DataTables warning : Requested unknown parameter '3' from

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今天遇到一个Datatables常见的问题，搞了好久没弄好，查看baidu也没有成果，在google上查到了原因。

 

问题：

DataTables warning: Requested unknown parameter '3' from the data source for row 0

 

JS:

function initializeEvents() {
	$('.datatable').dataTable({
		"sDom": "<'row-fluid'<'span6'l><'span6'f>r>t<'row-fluid'<'span12'i><'span12 center'p>>",
		"bServerSide" : true,
		"sAjaxSource" : "/uploadDemo/admin/photo/list.spring",
	    "sServerMethod" : "POST" ,
	    "bProcessing" : false,
	    "bPaginate": true,
		"bLengthChange" : true,
		"iDisplayLength" : 10,
		"fnAdjustColumnSizing" : false,
		"bStateSave": false,
		"bSort":false,
		"bFilter":false,
		"aoColumnDefs" : makeCollumnDef(),
		"aoColumns" : makeCollomns(),
		"sPaginationType": "bootstrap",
		"oLanguage": {
		"sLengthMenu": "_MENU_ records per page"
		}
	} );
}
function makeCollumnDef() {
	return [
	        { "fnRender" : function (oObj, sVal) {
	      	        return oObj.aData.id;
	           },
	           "bVisible" : true ,
	           "aTargets" : [ 0 ]
	        },
	        { "fnRender" : function (oObj, sVal) {
	      	        return oObj.aData.name;
	           },
	           "bVisible" : true ,
	           "aTargets" : [ 1 ]
	        },
	        { "fnRender" : function (oObj, sVal) {
	      	        return "";
	           },
	           "bVisible" : true ,
	           "aTargets" : [ 2 ]
	        },
	        { "fnRender" : function (oObj, sVal) {
	      	        return createAction(oObj.aData.id);
	           },
	           "bVisible" : true ,
	           "aTargets" : [ 3 ]
	        }]; 
}
function makeCollomns(){
	return [{ "mDataProp" : "id", "sHeight":"15px"}, 
        	{ "mDataProp" : "name"},
        	{ "mDataProp" : "path"}}];
}
function createAction(id) {
	var inhtml = '';
	inhtml += 'View ';
	inhtml += '';
	inhtml += 'Edit ';
	inhtml += '';
	inhtml += 'Delete';
	return inhtml;
}

 

 

参考了 https://gist.github.com/kagemusha/1660712 这个大神的解决方案：

意思就是 aoColumns 和 aoColumnDefs的个数必须相等，否则会出错，由于我在表格中加入了一个Action列，导致aoColumns 和 aoColumnDefs的数目不等，就出了上面的错，该法就比较简单：

在 Java Bean 中添加一个任意字段，把他添加到aoColumnDefs 就好了。

 

public class PhotoBean {

    private int id;
    private String name;
    private String path;
    private String checked;

 

function makeCollomns(){
	return [{ "mDataProp" : "id", "sHeight":"15px"}, 
        	{ "mDataProp" : "name"},
        	{ "mDataProp" : "path"},
        	{ "mDataProp" : "checked"}];

 

我添加了一个checked的字符串，问题解决。