📄 dwr 入門與應用（二） - 林信良（良葛格）的专栏 - csdnblog.htm
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<SPAN class=javascript id=text166425>假設您要從資料庫中查詢出一些字串，然後填寫到表單的下拉選單中。
<BR><BR>例如一個示意的Java程式如下： <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><FONT class=java-reserved_word><STRONG>package</STRONG></FONT> onlyfun.caterpillar;<BR> <BR><FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>class</STRONG></FONT> Option <FONT class=java-bracket>{</FONT><BR> <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> String[] getOptions() <FONT class=java-bracket>{</FONT><BR> <FONT class=java-comment>// 實際上這些字串是從資料庫中查到的啦…</FONT><BR> <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"良葛格"</FONT>, <FONT class=java-string>"毛美眉"</FONT>, <FONT class=java-string>"米小狗"</FONT><FONT class=java-bracket>}</FONT>; <BR> <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>傳回的字串陣列，您要填寫到下拉選單中，當然，首先我們要在dwr.xml中開發這個物件…
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><?xml version=<FONT class=java-string>"1.0"</FONT> encoding=<FONT class=java-string>"UTF-8"</FONT>?><BR><!DOCTYPE dwr PUBLIC <FONT class=java-string>"-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"</FONT> <FONT class=java-string>"http://www.getahead.ltd.uk/dwr/dwr10.dtd"</FONT>><BR> <BR><dwr><BR> <allow><BR> <create creator=<FONT class=java-string>"new"</FONT> javascript=<FONT class=java-string>"OPT"</FONT>><BR> <param name=<FONT class=java-string>"class"</FONT> value=<FONT class=java-string>"onlyfun.caterpillar.Option"</FONT>/><BR> </create> <BR> </allow><BR></dwr><BR></PRE></TD></TR></TBODY></TABLE><BR><BR>這是我們的網頁…
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><!DOCTYPE HTML PUBLIC <FONT class=java-string>"-//W3C//DTD HTML 4.01 Transitional//EN"</FONT>><BR><html><BR><head><BR><meta http-equiv=<FONT class=java-string>"Content-Type"</FONT> content=<FONT class=java-string>"text/html; charset=BIG5"</FONT>><BR><script src=<FONT class=java-string>"option.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>></script><BR><script src=<FONT class=java-string>"dwr/interface/OPT.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>></script><BR><script src=<FONT class=java-string>"dwr/engine.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>></script><BR><script src=<FONT class=java-string>"dwr/util.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>></script><BR> <BR></head><BR> <BR><body><BR> 選項: <select id=<FONT class=java-string>"opts"</FONT>></select><BR></body><BR></html><BR></PRE></TD></TR></TBODY></TABLE><BR><BR>傳回的字串陣列會填入opts這個select中，我們的option.js如下… <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE>window.onload = function() <FONT class=java-bracket>{</FONT><BR> OPT.getOptions(populate); <BR><FONT class=java-bracket>}</FONT>;<BR> <BR>function populate(list)<FONT class=java-bracket>{</FONT><BR> DWRUtil.removeAllOptions(<FONT class=java-string>"opts"</FONT>);<BR> DWRUtil.addOptions(<FONT class=java-string>"opts"</FONT>, list);<BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>夠簡單了…不需要解釋了…
<BR><BR>看一下結果… </SPAN><BR><IMG alt=""
src="DWR 入門與應用（二） - 林信良（良葛格）的专栏 - CSDNBlog.files/88753484.jpg"><BR><BR><SPAN
class=javascript id=text166427>好啦！我知道有人在說了，這個程式有夠無聊…<IMG alt=Dead
src="DWR 入門與應用（二） - 林信良（良葛格）的专栏 - CSDNBlog.files/smile_dead.gif" width=15>
<BR><BR>改一下！就是個不錯的範例了，例如連動方塊，唔！在Ajax in action中叫啥？Dynamic double combo？…
<BR><BR>假設一個會去從資料庫中查詢資料的Java程式示意如下： <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR>24<BR>25<BR>26<BR>27<BR>28<BR>29<BR>30<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><FONT class=java-reserved_word><STRONG>package</STRONG></FONT> onlyfun.caterpillar;<BR> <BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.Map;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.TreeMap;<BR> <BR><FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>class</STRONG></FONT> Bike <FONT class=java-bracket>{</FONT><BR> <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> Map<String, String[]> bikes;<BR> <BR> <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> Bike() <FONT class=java-bracket>{</FONT><BR> bikes = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> TreeMap<String, String[]>();<BR> bikes.put(<FONT class=java-string>"2000"</FONT>, <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"2000 T1"</FONT>, <FONT class=java-string>"2000 T2"</FONT>, <FONT class=java-string>"2000 T3"</FONT><FONT class=java-bracket>}</FONT>);<BR> bikes.put(<FONT class=java-string>"2001"</FONT>, <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"2001 A1"</FONT>, <FONT class=java-string>"2001 A2"</FONT><FONT class=java-bracket>}</FONT>);<BR> bikes.put(<FONT class=java-string>"2002"</FONT>, <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"2002 BW1"</FONT>, <FONT class=java-string>"2002 BW2"</FONT>, <FONT class=java-string>"2002 BW"</FONT><FONT class=java-bracket>}</FONT>);<BR> bikes.put(<FONT class=java-string>"2003"</FONT>, <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"2003 S320"</FONT><FONT class=java-bracket>}</FONT>);<BR> bikes.put(<FONT class=java-string>"2004"</FONT>, <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[] <FONT class=java-bracket>{</FONT><FONT class=java-string>"2004 TA1"</FONT>, <FONT class=java-string>"2004 TA2"</FONT>, <FONT class=java-string>"2004 TA3"</FONT><FONT class=java-bracket>}</FONT>);<BR> <FONT class=java-bracket>}</FONT><BR> <BR> <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> String[] getYears() <FONT class=java-bracket>{</FONT><BR> String[] keys = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> String[bikes.size()];<BR> <FONT class=java-reserved_word><STRONG>int</STRONG></FONT> i = 0;<BR> <FONT class=java-reserved_word><STRONG>for</STRONG></FONT>(String key : bikes.keySet()) <FONT class=java-bracket>{</FONT><BR> keys[i++] = key;<BR> <FONT class=java-bracket>}</FONT><BR> <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> keys; <BR> <FONT class=java-bracket>}</FONT><BR> <BR> <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> String[] getBikes(String year) <FONT class=java-bracket>{</FONT><BR> <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> bikes.get(year);<BR> <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>getYears()跟getBkies()分別表示產品的年份跟型號，這邊用Map模擬，實際上資料是來自資料庫的查詢。
<BR><BR>一樣的，在dwr.xml中設定： <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><?xml version=<FONT class=java-string>"1.0"</FONT> encoding=<FONT class=java-string>"UTF-8"</FONT>?><BR><!DOCTYPE dwr PUBLIC <FONT class=java-string>"-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"</FONT> <FONT class=java-string>"http://www.getahead.ltd.uk/dwr/dwr10.dtd"</FONT>><BR> <BR><dwr><BR> <allow><BR> <create creator=<FONT class=java-string>"new"</FONT> javascript=<FONT class=java-string>"Bike"</FONT> scope=<FONT class=java-string>"application"</FONT>><BR> <param name=<FONT class=java-string>"class"</FONT> value=<FONT class=java-string>"onlyfun.caterpillar.Bike"</FONT>/><BR> </create><BR> </allow><BR></dwr><BR></PRE></TD></TR></TBODY></TABLE><BR><BR>我們會有個腳踏車年份與型號查詢頁面：
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE><!DOCTYPE HTML PUBLIC <FONT class=java-string>"-//W3C//DTD HTML 4.01 Transitional//EN"</FONT>><BR><html><BR><head><BR><meta http-equiv=<FONT class=java-string>"Content-Type"</FONT> content=<FONT class=java-string>"text/html; charset=BIG5"</FONT>><BR><title>Insert title here</title><BR> <script type=<FONT class=java-string>'text/javascript'</FONT> src=<FONT class=java-string>'dwr/interface/Bike.js'</FONT>></script><BR> <script type=<FONT class=java-string>'text/javascript'</FONT> src=<FONT class=java-string>'dwr/engine.js'</FONT>></script><BR> <script type=<FONT class=java-string>'text/javascript'</FONT> src=<FONT class=java-string>'dwr/util.js'</FONT>></script><BR> <script type=<FONT class=java-string>'text/javascript'</FONT> src=<FONT class=java-string>'bike.js'</FONT>></script><BR></head><BR><body onload=<FONT class=java-string>"refreshYearList();"</FONT>><BR> 年份：<select id=<FONT class=java-string>"years"</FONT> onchange=<FONT class=java-string>"refreshBikeList();"</FONT>></select><br/><br/><BR> 型號：<select id=<FONT class=java-string>"bikes"</FONT>></select><br/><BR></body><BR></html><BR></PRE></TD></TR></TBODY></TABLE><BR><BR>注意，在選完第一個年份後，會觸發onchange事件，接著第二個下拉選單會自動填上對應年份的型號，而不是按鈕按下，再去取得第二個下拉選單，然後refresh...blah...blah...
<BR><BR>bike.js如下… <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
<TBODY>
<TR>
<TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR></FONT></PRE></TD>
<TD vAlign=top align=left bgColor=#ffffff><PRE>function refreshYearList() <FONT class=java-bracket>{</FONT><BR> Bike.getYears(populateYearList);<BR><FONT class=java-bracket>}</FONT><BR> <BR>function populateYearList(list)<FONT class=java-bracket>{</FONT><BR> DWRUtil.removeAllOptions(<FONT class=java-string>"years"</FONT>);<BR> DWRUtil.addOptions(<FONT class=java-string>"years"</FONT>, list);<BR> refreshBikeList();<BR><FONT class=java-bracket>}</FONT><BR> <BR>function refreshBikeList() <FONT class=java-bracket>{</FONT><BR> var year = $(<FONT class=java-string>"years"</FONT>).value;<BR> Bike.getBikes(year, populateBikeList);<BR><FONT class=java-bracket>}</FONT><BR> <BR>function populateBikeList(list)<FONT class=java-bracket>{</FONT><BR> DWRUtil.removeAllOptions(<FONT class=java-string>"bikes"</FONT>);<BR> DWRUtil.addOptions(<FONT class=java-string>"bikes"</FONT>, list);<BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>一樣很簡單…
<BR><BR>看個無聊的畫面…XD </SPAN><BR><BR><IMG alt=""
src="DWR 入門與應用（二） - 林信良（良葛格）的专栏 - CSDNBlog.files/42270937.jpg">
<P class="right articalinfo">发表于 @ <A title=permalink
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