<form id="form" action="/query!query.action">
<select>
<option value ="" <% if(city==null||"".equal(city)){%> selected="selected"<%}%>>
全部
</option>
<option value ="1" <% if("1".equal(city)){%> selected="selected"<%}%>>
北京
</option>
<option value ="2" <% if("2".equal(city)){%> selected="selected"<%}%>>
上海
</option>
<option value ="3" <% if("3".equal(city)){%> selected="selected"<%}%>>
广州
</option>
</select>
<input type="submit"/>
</form>
但这样感觉很麻烦，特别是当选择项比较多的时候，于是我想用jQuery来实现：
[html] view plaincopy
<script type="text/javascript">
$(document).ready(function(){
$("#city${city}").attr("selected","selected");
})
</script>
<form id="form" action="/query!query.action">
<select name="city">
<option value ="" id="city" selected="selected">全部</option>
<option value ="1" id="city1">北京</option>
<option value ="2" id="city2">上海</option>
<option value ="3" id="city3">广州</option>
</select>
<input type="submit"/>
</form>
一行代码就解决了，很方便
今天又发现了一种方法，更方便：
[html] view plaincopy
<script type="text/javascript">
$(document).ready(function(){
$("#city").val("${city}");
})
</script>
<form id="form" action="/query!query.action">
<select name="city" id="city">
<option value ="" >全部</option>
<option value ="1" >北京</option>
<option value ="2">上海</option>
<option value ="3">广州</option>
</select>
<input type="submit"/>
</form>
