Hello Hello everyone: I still love Shenyangjava trainingThe Tsai, brought to you today is from the front desk ajax Detailed analysis and backstage pass to an array of problems.

Welcome to the Markdown editor

//batch deletion
$(‘body’).on(“click”, “#deleteBatch”, function () {
var cbs = KaTeX parse error: Expected '}', got 'EOF' at end of input: …h; i++){ if((cbs[i]).prop(“checked”)){
var q = $(cbs[i]).parent().parent().children(); q = Number($(cbs[i]).parent().parent().children();q=Number((q[q.length-1]).html());
cbsArr.push(q);
}
}
cbsArr = toString(cbsArr);
console.log(cbsArr);

	$.ajax({
		url:'NewsDeleteBatchServlet',
		type:'post',
		async:true,
		// traditional attributes of ajax
		//traditional:true,
		data:{
			cbsArr:cbsArr
		},
		success:function(){
			//window.location.replace('NewsTablePage.jsp');
		}
	})
})

By checking the box, acquisition parameters, batch operation.
jq obtained is set or array, is transmitted to the background by ajax, background using req.getParameter () to receive this parameter can not be obtained and found to give the null.
after a search on the network, a solution was found
a Program: ajax To attribute String of data format, we can put the code prior to cbsArr type String, and then further transfer parameters can be modeled in JAVA Arrays.. toString () to write a that is:

function toString(arr){
var b = ‘’;
for(var i = 0 ; i < arr.length ;i++){
if(arr[i] != null){
b = b +"’"+ arr[i] +"’";
if( i == arr.length-1){
return b;
}
b = b + ‘,’;
}
}
}
Thus, the background data can be obtained a
Scheme II: We can add to a traditional ajax: true attribute.
traditional:true
query that this property, this property defaults to false, jquery depth will serialize this object, PHP, etc. to accommodate the frame, we can stop the sequence of depth by setting to true tradtional
After setting the traditional attributes, data types can be passed to a collection or array. Background through
String[] arrs = req.getParameterValues(“cbsArr”);
getParameterValues ​​receiving array or collection parameters.
so that after the encounter, when a plurality of transfer id box would not have to fight the foreground or the background spilt toString direct use of traditional ajax properties, pass over an array, a background direct List idList to accept. Very convenient.