javascript - 无法计算总计以及在 html 中的表中添加/删除行

Question

我目前正在使用 http://jsfiddle.net/QAa35/ 中的示例。我尝试在 Chrome/IE 浏览器中运行代码片段，但无法获得 fiddle 中所示的结果。这是我的 index.html 中的内容，与 fiddle 完全相同:

<table class="order-list">
    <thead>
        <tr>
            <td>Product</td>
            <td>Price</td>
            <td>Qty</td>
            <td>Total</td>
        </tr>
    </thead>        
    <tbody>
        <tr>
            <td><input type="text" name="product" /></td>
            <td>$<input type="text" name="price" /></td>
            <td><input type="text" name="qty" /></td>
            <td>$<input type="text" name="linetotal" readonly="readonly"/></td>
            <td><a class="deleteRow"> x </a></td>
        </tr>
    </tbody>

    <tfoot>
        <tr>
            <td colspan="5" style="text-align: center;">
                <input type="button" id="addrow" value="Add Product" />
            </td>
        </tr>

        <tr>
            <td colspan="5">
                Grand Total: $<span id="grandtotal"></span>
            </td>
        </tr>
    </tfoot>
</table>


<script>
$(document).ready(function () {
    var counter = 1;

    $("#addrow").on("click", function () {
        counter++;

        var newRow = $("<tr>");
        var cols = "";
        cols += '<td><input type="text" name="product' + counter + '"/></td>';
        cols += '<td>$<input type="text" name="price' + counter + '"/></td>';
        cols += '<td><input type="text" name="qty' + counter + '"/></td>';
        cols += '<td>$<input type="text" name="linetotal' + counter + '" readonly="readonly"/></td>';
        cols += '<td><a class="deleteRow"> x </a></td>';
        newRow.append(cols);

        $("table.order-list").append(newRow);
    });

    $("table.order-list").on("change", 'input[name^="price"], input[name^="qty"]', function (event) {
        calculateRow($(this).closest("tr"));
        calculateGrandTotal();
    });

    $("table.order-list").on("click", "a.deleteRow", function (event) {
        $(this).closest("tr").remove();
        calculateGrandTotal();
    });
});

function calculateRow(row) {
    var price = +row.find('input[name^="price"]').val();
    var qty = +row.find('input[name^="qty"]').val();
    row.find('input[name^="linetotal"]').val((price * qty).toFixed(2));
}

function calculateGrandTotal() {
    var grandTotal = 0;
    $("table.order-list").find('input[name^="linetotal"]').each(function () {
        grandTotal += +$(this).val();
    });
    $("#grandtotal").text(grandTotal.toFixed(2));
}
</script>

但是，我无法获得总数。我也无法添加/删除行: Screenshot of results

我怎样才能让它发挥作用？

谢谢!

Answer 1

您的代码需要 jQuery。所以你只是忘记将它包含到你的项目中或者做得不正确。您只需将此脚本添加到 HTML 中即可从 cdn 导入 jQuery:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

为了证明 jQuery 一切正常，这里是导入 jQuery 的代码:

$(document).ready(function () {
    var counter = 1;

    $("#addrow").on("click", function () {
        counter++;

        var newRow = $("<tr>");
        var cols = "";
        cols += '<td><input type="text" name="product' + counter + '"/></td>';
        cols += '<td>$<input type="text" name="price' + counter + '"/></td>';
        cols += '<td><input type="text" name="qty' + counter + '"/></td>';
        cols += '<td>$<input type="text" name="linetotal' + counter + '" readonly="readonly"/></td>';
        cols += '<td><a class="deleteRow"> x </a></td>';
        newRow.append(cols);

        $("table.order-list").append(newRow);
    });

    $("table.order-list").on("change", 'input[name^="price"], input[name^="qty"]', function (event) {
        calculateRow($(this).closest("tr"));
        calculateGrandTotal();
    });

    $("table.order-list").on("click", "a.deleteRow", function (event) {
        $(this).closest("tr").remove();
        calculateGrandTotal();
    });
});

function calculateRow(row) {
    var price = +row.find('input[name^="price"]').val();
    var qty = +row.find('input[name^="qty"]').val();
    row.find('input[name^="linetotal"]').val((price * qty).toFixed(2));
}

function calculateGrandTotal() {
    var grandTotal = 0;
    $("table.order-list").find('input[name^="linetotal"]').each(function () {
        grandTotal += +$(this).val();
    });
    $("#grandtotal").text(grandTotal.toFixed(2));
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table class="order-list">
    <thead>
        <tr>
            <td>Product</td>
            <td>Price</td>
            <td>Qty</td>
            <td>Total</td>
        </tr>
    </thead>        
    <tbody>
        <tr>
            <td><input type="text" name="product" /></td>
            <td>$<input type="text" name="price" /></td>
            <td><input type="text" name="qty" /></td>
            <td>$<input type="text" name="linetotal" readonly="readonly"/></td>
            <td><a class="deleteRow"> x </a></td>
        </tr>
    </tbody>

    <tfoot>
        <tr>
            <td colspan="5" style="text-align: center;">
                <input type="button" id="addrow" value="Add Product" />
            </td>
        </tr>

        <tr>
            <td colspan="5">
                Grand Total: $<span id="grandtotal"></span>
            </td>
        </tr>
    </tfoot>
</table>