使用DOM动态创建表

Question

有人能告诉我这段代码有什么问题吗？我想创建一个包含2列和3行的表，在单元格中我希望每行都有Text1和Text2。此代码创建一个包含2列和3行的表，但它只是第三行单元格中的文本（其他行为空）。

var tablearea = document.getElementById('tablearea');

var table = document.createElement('table');

var tr = [];

var td1 = document.createElement('td');
var td2 = document.createElement('td');

var text1 = document.createTextNode('Text1');
var text2 = document.createTextNode('Text2');

for (var i = 1; i < 4; i++){
    tr[i] = document.createElement('tr');   
    for (var j = 1; j < 4; j++){
        td1.appendChild(text1);
        td2.appendChild(text2);
        tr[i].appendChild(td1);
        tr[i].appendChild(td2);
    }           
    table.appendChild(tr[i]);

}

tablearea.appendChild(table);

Answer 1

您必须在循环中创建td和文本节点。您的代码只创建了2个td，因此只有2个可见。例如：

var table = document.createElement('table');
for (var i = 1; i < 4; i++){
    var tr = document.createElement('tr');   

    var td1 = document.createElement('td');
    var td2 = document.createElement('td');

    var text1 = document.createTextNode('Text1');
    var text2 = document.createTextNode('Text2');

    td1.appendChild(text1);
    td2.appendChild(text2);
    tr.appendChild(td1);
    tr.appendChild(td2);

    table.appendChild(tr);
}
document.body.appendChild(table);

Answer 2

这是因为您只创建了两个td元素和两个文本节点。

---

在循环中创建所有节点

重新创建循环中的节点：

var tablearea = document.getElementById('tablearea'),
    table = document.createElement('table');

for (var i = 1; i < 4; i++) {
    var tr = document.createElement('tr');

    tr.appendChild( document.createElement('td') );
    tr.appendChild( document.createElement('td') );

    tr.cells[0].appendChild( document.createTextNode('Text1') )
    tr.cells[1].appendChild( document.createTextNode('Text2') );

    table.appendChild(tr);
}

tablearea.appendChild(table);

---

然后在循环中创建克隆

事先创建它们，并在循环中克隆它们：

var tablearea = document.getElementById('tablearea'),
    table = document.createElement('table'),
    tr = document.createElement('tr');

tr.appendChild( document.createElement('td') );
tr.appendChild( document.createElement('td') );

tr.cells[0].appendChild( document.createTextNode('Text1') )
tr.cells[1].appendChild( document.createTextNode('Text2') );

for (var i = 1; i < 4; i++) {
    table.appendChild(tr.cloneNode( true ));
}

tablearea.appendChild(table);

---

带有文本字符串的表工厂

制作一个桌子工厂：

function populateTable(table, rows, cells, content) {
    if (!table) table = document.createElement('table');
    for (var i = 0; i < rows; ++i) {
        var row = document.createElement('tr');
        for (var j = 0; j < cells; ++j) {
            row.appendChild(document.createElement('td'));
            row.cells[j].appendChild(document.createTextNode(content + (j + 1)));
        }
        table.appendChild(row);
    }
    return table;
}

并像这样使用它：

document.getElementById('tablearea')
        .appendChild( populateTable(null, 3, 2, "Text") );

---

带有文本字符串或回调的表工厂

可以很容易地修改工厂以接受第四个参数的函数，以便以更动态的方式填充每个单元格的内容。

function populateTable(table, rows, cells, content) {
    var is_func = (typeof content === 'function');
    if (!table) table = document.createElement('table');
    for (var i = 0; i < rows; ++i) {
        var row = document.createElement('tr');
        for (var j = 0; j < cells; ++j) {
            row.appendChild(document.createElement('td'));
            var text = !is_func ? (content + '') : content(table, i, j);
            row.cells[j].appendChild(document.createTextNode(text));
        }
        table.appendChild(row);
    }
    return table;
}

像这样使用：

document.getElementById('tablearea')
        .appendChild(populateTable(null, 3, 2, function(t, r, c) {
                        return ' row: ' + r + ', cell: ' + c;
                     })
        );

Answer 3

您需要为每列创建新的TextNodes和td节点，而不是像代码那样在所有列中重复使用它们。

编辑： 像这样修改你的代码：

for (var i = 1; i < 4; i++)
{
   tr[i] = document.createElement('tr');   
      var td1 = document.createElement('td');
      var td2 = document.createElement('td');
      td1.appendChild(document.createTextNode('Text1'));
      td2.appendChild(document.createTextNode('Text2'));
      tr[i].appendChild(td1);
      tr[i].appendChild(td2);
  table.appendChild(tr[i]);
}

Answer 4

您可以创建如下的动态表行：

var tbl = document.createElement('table');
tbl.style.width = '100%';

for (var i = 0; i < files.length; i++) {

        tr = document.createElement('tr');

        var td1 = document.createElement('td');
        var td2 = document.createElement('td');
        var td3 = document.createElement('td');

        ::::: // As many <td> you want

        td1.appendChild(document.createTextNode());
        td2.appendChild(document.createTextNode());
        td3.appendChild(document.createTextNode();

        tr.appendChild(td1);
        tr.appendChild(td2);
        tr.appendChild(td3);

        tbl.appendChild(tr);
}

Answer 5

<title>Registration Form</title>
<script>
    var table;

    function check() {
        debugger;
        var name = document.myForm.name.value;
        if (name == "" || name == null) {
            document.getElementById("span1").innerHTML = "Please enter the Name";
            document.myform.name.focus();
            document.getElementById("name").style.border = "2px solid red";
            return false;
        }
        else {
            document.getElementById("span1").innerHTML = "";
            document.getElementById("name").style.border = "2px solid green";
        }

        var age = document.myForm.age.value;
        var ageFormat = /^(([1][8-9])|([2-5][0-9])|(6[0]))$/gm;

        if (age == "" || age == null) {
            document.getElementById("span2").innerHTML = "Please provide Age";
            document.myForm.age.focus();
            document.getElementById("age").style.border = "2px solid red";
            return false;
        }
        else if (!ageFormat.test(age)) {
            document.getElementById("span2").innerHTML = "Age can't be leass than 18 and greater than 60";
            document.myForm.age.focus();
            document.getElementById("age").style.border = "2px solid red";
            return false;
        }
        else {
            document.getElementById("span2").innerHTML = "";
            document.getElementById("age").style.border = "2px solid green";
        }

        var password = document.myForm.password.value;
        if (document.myForm.password.length < 6) {
            alert("Error: Password must contain at least six characters!");
            document.myForm.password.focus();
            document.getElementById("password").style.border = "2px solid red";
            return false;
        }
        re = /[0-9]/g;
        if (!re.test(password)) {
            alert("Error: password must contain at least one number (0-9)!");
            document.myForm.password.focus();
            document.getElementById("password").style.border = "2px solid red";
            return false;
        }
        re = /[a-z]/g;
        if (!re.test(password)) {
            alert("Error: password must contain at least one lowercase letter (a-z)!");
            document.myForm.password.focus();
            document.getElementById("password").style.border = "2px solid red";
            return false;
        }
        re = /[A-Z]/g;
        if (!re.test(password)) {
            alert("Error: password must contain at least one uppercase letter (A-Z)!");
            document.myForm.password.focus();
            document.getElementById("password").style.border = "2px solid red";
            return false;
        }
        re = /[$&+,:;=?@#|'<>.^*()%!-]/g;
        if (!re.test(password)) {
            alert("Error: password must contain at least one special character!");
            document.myForm.password.focus();
            document.getElementById("password").style.border = "2px solid red";
            return false;
        }
        else {
            document.getElementById("span3").innerHTML = "";
            document.getElementById("password").style.border = "2px solid green";

        }

        if (document.getElementById("data") == null)
            createTable();
        else {
            appendRow();
        }
        return true;
    }






    function createTable() {

        var myTableDiv = document.getElementById("myTable");  //indiv
        table = document.createElement("TABLE");   //TABLE??
        table.setAttribute("id", "data");
        table.border = '1';
        myTableDiv.appendChild(table);  //appendChild() insert it in the document (table --> myTableDiv)
        debugger;

        var header = table.createTHead();

        var th0 = table.tHead.appendChild(document.createElement("th"));
        th0.innerHTML = "Name";
        var th1 = table.tHead.appendChild(document.createElement("th"));
        th1.innerHTML = "Age";


        appendRow();

    }

    function appendRow() {
        var name = document.myForm.name.value;
        var age = document.myForm.age.value;


        var rowCount = table.rows.length;
        var row = table.insertRow(rowCount);

        row.insertCell(0).innerHTML = name;
        row.insertCell(1).innerHTML = age;



        clearForm();


    }


    function clearForm() {
        debugger;

        document.myForm.name.value = "";
        document.myForm.password.value = "";
        document.myForm.age.value = "";



    }
    function restrictCharacters(evt) {

        evt = (evt) ? evt : window.event;
        var charCode = (evt.which) ? evt.which : evt.keyCode;
        if (((charCode >= '65') && (charCode <= '90')) || ((charCode >= '97') && (charCode <= '122')) || (charCode == '32')) {
            return true;
        }
        else {
            return false;
        }
    }

</script>



<div>
    <form name="myForm">

        <table id="tableid">

            <tr>
                <th>Name</th>
                <td>
                    <input type="text" name="name" placeholder="Name" id="name" onkeypress="return restrictCharacters(event);" /></td>
                <td><span id="span1"></span></td>
            </tr>

            <tr>
                <th>Age</th>

                <td>
                    <input type="text" onkeypress="return event.charCode === 0 || /\d/.test(String.fromCharCode(event.charCode));" placeholder="Age"
                        name="age" id="age" /></td>
                <td><span id="span2"></span></td>
            </tr>

            <tr>
                <th>Password</th>
                <td>
                    <input type="password" name="password" id="password" placeholder="Password" /></td>
                <td><span id="span3"></span></td>
            </tr>


            <tr>
                <td></td>
                <td>
                    <input type="button" value="Submit" onclick="check();" /></td>
                <td>
                    <input type="reset" name="Reset" /></td>
            </tr>

        </table>
    </form>

    <div id="myTable">
    </div>

</div>

Answer 6

var html = "";
    for (var i = 0; i < data.length; i++){
    html +="<tr>"+
            "<td>"+ (i+1) + "</td>"+
            "<td>"+ data[i].name + "</td>"+
            "<td>"+ data[i].number + "</td>"+
            "<td>"+ data[i].city + "</td>"+
            "<td>"+ data[i].hobby + "</td>"+
            "<td>"+ data[i].birthdate + "</td>"+"<td><button data-arrayIndex='"+ i +"' onclick='editData(this)'>Edit</button><button data-arrayIndex='"+ i +"' onclick='deleteData()'>Delete</button></td>"+"</tr>";
}
$("#tableHtml").html(html);

Answer 7

当你说'appendchild'时，你实际上是将你的孩子从一个父母移到另一个父母。 你必须为每个单元格创建一个节点。

Answer 8

在我的示例中，序列号是根据使用css对每一行采取的操作进行管理的。我在每行中使用了一个表单，当创建新行时，表单将被重置。

/*auto increment/decrement the sr.no.*/
body {
    counter-reset: section;
}

i.srno {
    counter-reset: subsection;
}

i.srno:before {
    counter-increment: section;
    content: counter(section);
}
/****/

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type='text/javascript'>
    $(document).ready(function () {
        $('#POITable').on('change', 'select.search_type', function (e) {
            var selectedval = $(this).val();
            $(this).closest('td').next().html(selectedval);
        });
    });
</script>
<table id="POITable" border="1">
    <tr>
        <th>Sl No</th>
        <th>Name</th>
        <th>Your Name</th>
        <th>Number</th>
        <th>Input</th>
        <th>Chars</th>
        <th>Action</th>
    </tr>
    <tr>
        <td><i class="srno"></i></td>
        <td>
            <select class="search_type" name="select_one">
                <option value="">Select</option>
                <option value="abc">abc</option>
                <option value="def">def</option>
                <option value="xyz">xyz</option>
            </select>
        </td>
        <td></td>
        <td>
            <select name="select_two" >
                <option value="">Select</option>
                <option value="123">123</option>
                <option value="456">456</option>
                <option value="789">789</option>
            </select>
        </td>

        <td><input type="text" size="8"/></td>
        <td>
            <select name="search_three[]" >
                <option value="">Select</option>
                <option value="one">1</option>
                <option value="two">2</option>
                <option value="three">3</option>
            </select>
        </td>
        <td><button type="button" onclick="deleteRow(this)">-</button><button type="button" onclick="insRow()">+</button></td>
    </tr>
</table>

<script type='text/javascript'>
    function deleteRow(row)
    {
        var i = row.parentNode.parentNode.rowIndex;
        document.getElementById('POITable').deleteRow(i);
    }
    function insRow()
    {
        var x = document.getElementById('POITable');
        var new_row = x.rows[1].cloneNode(true);
        var len = x.rows.length;
        //new_row.cells[0].innerHTML = len; //auto increment the srno
        var inp1 = new_row.cells[1].getElementsByTagName('select')[0];
        inp1.id += len;
        inp1.value = '';
        new_row.cells[2].innerHTML = '';
        new_row.cells[4].getElementsByTagName('input')[0].value = "";
        x.appendChild(new_row);
    }
</script>

希望这有帮助。

Answer 9

在我的示例中，从按钮单击事件调用添加函数，然后从表单控件的值获取值，并调用函数generateTable。
在generateTable Function中检查是否首先生成了Table。如果表未定义，则调用generateHeader Funtion和Generate Header，然后调用addToRow函数在表中添加新行。

<input type="button" class="custom-rounded-bttn bttn-save" value="Add" id="btnAdd" onclick="add()">


<div class="row">
    <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
        <div class="dataGridForItem">
        </div>
    </div>
</div>

//Call Function From Button click Event

var counts = 1;
function add(){ 
    var Weightage = $('#Weightage').val();
    var ItemName = $('#ItemName option:selected').text();  
    var ItemNamenum = $('#ItemName').val();
    generateTable(Weightage,ItemName,ItemNamenum);
     $('#Weightage').val('');
     $('#ItemName').val(-1);
     return true;
 } 


function generateTable(Weightage,ItemName,ItemNamenum){
    var tableHtml = '';
    if($("#rDataTable").html() == undefined){
        tableHtml = generateHeader();
    }else{
        tableHtml = $("#rDataTable");
    } 
    var temp = $("<div/>");
    var row = addToRow(Weightage,ItemName,ItemNamenum);
    $(temp).append($(row));
    $("#dataGridForItem").html($(tableHtml).append($(temp).html()));
}


//Generate Header


function generateHeader(){
        var html = "<table id='rDataTable' class='table table-striped'>";
        html+="<tr class=''>";
        html+="<td class='tb-heading ui-state-default'>"+'Sr.No'+"</td>";
        html+="<td class='tb-heading ui-state-default'>"+'Item Name'+"</td>";
        html+="<td class='tb-heading ui-state-default'>"+'Weightage'+"</td>";
        html+="</tr></table>";
        return html; 
}

//Add New Row


function addToRow(Weightage,ItemName,ItemNamenum){
    var html="<tr class='trObj'>";
    html+="<td>"+counts+"</td>";
    html+="<td>"+ItemName+"</td>";
    html+="<td>"+Weightage+"</td>";
    html+="</tr>";
    counts++;
    return html;
}