchField().focus(); } return false; } // --------- Actions // Closes the results window. this.CloseResultsWindow = function() { this.DOMPopupSearchResultsWindow().style.display = 'none'; this.DOMSearchClose().style.display = 'none'; this.Activate(false); } this.CloseSelectionWindow = function() { this.DOMSearchSelectWindow().style.display = 'none'; } // Performs a search. this.Search = function() { this.keyTimeout = 0; // strip leading whitespace var searchValue = this.DOMSearchField().value.replace(/^ +/, ""); var code = searchValue.toLowerCase().charCodeAt(0); var idxChar = searchValue.substr(0, 1).toLowerCase(); if ( 0xD800 <= code && code <= 0xDBFF && searchValue > 1) // surrogate pair { idxChar = searchValue.substr(0, 2); } var resultsPage; var resultsPageWithSearch; var hasResultsPage; var idx = indexSectionsWithContent[this.searchIndex].indexOf(idxChar); if (idx!=-1) { var hexCode=idx.toString(16); resultsPage = this.resultsPath + '/' + indexSectionNames[this.searchIndex] + '_' + hexCode + '.html'; resultsPageWithSearch = resultsPage+'?'+escape(searchValue); hasResultsPage = true; } else // nothing available for this search term { resultsPage = this.resultsPath + '/nomatches.html'; resultsPageWithSearch = resultsPage; hasResultsPage = false; } window.frames.MSearchResults.location = resultsPageWithSearch; var domPopupSearchResultsWindow = this.DOMPopupSearchResultsWindow(); if (domPopupSearchResultsWindow.style.display!='block') { var domSearchBox = this.DOMSearchBox(); this.DOMSearchClose().style.display = 'inline'; if (this.insideFrame) { var domPopupSearchResults = this.DOMPopupSearchResults(); domPopupSearchResultsWindow.style.position = 'relative'; domPopupSearchResultsWindow.style.display = 'block'; var width = document.body.clientWidth - 8; // the -8 is for IE :-( domPopupSearchResultsWindow.style.width = width + 'px'; domPopupSearchResults.style.width = width + 'px'; } else { var domPopupSearchResults = this.DOMPopupSearchResults(); var left = getXPos(domSearchBox) + 150; // domSearchBox.offsetWidth; var top = getYPos(domSearchBox) + 20; // domSearchBox.offsetHeight + 1; domPopupSearchResultsWindow.style.display = 'block'; left -= domPopupSearchResults.offsetWidth; domPopupSearchResultsWindow.style.top = top + 'px'; domPopupSearchResultsWindow.style.left = left + 'px'; } } this.lastSearchValue = searchValue; this.lastResultsPage = resultsPage; } // -------- Activation Functions // Activates or deactivates the search panel, resetting things to // their default values if necessary. this.Activate = function(isActive) { if (isActive || // open it this.DOMPopupSearchResultsWindow().style.display == 'block' ) { this.DOMSearchBox().className = 'MSearchBoxActive'; var searchField = this.DOMSearchField(); if (searchField.value == this.searchLabel) // clear "Search" term upon entry { searchField.value = ''; this.searchActive = true; } } else if (!isActive) // directly remove the panel { this.DOMSearchBox().className = 'MSearchBoxInactive'; this.DOMSearchField().value = this.searchLabel; this.searchActive = false; this.lastSearchValue = '' this.lastResultsPage = ''; } } } // ----------------------------------------------------------------------- // The class that handles everything on the search results page. function SearchResults(name) { // The number of matches from the last run of <Search()>. this.lastMatchCount = 0; this.lastKey = 0; this.repeatOn = false; // Toggles the visibility of the passed element ID. this.FindChildElement = function(id) { var parentElement = document.getElementById(id); var element = parentElement.firstChild; while (element && element!=parentElement) { if (element.nodeName == 'DIV' && element.className == 'SRChildren') { return element; } if (element.nodeName == 'DIV' && element.hasChildNodes()) { element = element.firstChild; } else if (element.nextSibling) { element = element.nextSibling; } else { do { element = element.parentNode; } while (element && element!=parentElement && !element.nextSibling); if (element && element!=parentElement) { element = element.nextSibling; } } } } this.Toggle = function(id) { var element = this.FindChildElement(id); if (element) { if (element.style.display == 'block') { element.style.display = 'none'; } else { element.style.display = 'block'; } } } // Searches for the passed string. If there is no parameter, // it takes it from the URL query. // // Always returns true, since other documents may try to call it // and that may or may not be possible. this.Search = function(search) { if (!search) // get search word from URL { search = window.location.search; search = search.substring(1); // Remove the leading '?' search = unescape(search); } search = search.replace(/^ +/, ""); // strip leading spaces search = search.replace(/ +$/, ""); // strip trailing spaces search = search.toLowerCase(); search = convertToId(search); var resultRows = document.getElementsByTagName("div"); var matches = 0; var i = 0; while (i < resultRows.length) { var row = resultRows.item(i); if (row.className == "SRResult") { var rowMatchName = row.id.toLowerCase(); rowMatchName = rowMatchName.replace(/^sr\d*_/, ''); // strip 'sr123_' if (search.length<=rowMatchName.length && rowMatchName.substr(0, search.length)==search) { row.style.display = 'block'; matches++; } else { row.style.display = 'none'; } } i++; } document.getElementById("Searching").style.display='none'; if (matches == 0) // no results { document.getElementById("NoMatches").style.display='block'; } else // at least one result { document.getElementById("NoMatches").style.display='none'; } this.lastMatchCount = matches; return true; } // return the first item with index index or higher that is visible this.NavNext = function(index) { var focusItem; while (1) { var focusName = 'Item'+index; focusItem = document.getElementById(focusName); if (focusItem && focusItem.parentNode.parentNode.style.display=='block') { break; } else if (!focusItem) // last element { break; } focusItem=null; index++; } return focusItem; } this.NavPrev = function(index) { var focusItem; while (1) { var focusName = 'Item'+index; focusItem = document.getElementById(focusName); if (focusItem && focusItem.parentNode.parentNode.style.display=='block') { break; } else if (!focusItem) // last element { break; } focusItem=null; index--; } return focusItem; } this.ProcessKeys = function(e) { if (e.type == "keydown") { this.repeatOn = false; this.lastKey = e.keyCode; } else if (e.type == "keypress") { if (!this.repeatOn) { if (this.lastKey) this.repeatOn = true; return false; // ignore first keypress after keydown } } else if (e.type == "keyup") { this.lastKey = 0; this.repeatOn = false; } return this.lastKey!=0; } this.Nav = function(evt,itemIndex) { var e = (evt) ? evt : window.event; // for IE if (e.keyCode==13) return true; if (!this.ProcessKeys(e)) return false; if (this.lastKey==38) // Up { var newIndex = itemIndex-1; var focusItem = this.NavPrev(newIndex); if (focusItem) { var child = this.FindChildElement(focusItem.parentNode.parentNode.id); if (child && child.style.display == 'block') // children visible { var n=0; var tmpElem; while (1) // search for last child { tmpElem = document.getElementById('Item'+newIndex+'_c'+n); if (tmpElem) { focusItem = tmpElem; } else // found it! { break; } n++; } } } if (focusItem) { focusItem.focus(); } else // return focus to search field { parent.document.getElementById("MSearchField").focus(); } } else if (this.lastKey==40) // Down { var newIndex = itemIndex+1; var focusItem; var item = document.getElementById('Item'+itemIndex); var elem = this.FindChildElement(item.parentNode.parentNode.id); if (elem && elem.style.display == 'block') // children visible { focusItem = document.getElementById('Item'+itemIndex+'_c0'); } if (!focusItem) focusItem = this.NavNext(newIndex); if (focusItem) focusItem.focus(); } else if (this.lastKey==39) // Right { var item = document.getElementById('Item'+itemIndex); var elem = this.FindChildElement(item.parentNode.parentNode.id); if (elem) elem.style.display = 'block'; } else if (this.lastKey==37) // Left { var item = document.getElementById('Item'+itemIndex); var elem = this.FindChildElement(item.parentNode.parentNode.id); if (elem) elem.style.display = 'none'; } else if (this.lastKey==27) // Escape { parent.searchBox.CloseResultsWindow(); parent.document.getElementById("MSearchField").focus(); } else if (this.lastKey==13) // Enter { return true; } return false; } this.NavChild = function(evt,itemIndex,childIndex) { var e = (evt) ? evt : window.event; // for IE if (e.keyCode==13) return true; if (!this.ProcessKeys(e)) return false; if (this.lastKey==38) // Up { if (childIndex>0) { var newIndex = childIndex-1; document.getElementById('Item'+itemIndex+'_c'+newIndex).focus(); } else // already at first child, jump to parent { document.getElementById('Item'+itemIndex).focus(); } } else if (this.lastKey==40) // Down { var newIndex = childIndex+1; var elem = document.getElementById('Item'+itemIndex+'_c'+newIndex); if (!elem) // last child, jump to parent next parent { elem = this.NavNext(itemIndex+1); } if (elem) { elem.focus(); } } else if (this.lastKey==27) // Escape { parent.searchBox.CloseResultsWindow(); parent.document.getElementById("MSearchField").focus(); } else if (this.lastKey==13) // Enter { return true; } return false; } } function setKeyActions(elem,action) { elem.setAttribute('onkeydown',action); elem.setAttribute('onkeypress',action); elem.setAttribute('onkeyup',action); } function setClassAttr(elem,attr) { elem.setAttribute('class',attr); elem.setAttribute('className',attr); } function createResults() { var results = document.getElementById("SRResults"); for (var e=0; e<searchData.length; e++) { var id = searchData[e][0]; var srResult = document.createElement('div'); srResult.setAttribute('id','SR_'+id); setClassAttr(srResult,'SRResult'); var srEntry = document.createElement('div'); setClassAttr(srEntry,'SREntry'); var srLink = document.createElement('a'); srLink.setAttribute('id','Item'+e); setKeyActions(srLink,'return searchResults.Nav(event,'+e+')'); setClassAttr(srLink,'SRSymbol'); srLink.innerHTML = searchData[e][1][0]; srEntry.appendChild(srLink); if (searchData[e][1].length==2) // single result { srLink.setAttribute('href',searchData[e][1][1][0]); if (searchData[e][1][1][1]) { srLink.setAttribute('target','_parent'); } var srScope = document.createElement('span'); setClassAttr(srScope,'SRScope'); srScope.innerHTML = searchData[e][1][1][2]; srEntry.appendChild(srScope); } else // multiple results { srLink.setAttribute('href','javascript:searchResults.Toggle("SR_'+id+'")'); var srChildren = document.createElement('div'); setClassAttr(srChildren,'SRChildren'); for (var c=0; c<searchData[e][1].length-1; c++) { var srChild = document.createElement('a'); srChild.setAttribute('id','Item'+e+'_c'+c); setKeyActions(srChild,'return searchResults.NavChild(event,'+e+','+c+')'); setClassAttr(srChild,'SRScope'); srChild.setAttribute('href',searchData[e][1][c+1][0]); if (searchData[e][1][c+1][1]) { srChild.setAttribute('target','_parent'); } srChild.innerHTML = searchData[e][1][c+1][2]; srChildren.appendChild(srChild); } srEntry.appendChild(srChildren); } srResult.appendChild(srEntry); results.appendChild(srResult); } } function init_search() { var results = document.getElementById("MSearchSelectWindow"); for (var key in indexSectionLabels) { var link = document.createElement('a'); link.setAttribute('class','SelectItem'); link.setAttribute('onclick','searchBox.OnSelectItem('+key+')'); link.href='javascript:void(0)'; link.innerHTML='<span class="SelectionMark"> </span>'+indexSectionLabels[key]; results.appendChild(link); } searchBox.OnSelectItem(0); }