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Posted on 2007-02-01 22:39 Zou Ang 閱讀(3940) 評論(7) 編輯 收藏 所屬分類: 
經過一個星期的煎熬，終于把基于Ajax的輸入提示功能實現了。太痛苦了，寫Javascript的感覺就跟用NotePad來寫代碼一樣，沒有智能提示、弱類型、難調試……總之是太折磨人了。 本來自己寫了一個比較簡單的，但是由于我的頁面上需要多個輸入框，還要可以動態增加輸入框，要把傳回來的結果set入多個輸入框，由于是使用的Struts標簽庫，<html:text>還沒有id屬性，讓這個問題復雜了不少。 需求是這樣的： 有一個頁面，需要錄入貨品信息，貨品有id,編號，名稱，單位，單價，規格等屬性，每個貨品信息在表格中有一行，一行中有多個輸入框，用于輸入貨品信息。在輸入貨品編號的時候，應該訪問后臺的商品信息庫，尋找以前是否有輸入過該編號的貨品，如果有，把編號返回。支持用鼠標點擊，鍵盤回車等方法選擇貨品，選擇后應該把貨品信息顯示到各個輸入框中供用戶修改。如果該貨品在商品信息庫中標記為敏感商品，要作出提示。一個編號可以有多個貨品。 改了3天代碼，終于決定破釜沉舟，刪掉重做。修改了《Ajax in Action》中的代碼，Ajax in Action中的代碼有些地方有錯誤，不仔細檢查一遍還真不太容易發現。書中后臺使用C#,前臺是使用Rico來向某個url傳參數的形式進行Ajax通信。返回的response類似：  <ajax-response>
??<response?type='object'?id='field1_updater'>
????<matches>
??????<text>XXX</text>
??????<value>XXX</value>
????</matches>
??</response>
</ajax-response>不過我不想寫JSP或者Servlet，所以用了DWR，直接用spring中的BO把結果傳回來：   cargobaseService.getByNumberAndCompany(this.lastRequestString,this.company,function(ajaxResponse) {
 //
 });cargobaseService是使用DWR創建的Javascript對象： dwr.xml: <dwr>
??<allow>
????<create?creator="spring"?javascript?=?"cargobaseService">
????????<param?name="beanName"?value="cargobaseService"/>
????</create>
????<convert?match="com.gdnfha.atcs.cargobase.model.*"?converter="bean"></convert>
??</allow>
</dwr>
返回為下面對象的數組 var?cargoModel?=?{
??cargoCompany:?XXX,
??cargoCurrency:?XXX,
??cargoDestination:?XXX,
??cargoId:?XXX,
??cargoImpose:?XXX,
??cargoName:?XXX,
??cargoNumber:?XXX,
??cargoSize:?XXX,
??cargoUnit:?XXX,
??cargoUnitPrice:?XXX,
??sensitive:?true|false
} ?Javascript代碼如下： TextSuggest?=?Class.create();
TextSuggest.prototype?=?{
????//構造函數
  ???initialize:?function(anId,company,?url,?options)?{
??????this.id??????????=?anId;
??????this.company?=?company;
??????var?browser?=?navigator.userAgent.toLowerCase();
??????this.isIE????????=?browser.indexOf("msie")?!=?-1;
??????this.isOpera?????=?browser.indexOf("opera")!=?-1;
??????this.textInput???=?$(this.id);
??????this.suggestions?=?new?Array();
??????this.setOptions(options);
??????this.injectSuggestBehavior();
 ???},
????//設置參數
???setOptions:?function(options)?{
??????this.options?=?{
?????????suggestDivClassName:?'suggestDiv',
?????????suggestionClassName:?'suggestion',
?????????matchClassName?????:?'match',
?????????matchTextWidth?????:?true,
?????????selectionColor?????:?'#b1c09c',
?????????matchAnywhere??????:?false,
?????????ignoreCase?????????:?false,
?????????count??????????????:?10
??????}.extend(options?||?{});
???},
????//注入輸入提示行為
???injectSuggestBehavior:?function()?{
??????if?(?this.isIE?)
?????????this.textInput.autocomplete?=?"off";
????//創建控制器
??????var?keyEventHandler?=?new?TextSuggestKeyHandler(this);
??????//主要是為了避免在按回車的時候把表單提交
??????new?Insertion.After(?this.textInput,
???????????????????????????'<input?type="text"?id="'+this.id+'_preventtsubmit'+'"?style="display:none"/>'?);
??????new?Insertion.After(?this.textInput,
???????????????????????????'<input?type="hidden"?name="'+this.id+'_hidden'+'"?id="'+this.id+'_hidden'+'"/>'?);
????//創建div層
??????this.createSuggestionsDiv();
???},
????//處理輸入信息
???handleTextInput:?function()?{
?????var?previousRequest????=?this.lastRequestString;
?????this.lastRequestString?=?this.textInput.value;
?????if?(?this.lastRequestString?==?""?)
????????this.hideSuggestions();
?????else?if?(?this.lastRequestString?!=?previousRequest?)?{
?????????//訪問數據源
????????this.sendRequestForSuggestions();
?????}
???},
????//選擇框上移
???moveSelectionUp:?function()?{
??????if?(?this.selectedIndex?>?0?)?{
?????????this.updateSelection(this.selectedIndex?-?1);
??????}
???},
????//選擇框下移
???moveSelectionDown:?function()?{
??????if?(?this.selectedIndex?<?(this.suggestions.length?-?1)??)?{
?????????this.updateSelection(this.selectedIndex?+?1);
??????}
???},
????//更新當前選擇信息
???updateSelection:?function(n)?{
??????var?span?=?$(?this.id?+?"_"?+?this.selectedIndex?);
??????if?(?span?){
??????????//消除以前的樣式
?????????span.style.backgroundColor?=?"";
??????}
??????this.selectedIndex?=?n;
??????var?span?=?$(?this.id?+?"_"?+?this.selectedIndex?);
??????if?(?span?){
??????????//更新新樣式
?????????span.style.backgroundColor?=?this.options.selectionColor;
??????}
???},
????//發送請求
???sendRequestForSuggestions:?function()?{
?????if?(?this.handlingRequest?)?{
????????this.pendingRequest?=?true;
????????return;
?????}
?????this.handlingRequest?=?true;
?????this.callDWRAjaxEngine();
???},
????//使用DWR訪問后臺
???callDWRAjaxEngine:?function()?{
???????????//保存當前對象指針
???????????var?tempThis?=?this;
???????????cargobaseService.getByNumberAndCompany(this.lastRequestString,this.company,function(ajaxResponse){
????????????tempThis.suggestions?=?ajaxResponse;
??????????????if?(?tempThis.suggestions.length?==?0?)?{
?????????????????tempThis.hideSuggestions();
?????????????????$(?tempThis.id?+?"_hidden"?).value?=?"";
??????????????}else?{
?????????????????tempThis.updateSuggestionsDiv();
?????????????????tempThis.showSuggestions();
?????????????????tempThis.updateSelection(0);
??????????????}
??????????????tempThis.handlingRequest?=?false;
????????????if?(?tempThis.pendingRequest?)?{
????????????????tempThis.pendingRequest????=?false;
?????????????????tempThis.lastRequestString?=?this.textInput.value;
?????????????????tempThis.sendRequestForSuggestions();
??????????????}
???????????});
???},
???//顯示信息
???setInputFromSelection:?function()?{
???????var?index?=?this.id.split("_");
???????var?trId?=?"cargoTr_"?+?index[1];
???????var?trElement?=?$(trId);
???????var?cellNodes?=?trElement.childNodes;
?????var?suggestion??=?this.suggestions[?this.selectedIndex?];
????for(var?i?=?0;?i?<?cellNodes.length;?i++){
????????var?cargo?=?cellNodes[i].firstChild;
????????if(cargo.name?==?"cargoName"){
????????????cargo.value?=?suggestion.cargoName;
????????}
????????if(cargo.name?==?"cargoSize"){
????????????cargo.value?=?suggestion.cargoSize;
????????}
????????if(cargo.name?==?"cargoUnit"){
????????????cargo.value?==?suggestion.cargoUnit;
????????}
????????if(cargo.name?==?"cargoDestination"){
????????????cargo.value?=?suggestion.cargoDestination;
????????}
????????if(cargo.name?==?"cargoUnitPrice"){
????????????cargo.value?=?suggestion.cargoUnitPrice;
????????}
????}
?????this.textInput.value?=?suggestion.cargoNumber;
?????//敏感提示
?????if(suggestion.sensitive){
?????????var?warnStr?=?"注意!\n編號:"+suggestion.cargoNumber
?????????????????????????????????+"\n名稱:"?+?suggestion.cargoName
?????????????????????????????????+"\n為敏感商品!";
?????????alert(warnStr);?
?????}
?????this.hideSuggestions();
???},
????//顯示層
???showSuggestions:?function()?{
??????var?divStyle?=?this.suggestionsDiv.style;
??????if?(?divStyle.display?==?''?)
?????????return;
??????this.positionSuggestionsDiv();
??????divStyle.display?=?'';
???},
????//定位層
???positionSuggestionsDiv:?function()?{
??????var?textPos?=?RicoUtil.toDocumentPosition(this.textInput);
??????var?divStyle?=?this.suggestionsDiv.style;
??????divStyle.top??=?(textPos.y?+?this.textInput.offsetHeight)?+?"px";
??????divStyle.left?=?textPos.x?+?"px";
??????if?(?this.options.matchTextWidth?)
?????????divStyle.width?=?(this.textInput.offsetWidth-?this.padding())?+?"px";
???},
????//計算間隔
???padding:?function()?{
?????try{
??????var?styleFunc?=?RicoUtil.getElementsComputedStyle;
??????var?lPad????=?styleFunc(?this.suggestionsDiv,?"paddingLeft",??????"padding-left"?);
??????var?rPad????=?styleFunc(?this.suggestionsDiv,?"paddingRight",?????"padding-right"?);
??????var?lBorder?=?styleFunc(?this.suggestionsDiv,?"borderLeftWidth",??"border-left-width"?);
??????var?rBorder?=?styleFunc(?this.suggestionsDiv,?"borderRightWidth",?"border-right-width"?);
??????lPad????=?isNaN(lPad)??????0?:?lPad;
??????rPad????=?isNaN(rPad)??????0?:?rPad;
??????lBorder?=?isNaN(lBorder)???0?:?lBorder;
??????rBorder?=?isNaN(rBorder)???0?:?rBorder;
??????return?parseInt(lPad)?+?parseInt(rPad)?+?parseInt(lBorder)?+?parseInt(rBorder);
?????}catch?(e){
??????return?0;
?????}
???},
????//隱藏層
???hideSuggestions:?function()?{
??????this.suggestionsDiv.style.display?=?'none';
???},
????//創建層
???createSuggestionsDiv:?function()?{
??????this.suggestionsDiv?=?document.createElement("div");
??????this.suggestionsDiv.className?=?this.options.suggestDivClassName;
??????var?divStyle?=?this.suggestionsDiv.style;
??????divStyle.position?=?'absolute';
??????divStyle.zIndex???=?101;
??????divStyle.display??=?"none";
??????this.textInput.parentNode.appendChild(this.suggestionsDiv);
???},
????//更新層
???updateSuggestionsDiv:?function()?{
??????this.suggestionsDiv.innerHTML?=?"";
??????var?suggestLines?=?this.createSuggestionSpans();
??????for?(?var?i?=?0?;?i?<?suggestLines.length?;?i++?)
?????????this.suggestionsDiv.appendChild(suggestLines[i]);
???},
????//創建層中的選項span
???createSuggestionSpans:?function()?{
??????var?regExpFlags?=?"";
??????if?(?this.options.ignoreCase?)
?????????regExpFlags?=?'i';
??????var?startRegExp?=?"^";
??????if?(?this.options.matchAnywhere?)
?????????startRegExp?=?'';
?????????//正則表達式匹配
??????var?regExp??=?new?RegExp(?startRegExp?+?this.lastRequestString,?regExpFlags?);
??????var?suggestionSpans?=?new?Array();
??????for?(?var?i?=?0?;?i?<?this.suggestions.length?;?i++?)
?????????suggestionSpans.push(?this.createSuggestionSpan(?i,?regExp?)?)
??????return?suggestionSpans;
???},
????//創建單個選項span
???createSuggestionSpan:?function(?n,?regExp?)?{
??????var?suggestion?=?this.suggestions[n];
??????var?suggestionSpan?=?document.createElement("span");
??????suggestionSpan.className?=?this.options.suggestionClassName;
??????suggestionSpan.style.width???=?'100%';
??????suggestionSpan.style.display?=?'block';
??????suggestionSpan.id????????????=?this.id?+?"_"?+?n;
??????suggestionSpan.onmouseover???=?this.mouseoverHandler.bindAsEventListener(this);
??????suggestionSpan.onclick???????=?this.itemClickHandler.bindAsEventListener(this);
??????var?textValues?=?this.splitTextValues(?suggestion.cargoNumber+"",
?????????????????????????????????????????????this.lastRequestString.length,
?????????????????????????????????????????????regExp?);
??????var?textMatchSpan?=?document.createElement("span");
??????textMatchSpan.id????????????=?this.id?+?"_match_"?+?n;
??????textMatchSpan.className?????=?this.options.matchClassName;
??????textMatchSpan.onmouseover???=?this.mouseoverHandler.bindAsEventListener(this);
??????textMatchSpan.onclick???????=?this.itemClickHandler.bindAsEventListener(this);
??????textMatchSpan.appendChild(?document.createTextNode(textValues.mid)?);
??????suggestionSpan.appendChild(?document.createTextNode(?textValues.start?)?);
??????suggestionSpan.appendChild(?textMatchSpan?);
??????suggestionSpan.appendChild(?document.createTextNode(?textValues.end?)?);
??????return?suggestionSpan;
???},
????//鼠標經過處理
???mouseoverHandler:?function(e)?{
??????var?src?=?e.srcElement???e.srcElement?:?e.target;
??????var?index?=?parseInt(src.id.substring(src.id.lastIndexOf('_')+1));
??????this.updateSelection(index);
???},
????//鼠標點擊處理
???itemClickHandler:?function(e)?{
??????this.mouseoverHandler(e);
??????//原書沒有下面一句，也就是說鼠標點擊不會把數據set入輸入框！
??????this.setInputFromSelection();
??????this.hideSuggestions();
???},
????//分拆字符串
???splitTextValues:?function(?text,?len,?regExp?)?{
??????var?startPos??=?text.search(regExp);
??????var?matchText?=?text.substring(?startPos,?startPos?+?len?);
??????var?startText?=?startPos?==?0???""?:?text.substring(0,?startPos);
??????var?endText???=?text.substring(?startPos?+?len?);
??????return?{?start:?startText,?mid:?matchText,?end:?endText?};
???},
???getElementContent:?function(element)?{
??????return?element.firstChild.data;
???}
}
//控制器類
TextSuggestKeyHandler?=?Class.create();
TextSuggestKeyHandler.prototype?=?{
????//構造方法
???initialize:?function(?textSuggest?)?{
???????????//TextSuggest類的引用
??????this.textSuggest?=?textSuggest;
??????//輸入框的引用
??????this.input???????=?this.textSuggest.textInput;
??????//為輸入框增加事件響應機制
??????this.addKeyHandling();
???},
???addKeyHandling:?function()?{
??????this.input.onkeyup????=?this.keyupHandler.bindAsEventListener(this);
??????this.input.onkeydown??=?this.keydownHandler.bindAsEventListener(this);
??????this.input.onblur?????=?this.onblurHandler.bindAsEventListener(this);
??????//原書有錯，原文是this.isOpera,但是TextSuggestKeyHandler沒有isOpera屬性
??????if?(?this.textSuggest.isOpera?)
?????????this.input.onkeypress?=?this.keyupHandler.bindAsEventListener(this);
???},
????//按鍵按下事件響應
???keydownHandler:?function(e)?{
??????var?upArrow???=?38;
??????var?downArrow?=?40;
??????if?(?e.keyCode?==?upArrow?)?{
?????????this.textSuggest.moveSelectionUp();
?????????setTimeout(?this.moveCaretToEnd.bind(this),?1?);
??????}
??????else?if?(?e.keyCode?==?downArrow?){
?????????this.textSuggest.moveSelectionDown();
??????}
???},
????//放開按鍵事件響應
???keyupHandler:?function(e)?{
??????if?(?this.input.length?==?0?&&?!this.isOpera?)
?????????this.textSuggest.hideSuggestions();
?????if?(?!this.handledSpecialKeys(e)?)
????????this.textSuggest.handleTextInput();
???},
????//處理特殊按鍵
???handledSpecialKeys:?function(e)?{
??????var?enterKey??=?13;
??????var?upArrow???=?38;
??????var?downArrow?=?40;
??????if?(?e.keyCode?==?upArrow?||?e.keyCode?==?downArrow?)?{
?????????return?true;
??????}
??????else?if?(?e.keyCode?==?enterKey?)?{
??????????//回車則set入數據
?????????this.textSuggest.setInputFromSelection();
?????????return?true;
??????}
??????return?false;
???},
????//不太明白這個方法干啥用的
???moveCaretToEnd:?function()?{
??????var?pos?=?this.input.value.length;
??????if?(this.input.setSelectionRange)?{
?????????this.input.setSelectionRange(pos,pos);
??????}
??????else?if(this.input.createTextRange){
?????????var?m?=?this.input.createTextRange();
?????????m.moveStart('character',pos);
?????????m.collapse();
?????????m.select();
??????}
???},
????//失去焦點事件響應
???onblurHandler:?function(e)?{
??????if?(?this.textSuggest.suggestionsDiv.style.display?==?''?)
??????//如果當前輸入是顯示的，那么點擊其他地方應該把選擇值注入輸入框
?????????this.textSuggest.setInputFromSelection();
??????this.textSuggest.hideSuggestions();
???}
};
有幾個地方是需要特別注意的： 用下面得方法訪問后臺，并把結果放到當前對象得suggestions數組中： ????//使用DWR訪問后臺
???callDWRAjaxEngine:?function()?{
???????????//保存當前對象指針
???????????var?tempThis?=?this;
???????????cargobaseService.getByNumberAndCompany(this.lastRequestString,this.company,function(ajaxResponse){
????????????tempThis.suggestions?=?ajaxResponse;
??????????????if?(?tempThis.suggestions.length?==?0?)?{
?????????????????tempThis.hideSuggestions();
?????????????????$(?tempThis.id?+?"_hidden"?).value?=?"";
??????????????}else?{
?????????????????tempThis.updateSuggestionsDiv();
?????????????????tempThis.showSuggestions();
?????????????????tempThis.updateSelection(0);
??????????????}
??????????????tempThis.handlingRequest?=?false;
????????????if?(?tempThis.pendingRequest?)?{
????????????????tempThis.pendingRequest????=?false;
?????????????????tempThis.lastRequestString?=?this.textInput.value;
?????????????????tempThis.sendRequestForSuggestions();
??????????????}
???????????});
???}, 這個方法中一定要用tempThis保存當前對象的引用，原文中直接用this的話會產生object Error ???//顯示信息
???setInputFromSelection:?function()?{
???????var?index?=?this.id.split("_");
???????var?trId?=?"cargoTr_"?+?index[1];
???????var?trElement?=?$(trId);
???????var?cellNodes?=?trElement.childNodes;
?????var?suggestion??=?this.suggestions[?this.selectedIndex?];
????for(var?i?=?0;?i?<?cellNodes.length;?i++){
????????var?cargo?=?cellNodes[i].firstChild;
????????if(cargo.name?==?"cargoName"){
????????????cargo.value?=?suggestion.cargoName;
????????}
????????if(cargo.name?==?"cargoSize"){
????????????cargo.value?=?suggestion.cargoSize;
????????}
????????if(cargo.name?==?"cargoUnit"){
????????????cargo.value?==?suggestion.cargoUnit;
????????}
????????if(cargo.name?==?"cargoDestination"){
????????????cargo.value?=?suggestion.cargoDestination;
????????}
????????if(cargo.name?==?"cargoUnitPrice"){
????????????cargo.value?=?suggestion.cargoUnitPrice;
????????}
????}
?????this.textInput.value?=?suggestion.cargoNumber;
?????//敏感提示
?????if(suggestion.sensitive){
?????????var?warnStr?=?"注意!\n編號:"+suggestion.cargoNumber
?????????????????????????????????+"\n名稱:"?+?suggestion.cargoName
?????????????????????????????????+"\n為敏感商品!";
?????????alert(warnStr);?
