如何使用JavaScript计算动态生成的HTML Table中单元格中的文本框个数？
如何使用JavaScript计算动态生成的HTML Table中单元格中的文本框个数？
提问于 2019-02-15 18:35:21
我想知道在每一行的3号单元格中有多少个'text‘类型的字段。我想将它保存在一个数组中，并希望将它传递给我在Asp.NET C#中的aspx.cs页面。我能够获得一个页面内的文本框的数量，但我希望它们按照原始和单元格数进行计数。
我正在动态地生成这个表。I want to get the number of text boxes within cell for each row
场景:我有一个场景，我想要为候选人生成一份测试报告。用户将输入报告名称，当他单击加号按钮时，将为主题信息生成一个动态行(包含两个文本框)。在动态生成的原始数据中，还有一个按钮用于生成主题的子类别。我想将所有的主题和子类别插入到同一个表中，但是主题id将是子主题的父id。我希望它们在父子窗体中检索。请看一下附件中的屏幕截图。
<head id="Head1" runat="server">
<title></title>
<style type="text/css">
.TemplateTable
{
width: 80%;
margin-left: 3%;
border: 2px solid #a7a8a7;
margin-top: 30px;
padding-left: 35px;
font-size: 15px;
font-style: initial;
font-weight: bold;
color: #a7a8a7;
padding-top: 3px;
padding-bottom: 3px;
}
.TemplateTable tr td div
{
float: left;
padding-right: 10px;
font-size: 16px;
height: 22px;
}
.TemplateTable tr td div a
{
color: Blue;
}
.custom-tablePopup
{
font-family: Arial, Helvetica, sans-serif;
font-size: 13px;
margin: 10px 0 0 0;
padding: 0;
border-right: 1px solid #bebebe;
border-top: 1px solid #bebebe;
border-bottom: 1px solid #bebebe;
}
.custom-tablePopup th
{
background: #ff5c00 !important;
text-align: left;
border-left: 1px solid #bebebe;
border-bottom: 1px solid #bebebe;
padding: 5px 8px;
color: #fff;
}
.custom-tablePopup td
{
border-left: 1px solid #bebebe;
padding: 4px 8px;
}
.custom-tablePopup tr:nth-child(even)
{
background: #f8f8f8;
}
</style>
<script type="text/javascript">
var count = "1";
function addRow(in_tbl_name) {
var tbody = document.getElementById(in_tbl_name).getElementsByTagName("TBODY")[0];
// create row
var row = document.createElement("TR");
// create table cell 2
var td1 = document.createElement("TD")
var strHtml2 = "<input type=\"text\" name=\"SName\" size=\"20\" maxlength=\"30\" />";
td1.innerHTML = strHtml2.replace(/!count!/g, count);
// create table cell 3
var td2 = document.createElement("TD")
var strHtml3 = "<input type=\"text\" name=\"SScore\" size=\"10\" />";
td2.innerHTML = strHtml3.replace(/!count!/g, count);
// create table cell 4
var td3 = document.createElement("TD")
var strHtml4 = "<img src=\"../Images/cancel.jpg\" onclick=\"delRow()\" style=\"width: 22px; cursor:pointer;\" />";
td3.innerHTML = strHtml4.replace(/!count!/g, count);
// create table cell 4
var td4 = document.createElement("TD")
var strHtml5 = "<img src=\"../Images/Plus.jpg\" onclick=\"AddSubRow()\" style=\"width: 22px; cursor:pointer;\" />";
td4.innerHTML = strHtml5.replace(/!count!/g, count);
// append data to row
row.appendChild(td1);
row.appendChild(td2);
row.appendChild(td3);
row.appendChild(td4);
count = parseInt(count) + 1;
// add to count variable
// append row to table
tbody.appendChild(row);
}
function delRow() {
var current = window.event.srcElement;
//here we will delete the line
while ((current = current.parentElement) && current.tagName != "TR");
current.parentElement.removeChild(current);
}
function AddSubRow() {
var current = window.event.srcElement;
var row1 = document.createElement("TR");
// create table cell 1
var td1 = document.createElement("TD")
var strHtml2 = "<input type=\"text\" name=\"SubjectName\" size=\"20\" />";
td1.innerHTML = strHtml2.replace(/!count!/g, count);
// create table cell 2
var td2 = document.createElement("TD")
var strHtml3 = "<input type=\"text\" name=\"SubjectScore\" size=\"10\" />";
td2.innerHTML = strHtml3.replace(/!count!/g, count);
// create table cell 2
var td3 = document.createElement("TD")
var strHtml4 = "<img src=\"../Images/cancel.jpg\" onclick=\"delRow()\" style=\"width: 22px; cursor:pointer;\" />";
td3.innerHTML = strHtml4.replace(/!count!/g, count);
row1.appendChild(td1);
row1.appendChild(td2);
row1.appendChild(td3);
//here we will delete the line
//while ((current = current.parentElement) && current.tagName != "TR");
current.parentElement.appendChild(row1);
}
function Calculate() {
// var oTable = document.getElementById('tblPets');
var marks = [];
var table = document.getElementById("tblPets");
var column_count = table.rows[1].cells.length;
var rowLength = table.rows.length;
alert(document.querySelectorAll('input[type="text"]').length);
}
</script>
</head>
<body>
<form id="form1" runat="server" method="post">
<div id="dvReport" runat="server">
<table class="TemplateTable" runat="server" >
<tr>
<td>
Report Name <asp:TextBox ID="txtreportName" runat="server" Width="500px"></asp:TextBox>
</td>
<td style="float: right;">
<div>
<img id="Img1" src="~/Images/Plus.jpg" width="20" runat="server" /></div>
<div>
<a title="Add Subject" style="cursor: pointer;font-family:Arial;color:navy" onclick="addRow('tblPets')">Add Subject</a>
</div>
</td>
</tr>
</table>
</div>
<div style="margin-left: 3%;" id="dvSubject" runat="server">
<table id="tblPets" class="custom-tablePopup" runat="server">
<tr>
<th>Subject Name</th>
<th>Subject Score</th>
<th></th>
<th></th>
</tr>
<tr>
<td><input type="text" name="SName" size="20" /></td>
<td><input type="text" name="SScore" size="10" /></td>
<td><img src="../Images/Delete.png" onclick="delRow()" style="width: 22px; cursor: pointer;" /></td>
<td><img src="../Images/Plus.jpg" onclick="AddSubRow()" style="width: 22px; cursor: pointer;" /></td>
</tr>
</table>
</div>
<div>
<asp:Button ID="btnSave" runat="server" Text="Save" OnClientClick="Calculate()" OnClick="btnSave_Click" />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
</div>
<div>
<asp:Label ID="lblDisplay" runat="server"></asp:Label>
<asp:Literal ID="lit" runat="server"></asp:Literal>
</div>
</form>
</body>
回答 1
Stack Overflow用户
发布于 2019-02-15 18:43:19
您可以使用javascript QuerySelector document.querySelectorAll('.specific-class').length;向所需的元素添加特定的类
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54707447
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