从动态元素中获取数据

Question

在提交表单之前尝试从动态元素中获取数据以计算持续时间。

如图所示，我有 第1天工作正常，但第2天不计算小时数。不知道为什么会这样。一旦我点击添加另一天但对如何修复第一个问题感兴趣，也无法编辑第1天。

＆＃13;

＆＃13;

		var template;
		var numOfSegments = 1;

		window.addEventListener('load', function() {
			template = document.querySelector("#wrapper").innerHTML;
			document.querySelector("#more_fields").addEventListener("click", function(e) {
				e.preventDefault(); // tell the browser to not send the form
				document.getElementById('wrapper').insertAdjacentHTML('beforeend', template); // add next segment
				numOfSegments = document.querySelectorAll("div.segment").length;
				document.querySelector("div.segment:last-of-type > label").innerHTML = "Day " + (numOfSegments) + ":"; //Updates Segment #
			});
		})


		function deleteMe() {
			if (numOfSegments > 1) {
				var btn = document.querySelector("#wrapper > div.segment:last-of-type");
				btn.remove();
				event.preventDefault();
			}
		}

		function addNumSeg() {
			var elem = document.getElementById("segments_num");
			elem.value = ++numOfSegments;
		}

		function subtractNumSeg() {
			var elem = document.getElementById("segments_num");
			if (numOfSegments > 1) {
				elem.value = --numOfSegments;
			}
		}

＆＃13;

		<div id='segments_num' value=1 >
		<form id="seg" oninput="z.value=parseInt(segout.value)-parseInt(segin.value)">
		<div id="room_fileds">
			<div class="content" id="wrapper">
				<div class="segment">
					<label id="seg[]" style="margin:0 0 10px 60px;display: inline;">Day 1:</label>
					<div class="form-group" style="display: inline;">
						<label id=seg-in[] style="margin:0 0 10px 35px;display: inline;">IN:</label>
						<input class="form-control seg_in" id="segin" type="text" style="margin:0 0 10px 5px;Width:15%;display: inline;">
					</div>
					<div class="form-group" style="display: inline;">
						<label id=seg-out[] style="margin:0 0 10px 35px;display: inline;">OUT:</label>
						<input class="form-control seg_out" id="segout" type="text" style="margin:0 0 10px 5px;Width:15%;display: inline;">
					</div>
					<div class="form-group" style="display: inline;">
						<label id="seg-dur[]" style="margin:0 0 10px 35px;display: inline;">Duration:</label>
						<output class="form-control seg_out" form="seg" name="z" for="segin segout" style="margin:0 0 10px 5px;Width:15%;display:inline"; readonly></output>
					</div>
				</div>
			</div>
		</div>
		</div>

		<div style="text-align:right;">
			<div style="display:inline;text-align: right;">
				<button onclick="deleteMe(); subtractNumSeg();" type="button" style="height: 25px;width:14px;" id="less_fields">-</button>
			</div>

			<div style="display:inline;text-align: right;">
				<button onclick="addNumSeg();" type="button" style="height: 25px;width:14px;" id="more_fields">+</button>
			</div>
		</div>
		<br><br>
		<button type="button" class="btn btn-default" id="formSubmit">Submit</button>

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