Question

HY！我是网络开发的新手，只是陷入了困境。我有一个表单，其中一个下拉菜单生成2个字段。现在问题是我已经生成了一个字段并试图获得另一个字段，但由于缺乏知识，我被困住了。如果有人能

，我只需要一些帮助

<form name="myform">
    <select name="optone" size="1" onchange="setOptions(document.myform.optone.options[document.myform.optone.selectedIndex].value);">
        <option value=" " selected="selected"> </option>
        <option value="1">Directory Submission</option>
        <option value="2">Articale Submission</option>
        <option value="3">Social Bookmarking</option>
        <option value="4">Blog Commenting</option>
        <option value="5">Forum Submission</option>
        <option value="6">Link Building</option>
    </select>
    No. Of Submissions: <select name="opttwo" size="1">
        <option value=" " selected="selected">Select any option of the above first</option>
    </select>
    Amount Payable:
</td>
<td>
    <input type="text" name="amount" onchange="document.myform.opttwo.options[document.myform.opttwo.selectedIndex].value;" />

现在我的javascript是这样的：

function setOptions(chosen) {
    var selbox = document.myform.opttwo;
    selbox.options.length = 0;
    if (chosen == " ") {
        selbox.options[selbox.options.length] = new Option('Please select one of the options above first',' ');
    }
    if (chosen == "1") {
        selbox.options[selbox.options.length] = new Option('100 Directory Submission', '$9.99');
        selbox.options[selbox.options.length] = new Option('100 Directory Submission', '$9.99');
        selbox.options[selbox.options.length] = new Option('300 Directory Submission','$29.99');
    }

    // and like this other options will come too.
}

我只是想知道应付金额的领域将如何获得金额。

Answer 1

你的意思是

DEMO

function setOptions(chosen) {
    var selbox = document.myform.opttwo;
    selbox.options.length = 1; // no need to delete the first option
    if (chosen == "1") {
        selbox.options[selbox.options.length] = new Option('100 Directory Submission', '$9.99');
        selbox.options[selbox.options.length] = new Option('100 Directory Submission', '$9.99');
        selbox.options[selbox.options.length] = new Option('300 Directory Submission','$29.99');
    }
    document.myform.amount.value="";
    // and like this other options will come too.
}

使用此代码

      <select name="opttwo" size="1" onchange="this.form.amount.value=this.value;">
        <option value=" " selected="selected">Select any option of the above first</option>
      </select>
      Amount Payable:
   </td>
   <td>
     <input type="text" name="amount" readonly="readonly" />

动态表单字段随javascript更改

1 个答案: