Question

我正在创建一个表单，并要求候选人发布有关他们之前教育历史的信息 - 以下是表单的屏幕截图和附加到他们的代码！

这是我的javascript代码：

<script>
function removeFields1(){
//var container1 = document.getElementById("container1");
//container1.removeChild(input);


}
    function addFields1(){
        var container = document.getElementById("container1");

        var option = document.createElement("select"); //? how do I fix this up


        //option.text = "Kiwi";
        //container.add(option);
        container.appendChild(option);//? how do I fix this up


        container.appendChild(document.createTextNode("Address: "));//Address form

        var input = document.createElement("input");
        input.type = "text";
        input.id = "instaddress";
        input.name = "instaddress";
        input.size = 20;
        input.maxlenth = 20;
        container.appendChild(input);

        container.appendChild(document.createTextNode("From: "));   // which year the person started        
        var from = document.createElement("input");                 // studying in that institution
        from.type = "text";
        from.id = "from";
        from.name = "from";
        from.size = 4;
        from.maxlenth = 4;
        container.appendChild(from);

        container.appendChild(document.createTextNode("To: "));     // which year the person finished 
        var to = document.createElement("input");                   // studying in that institution
        to.type = "text";
        to.id = "to";
        to.name = "to";
        to.size = 4;
        to.maxlenth = 4;
        container.appendChild(to);

        container.appendChild(document.createTextNode(" Did You Graduate?: Yes"));    // radio buttons whether someone graduated or not          

        var grad = document.createElement("input");
        grad.type = "radio";
        grad.id = "graduate";
        grad.name = "graduate";
        grad.value = "yes"; //yes value for radio button
        container.appendChild(grad);

        container.appendChild(document.createTextNode(" No "));
        var grad1 = document.createElement("input");
        grad1.type = "radio";
        grad1.id = "graduate";
        grad.value = "no"; //no value for radio button
        container.appendChild(grad1);

        container.appendChild(document.createTextNode(" Certificate: "));

        var certificate = document.createElement("input");
        certificate.type = "text";
        certificate.id = "certificate";
        certificate.name = "certificate";
        input.size = 25;
        input.maxlenth = 25;
        container.appendChild(certificate);

        var addInstitution = document.getElementById(" Add");
        var removeInstitution = document.getElementById("Remove");
     //  container.removeChild(addInstitution);

        //create and insert input/text

        //create and insert button
        addInstitution = document.createElement("a");
        addInstitution.id="Add"
        addInstitution.href="#";
        addInstitution.text="Add";
        addInstitution.onclick=function(){addFields1();};

        removeInstitution = document.createElement("a");
        removeInstitution.id="Remove"
        removeInstitution.href="#";
        removeInstitution.text=" Remove";
        container.appendChild(addInstitution);
        container.appendChild(removeInstitution);
        //removeInstitution.onclick=function(){removeFields1();};
        //
        container.appendChild(document.createElement("br"));

    }

</script>

以下是表单字段：

    <body>
        <form>

            <div id="container1">
        <select name="institution" id="institution">
<option <?php if(isset($_POST['institution'])) { echo $_POST['institution']; } ?>>Select Institution</option>
<?php
$sql1a = "SELECT * FROM institution ORDER BY institution asc";
$smt1a = $dbs->prepare($sql1a);
$smt1a -> execute();
while($row1a=$smt1a->fetch(PDO::FETCH_ASSOC))
{
if($row1a['institution']==$_GET['id3'])
echo("<option selected value=$row1a[institution]>$row1a[institution]</option>");
else
echo("<option value=$row1a[institution]>$row1a[institution]</option>");
}
?>
</select>
Address: <input size="20" type="text" id="instaddress" name="instaddress" maxlength="20" size="20"> From:<input type="text" id="from" name="from" size="4" > To: <input type="text" id="to" name="to" size="4">
Did You Graduate?: Yes<input type="radio" onclick="checkRadio()" id="graduate" name="graduate" value="yes"> No
<input type="radio" onclick="checkRadio()" id="graduate" name="graduate" value="no"> Certificate: <input size="20" type="text" id="certificate" name="certificate" maxlength="25" size="25">

               <a href="#" id="Add" onclick="addFields1()">Add </a><br>
            </div>

        </form>
    </body>

点击addFields1()后，如何为Javascript部分创建下拉选择菜单？

下拉菜单的PHP代码如下所示 - 菜单中填充了MySQL数据库中的数据。什么是正确的

 <option <?php if(isset($_POST['institution'])) { echo $_POST['institution']; } ?>>Select Institution</option>
<?php
$sql1a = "SELECT * FROM institution ORDER BY institution asc";
$smt1a = $dbs->prepare($sql1a);
$smt1a -> execute();
while($row1a=$smt1a->fetch(PDO::FETCH_ASSOC))
{
if($row1a['institution']==$_GET['id3'])
echo("<option selected value=$row1a[institution]>$row1a[institution]</option>");
else
echo("<option value=$row1a[institution]>$row1a[institution]</option>");
}
?>
</select>

你们中的任何人都可以帮我修复Javascript代码吗？

以下是需要纠正的代码片段，以便每次按下“添加”链接时我都可以使用Javascript函数下拉菜单列表：

 var option = document.createElement("select"); //? how do I fix this up

 var option = document.createElement("select"); //? how do I fix this up
 //option.text = "Kiwi";
 //container.add(option);
 container.appendChild(option);//? how do I fix this up

Answer 1

我认为你想要做的是：

var select = document.createElement("select");

var option = document.createElement("option");
option.value = "Kiwi";
option.innerHTML = "Kiwi";

select.appendChild(option);

....但是生成这些长javascript函数并不是一个好的编程风格...函数应包含不超过20到30行代码...所以你应该考虑使用其中一个：

http://www.sitepoint.com/10-javascript-jquery-templates-engines/

或通过ajax加载整行......

使用mysql数据库中的数据填充下拉列表

1 个答案: