import project导入后出现HttpServlet错误、JavaProject转成WebProject、jqGrid之subGrid

1、import project导入后出现HttpServlet错误：

　　原因是因为eclipse中没有继承servlet-api.jar，解决方案，右击BuildPath->ConfigBuildPath->addLibrary->Server Runtime->选择tomcat，因为tomcat容器中有集成，myEclipse中也有集成。

2、JavaProject转成WebProject

　　右击project->Properties->Project Facets->选择Dynamic Web Projects,还要勾选java、JavaScript选项，之后选择Deployment Assembly选项，将WebContent改成WebRoot

3、jqGrid之subGrid

　　要在jqGrid添加subGrid，方法：设置subGrid属性为true，并添加subGridRowExpanded，代码如下：

subGridRowExpanded: function(subgrid_id, row_id) { // we pass two parameters // subgrid_id is a id of the div tag created whitin a table data // the id of this elemenet is a combination of the "sg_" + id of the row // the row_id is the id of the row // If we wan to pass additinal parameters to the url we can use // a method getRowData(row_id) - which returns associative array in type name-value // here we can easy construct the flowing var subgrid_table_id, pager_id; subgrid_table_id = subgrid_id+"_t"; pager_id = "p_"+subgrid_table_id; $("#"+subgrid_id).html("<table id='"+subgrid_table_id+"' class='scroll'></table><div id='"+pager_id+"' class='scroll'></div>"); jQuery("#"+subgrid_table_id).jqGrid({ url:"subgrid.php?q=2&id="+row_id, datatype: "xml", colNames: ['No','Item','Qty','Unit','Line Total'], colModel: [ {name:"num",index:"num",80,key:true}, {name:"item",index:"item",130}, {name:"qty",index:"qty",70,align:"right"}, {name:"unit",index:"unit",70,align:"right"}, {name:"total",index:"total",70,align:"right",sortable:false} ], rowNum:20, pager: pager_id, sortname: 'num', sortorder: "asc", height: '100%' }); jQuery("#"+subgrid_table_id).jqGrid('navGrid',"#"+pager_id,{edit:false,add:false,del:false}) },