checkbox组点击事件

$.each(arrayAllSjyd, function(indexAll, itemAll){
	var chkFlg = "0";
	$.each(arraySjydSel, function(indexSel, itemSel){
		if(itemAll.split("/")[0] == itemSel.split(" ")[0]){
			result_sjyd += '<label style="margin-right: 5%"><input checked name="checkboxYdlx" type="checkbox" value="' + itemAll + '">' + '<font size="1">' + itemAll.split("/")[1] + '</font>'+ '</label>';
			chkFlg = "1";
		}
	})
	if(chkFlg == "0"){
		result_sjyd += '<label style="margin-right: 5%"><input name="checkboxYdlx" type="checkbox" value="' + itemAll + '">' + '<font size="1">' + itemAll.split("/")[1] + '</font>'+ '</label>';
	}
	if((indexAll+1) % 5 == 0){
		result += '<br>'
	}
});
$("#text_sjyd").html(result_sjyd);
	
<div class="form-group" style="display:none" id="ydfj">
	<label class="control-label col-md-2"> 疑点附件： </label>
	<div class="col-md-9">
		<div class="input-icon right">
			<button id="btn_dgContent_record" class="btn blue">
				添加
			</button>
		</div>
	</div>
</div>


$("input[name='checkboxYdlx']").live('change', function(e){
	var chklen = $("input:checkbox[name='checkboxYdlx']:checked").length;
	if(chklen > 0 ){
		 //document.getElementById("ydfj").style.visibility="visible";
                 document.getElementById("ydfj").style.display="block";
	}else{
		 //document.getElementById("ydfj").style.visibility="hidden";
                 document.getElementById("ydfj").style.display="none";
	}
});