Question

我想在这个论坛上寻求人们的专业建议，这些建议是我花了几天时间试图解决但却无济于事。

你看，我发布后无法在表单中检索所选选项的值，即使我能看到chrome developer中发布的值，它也会返回空白。我尝试删除iframe标记，然后立即看到select标记中的已发布值。我希望保持iframe标签不变，以便我的表单值在发布后保持不变。在保留iframe标记的同时，我尝试在标记之后移动php标记，但发布的选择值仍为空白。我想知道使用jquery自动填充select选项是否会导致任何问题。

请参阅下面的代码。谢谢。

    <html>
    <head>
    <meta charset="utf-8">
    <style>

    .hide{ position:absolute; top:-1px; left:-1px; width:1px; height:1px; }

    </style>
            <link rel="stylesheet" href="css/datepicker.css">
            <link rel="stylesheet" href="css/bootstrap.css">
            <link rel="stylesheet" href="jquery-ui.css">
            <script src="jquery.js"></script>
            <script src="jquery-ui.js"></script>  
    </head>
    <body> 
    <iframe name="hiddenFrame" class="hide"></iframe>
    <form method="post" action="" target="hiddenFrame">
    <p><label class="field" for="empdob">DateOfBirth:</label>Day<select name="dobday" id="dobday"></select>Month<select name="dobmonth" id ="dobmonth"></select>Year<select name="dobyear" id="dobyear"></select></p>
    <p><input type="submit" name="submit" value="Submit"></p>
    </form>
    <?php
         if(!empty($_POST['dobday'])) {
                    $dobday=$_POST['dobday'];
                  echo $_POST['dobday'];
            } 

                    if(!empty($_POST['dobmonth'])) {
                    $dobmonth=$_POST['dobmonth'];
                    echo $_POST['dobmonth'];
            } 

                    if(!empty($_POST['dobyear'])){
                    $dobyear=$_POST['dobyear'];
                  echo $_POST['dobyear'];
            }

                        if((!empty($_POST['dobyear'])) && (!empty($_POST['dobmonth'])) && (!empty($_POST['dobday']))) {
                             $datecombine=$dobday.$dobmonth.$dobyear; 
                                echo $datecombine;
                                $dobemp=DateTime::createFromFormat('jnY', $datecombine);
                                echo $dobemp->format('Y-m-d');
                        }   
    ?>

            <script>
       $(function() {
    var startyr = new Date().getFullYear();
    var endyr = startyr - 100;
        //populate our years select box
        for (i = startyr; i > endyr; i--){
            $('#dobyear').append($('<option />').val(i).html(i));
        }
        //populate our months select box
        for (i = 1; i < 13; i++){
            $('#dobmonth').append($('<option />').val(i).html(i));
        }
        //populate our Days select box
        updateNumberOfDays(); 

        //"listen" for change events
        $('#dobyear, #dobmonth').change(function(){ 
            updateNumberOfDays(); 
        });

    });

    //function to update the days based on the current values of month and year
    function updateNumberOfDays(){
        $('#dobday').html('');
        month = $('#dobmonth').val();
        year = $('#dobyear').val();
        days = daysInMonth(month, year);

        for(i=1; i < days+1 ; i++){
                $('#dobday').append($('<option />').val(i).html(i));
        }
    }

    //helper function
    function daysInMonth(month, year) {
        return new Date(year, month, 0).getDate();
    }

            </script>
    </body>
    </html>

在帖子php

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