?????}
?????this.hideSuggestions();
???}, 使用這個方法把結果set到輸入框中 其他幾個地方比較麻煩的就是原書的代碼有錯了，我是自己手打進去的才發現
頁面上使用下面方法為輸入框增加ajax的自動提示功能：
function?prepareTypeAhead(){
????var?companyArray?=?document.getElementsByName("bill.clientName");
????var?company?=?companyArray[0].value;
????var?cargoArray?=?document.getElementsByName("cargoNumber");
????var?suggestOptions?=?{};
????for(var?i?=?0;?i?<?cargoArray.length;?i++){
????????cargoArray[i].id?=?"cargo_"?+?i;
????????suggest?=?createTextSuggest("cargo_"+i,company,suggestOptions);
????}
}
function?createTextSuggest(id,company,suggestOptions){
????//為輸入框增加輸入提示功能
????suggest?=?new?TextSuggest(id,company,suggestOptions);
????return?suggest;
} 可以自己配置選項： ???setOptions:?function(options)?{
??????this.options?=?{
??????????//層樣式
?????????suggestDivClassName:?'suggestDiv',
?????????//選項樣式
?????????suggestionClassName:?'suggestion',
?????????//匹配樣式
?????????matchClassName?????:?'match',
?????????//是否匹配輸入框寬度
?????????matchTextWidth?????:?true,
?????????//選項顏色
?????????selectionColor?????:?'#b1c09c',
?????????//是否從頭匹配
?????????matchAnywhere??????:?false,
?????????//是否忽略大小寫
?????????ignoreCase?????????:?false,
?????????//顯示數目，暫時沒用上
?????????count??????????????:?10
??????}.extend(options?||?{});
???}, 至此就差不多了，其實全都是Ajax in Action上的代碼，可是他的代碼寫得太繁復，很難看明白，而且書上的解釋也不太清楚（我這么覺得），可能是由于我不熟悉javascript得緣故吧，還是有很大得差距，要努力！基本按照上面的代碼，把獲取輸入的方式和設置結果的方式重寫一下就可以重用了，還很容易配置，真是很精致的類啊
評論
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置 回復 更多評論
2007-02-01 22:45 by
本來也不是什么很難的東西，可是寫著寫著就頭大，刪了又寫，寫了又刪，太煩人了
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置 回復 更多評論
2007-02-02 08:37 by
<html:text>還沒有id屬性???styleId是啥
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置[未登錄] 回復 更多評論
2007-02-02 08:45 by
@啊啊啊啊
多謝指導！一直不知道呵呵……謝謝啊
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置[未登錄] 回復 更多評論
2007-02-02 13:46 by
不明白這種功夫有多大的意義，用dwr一切都可以解決，做事要動腦子阿。
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置 回復 更多評論
2007-02-05 11:46 by
呵呵,樓上的,DWR確實是牛
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置 回復 更多評論
2007-02-06 23:35 by
老弟，你寫這個東西就叫煩人啊，我每個星期都要寫幾千行的JS代碼，那我不早就跳樓算了。還有像“啊啊啊啊 ”說的一樣，struts中把styleId屬性做為html標簽的id屬性使用，這個在reference中就可以查到的了。
# re: Javascript噩夢－Ajax實現輸入提示的調整與配置 回復 更多評論
2007-02-07 07:58 by
@errorfun
呵呵，不常寫嘛，別見怪～
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