Question

我有一个多维数组，不会填充所有元素。我想将该数组的内容输出到HTML表中。我目前有这个：

for (var basketRowJuice = 0; basketRowJuice < 10; basketRowJuice++){
    var outputName = "";
    outputName = (basketArray[0][basketRowJuice]);
    document.getElementById("basketJuiceName" + basketRowJuice).innerHTML = outputName;
}

for (var basketRowQuant = 0; basketRowQuant < 10; basketRowQuant++){
    var outputQuant = 0;
    outputQuant = (basketArray[1][basketRowQuant]);
    document.getElementById("basketJuiceQuant" + basketRowQuant).innerHTML = outputQuant;
}

for (var basketRowPrice = 0; basketRowPrice < 10; basketRowPrice++){
    var outputPrice = 0;
    outputPrice = (basketArray[2][basketRowPrice]);
    document.getElementById("basketJuicePrice" + basketRowPrice).innerHTML = outputPrice;
}

HTML表格：

<table id="basket" cellpadding="0" cellspacing="0" summary="This table lists the items you have in your shopping basket">
                                <caption>Your basket</caption>
                                <tr>
                                    <th scope="col">Juice name</th>
                                    <th scope="col">Number of crates</th>
                                    <th scope="col">Total price</th>
                                </tr>
                                <tr>
                                    <td id="basketJuiceName0"></td>
                                    <td id="basketJuiceQuant0"></td>
                                    <td id="basketJuicePrice0"></td>
                                </tr> 
                                <tr>
                                    <td id="basketJuiceName1"></td>
                                    <td id="basketJuiceQuant1"></td>
                                    <td id="basketJuicePrice1"></td>
                                </tr>   
                                <tr>
                                    <td id="basketJuiceName2"></td>
                                    <td id="basketJuiceQuant2"></td>
                                    <td id="basketJuicePrice2"></td>
                                </tr>
                                <tr>
                                    <td id="basketJuiceName3"></td>
                                    <td id="basketJuiceQuant3"></td>
                                    <td id="basketJuicePrice3"></td>
                                </tr> 
                                <tr>
                                    <td id="basketJuiceName4"></td>
                                    <td id="basketJuiceQuant4"></td>
                                    <td id="basketJuicePrice4"></td>
                                </tr>  
                                <tr>
                                    <td id="basketJuiceName5"></td>
                                    <td id="basketJuiceQuant5"></td>
                                    <td id="basketJuicePrice5"></td>
                                </tr>  
                                <tr>
                                    <td id="basketJuiceName6"></td>
                                    <td id="basketJuiceQuant6"></td>
                                    <td id="basketJuicePrice6"></td>
                                </tr>  
                                <tr>
                                    <td id="basketJuiceName7"></td>
                                    <td id="basketJuiceQuant7"></td>
                                    <td id="basketJuicePrice7"></td>
                                </tr>  
                                <tr>
                                    <td id="basketJuiceName8"></td>
                                    <td id="basketJuiceQuant8"></td>
                                    <td id="basketJuicePrice8"></td>
                                </tr>  
                                <tr>
                                    <td id="basketJuiceName9"></td>
                                    <td id="basketJuiceQuant9"></td>
                                    <td id="basketJuicePrice9"></td>
                                </tr>
                            </table>

但是，如果我的数组只填充在[0] [9]，[1] [9]和[2] [9]列中，那么在输出之前，我的HTML结果会出现一大块空行。任何人都可以提出更好的方法吗？也许这样我的javascript为每个填充的数组元素插入一个表行？

我是编程的新手所以请原谅我毫无疑问的冗长和不雅的代码。

谢谢你，乔恩

Answer 1

您可能想要在循环中更像以下内容。

var outputPrice = basketArray[2][basketRowPrice];
if (outputPrice) {
    // do something here.  the if statement will be true for non-null, non-empty, non-zero values of the var outputPrice.
}

我还会注意到你可以将你的3个循环替换为：

for (var j = 0; j < 10; j++) {
    for (var i = 0; i < 3; i++) {
        var outputName = basketArray[i][j];
        var outputQuant = basketArray[1][basketRowQuant];
        //.. do the rest of the code
    }
}

最后一步是删除硬编码的HTML并动态生成它，以下是没有检查的，所以它可能有点偏差，查找DOM方法。

var tbody = document.getElementById('basket').tbodies[0];
for (var j = 0; ...) {
    var tr = document.createElement('tr');
    tbody.appendChild(tr);
    for (var i = 0; ..) {
        var td = document.createElement('td');
        td.innerHTML = ...;
        tr.appendChild(td);
    }
}

Javascript：如果填充了数组元素，则为数组的每个元素插入表行

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