如何允许用户添加提交到php文件的另一个输入行

Question

我制作了一个简单的GPA(平均成绩点)计算器,我只是在玩一些东西,并且非常想知道如何让用户随意添加行.我能找到这样做的最好例子是在这个网站上:http://gpacalculator.net/high-school-gpa-calculator/

我想我可能会理解当用户点击按钮时,jquery函数可以添加一行但是我如何得到它所以每次有人添加行时输入元素的名称都不同.php文件将如何知道$ _POST ['someName']的名称.

简而言之:如何使用jquery添加行,然后将该表单提交到php文件,使其与预制行不同.

为了防止你需要知道,我将发送到php文件的值存储在变量中.然后将它们输入到计算GPA的公式中.

编辑这里是表的代码:

<table>
    <form id = "myform" name = "myform" method = "POST" action = "">
        <tr> 
            <th> Grade in test </th> 
            <th> Weight of grade </th> <br />
         </tr>
        <tr> <td><input type = "text" name = "grade1" /> </td> <td> <input type = "text" name = "weight1"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade2" /> </td> <td> <input type = "text" name = "weight2"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade3" /> </td> <td> <input type = "text" name = "weight3"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade4" /> </td> <td> <input type = "text" name = "weight4"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade5" /> </td> <td> <input type = "text" name = "weight5"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade6" /> </td> <td> <input type = "text" name = "weight6"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade7" /> </td> <td> <input type = "text" name = "weight7"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade8" /> </td> <td> <input type = "text" name = "weight8"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade9" /> </td> <td> <input type = "text" name = "weight9"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade10" /> </td> <td> <input type = "text" name = "weight10"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade11" /> </td> <td> <input type = "text" name = "weight11"  /> </td> </tr>
        <tr> <td><input type = "text" name = "grade12" /> </td> <td> <input type = "text" name = "weight12"  /> </td> </tr>

<tr> 
  <td> <div id = "submitButton">
          <input type = "submit" value = "SUBMIT"  style = " font-family:'HelveticaNeue-Light', 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; padding: 10px;border: none; color: white; background-color: #0499ff; width: 100%; font-size: 13px; border-radius: 5px;""/></div></td> <td> <input type = "reset"  /> </td></tr>

    </form>
    </table>
     <div id = "results2"></div>
</div>

然后PHP文件中的代码切换到初始变量:

/* GRADES VARS */
$grade1 = $_POST['grade1'];
$grade2 = $_POST['grade2'];
$grade3 = $_POST['grade3'];
$grade4 = $_POST['grade4'];
$grade5 = $_POST['grade5'];
$grade6 = $_POST['grade6'];
$grade7 = $_POST['grade7'];
$grade8 = $_POST['grade8'];
$grade9 = $_POST['grade9'];
$grade10 = $_POST['grade10'];
$grade11 = $_POST['grade11'];
$grade12 = $_POST['grade12'];


/* GRADE WEIGHT VARS */
$weight1 = $_POST['weight1'];
$weight2 = $_POST['weight2'];
$weight3 = $_POST['weight3'];
$weight4 = $_POST['weight4'];
$weight5 = $_POST['weight5'];
$weight6 = $_POST['weight6'];
$weight7 = $_POST['weight7'];
$weight8 = $_POST['weight8'];
$weight9 = $_POST['weight9'];
$weight10 = $_POST['weight10'];
$weight11 = $_POST['weight11'];
$weight12 = $_POST['weight12'];

谢谢!

Answer 1

所以基本上你需要使用字段名作为数组,所以采取这个例子:

<input type="text" name="someName[]" value="0" />
<input type="text" name="someName[]" value="2" />
<input type="text" name="someName[]" value="4" />
<input type="text" name="someName[]" value="6" />

当您执行提交并将值发布到服务器时,您将能够使用PHP作为数组访问它们,如下所示:

echo $_POST['someName'][0]; // outputs 0
echo $_POST['someName'][1]; // outputs 2
echo $_POST['someName'][2]; // outputs 4
echo $_POST['someName'][3]; // outputs 6

既然你不知道有多少行可以循环它:

foreach($_POST['someName'] as $someName){
    echo $someName; //will output the value 0/2/4/6 depending on the iteration
}

使用javascript添加按钮时,您只需要确保名称相同并带括号:

$('#addButton').click(function(){
    $('.container').append('<input type="text" name="someName[]" value="someNumber" />');
});

只要您拥有该输入并且输入位于可以提交的表单标记内,这将起作用.

根据您添加到初始答案中的代码进行编辑,我建议您利用PHP中的数组.

所以假设你使用像我上面解释的输入(顺便说一下,这可以用于任何可以发布到后端的HTML元素[复选框,输入,文本,选择等等]).你可以这样做:

$grades = array();
foreach($_POST['grade'] as $g){
    $grades[] = $g; // add grade from each input to the array
}

// then you can manipulate the data through looping through it.
foreach($grades as $grade){
    // do something here with each grade...whether it be manipulating it
    // or adding it another array with some changes whatever.
}

这应该允许你清理代码,你可以用权重做同样的事情.