Question

我有一个下拉菜单，可以选择使用的货币。一旦做出选择，页面将以所选货币重新加载。我希望货币选择的“标题”标签显示在新打开的网页上的文本区域中。我有代码在现有打开的页面中添加“title”标签，但这不会将它放在新加载页面的文本区域中。这可能吗？

如果可能的话，用户刷新新网页时会记住/调用文本区域中的内容。

这是两个问题，一个人知道答案，然后请不要犹豫。

到目前为止我的代码：

<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<form name="currency select" title="Currency Selector">
    <select name="currency" id="currencyList" onchange="window.document.location.href=this.options[this.selectedIndex].value;"  value="GO">
        <option value="" disabled="disabled" selected="selected" none="">$ € £</option> 
        <option value="/session/currency/usd/" title="US Dollar">USD</option>
        <option value="/session/currency/eur/" title="EURO">EUR</option>
    </select>

    <textarea id="showTitle"></textarea>

</form>
</body>
<script>
$(document).ready(function()
{
    $(document).on('change','#currencyList',function()
    {
       var result = $("option:selected",this).attr('title');
       $("#showTitle").text(result);
    });
});
</script>

Answer 1

我终于弄清楚问题是什么，这是由于直接附加在重定向页面的下拉列表上的onchange脚本（我现在已经注释掉了）。下拉列表更改时，会话数据也未更新。试试这段代码：

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<form name="currency select" title="Currency Selector">
    <select name="currency" id="currencyList"  value="GO">
        <option value="" disabled="disabled" selected="selected" none="">$ € £</option> 
        <option value="/session/currency/usd/" title="US Dollar">USD</option>
        <option value="/session/currency/eur/" title="EURO">EUR</option>
    </select>

    <textarea id="showTitle"></textarea>

</form>
<script>
   $(document).ready(function(){
    var field = document.getElementById("showTitle");
    var savedValue = sessionStorage.getItem("autosave");

    // See if we have an autosave value
    // (this will only happen if the page is accidentally refreshed)
    if (savedValue) {
    // Restore the contents of the text field
        field.value = savedValue;
        //set dropdown to session value
        $('#currencyList option[title="'+ savedValue + '"]').prop('selected', true);
    }

    // Listen for changes in the text field
    field.addEventListener("input", function() {
        // And save the results into the session storage object
        sessionStorage.setItem("autosave", this.value);
    });

   $(document).on('change','#currencyList',function(){
        //get text
       var result = $("option:selected",this).attr('title');
       //set field
       $(field).val(result);
       //set session storage item
        sessionStorage.setItem("autosave", result);
        //redirect
       window.document.location.href=this.options[this.selectedIndex].value;
    });

   });

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

Answer 2

如果您想在新页面中显示选项的标题，则应将其发送到服务器。

服务器获取该值并进行渲染，当您的新页面加载时，它会带有textarea上的值。

编辑：

您必须重新组织代码才能使用 sessionStorage 。

<select name="currency" id="currencyList" value="GO">
    <option value="" disabled="disabled" selected="selected" none="">$ € £</option> 
    <option value="/session/currency/usd/" title="US Dollar">USD</option>
    <option value="/session/currency/eur/" title="EURO">EUR</option>
</select>

<textarea id="showTitle"></textarea>


$(document).ready(function() {

    var field = document.getElementById("showTitle");

    // See if we have an autosave value
    // (this will only happen if the page is accidentally refreshed)
    if (sessionStorage.getItem("autosave")) {
        // Restore the contents of the text field
        field.value = sessionStorage.getItem("autosave");
    }

    // Listen for changes in the text field
    field.addEventListener("change", function() {
        // And save the results into the session storage object
        sessionStorage.setItem("autosave", field.value);
    });

    $(document).on('change', '#currencyList', function() {

        var result = $("option:selected", this).attr('title');

        $("#showTitle").text(result);

        window.document.location.href =  $("option:selected", this).val();
    });
});

Answer 3

新版本的代码也没有做到它应该做的事情;新加载的网页上的文本区域仍为空。

<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<form name="currency select" title="Currency Selector">
    <select name="currency" id="currencyList" onchange="window.document.location.href=this.options[this.selectedIndex].value;"  value="GO">
        <option value="" disabled="disabled" selected="selected" none="">$ € £</option> 
        <option value="/session/currency/usd/" title="US Dollar">USD</option>
        <option value="/session/currency/eur/" title="EURO">EUR</option>
    </select>

    <textarea id="showTitle"></textarea>

</form>
</body>
<script>
$(document).ready(function()
{
    $(document).on('change','#currencyList',function()
    {
       var result = $("option:selected",this).attr('title');
       $("#showTitle").text(result);
    });

  // Get the text field that we're going to track
  var field = document.getElementById("showTitle");

  // See if we have an autosave value
  // (this will only happen if the page is accidentally refreshed)
  if (sessionStorage.getItem("autosave")) {
  // Restore the contents of the text field
  field.value = sessionStorage.getItem("autosave");
  }

  // Listen for changes in the text field
  field.addEventListener("change", function() {
  // And save the results into the session storage object
    sessionStorage.setItem("autosave", field.value);

});
});
</script>

Answer 4

这是最终的代码：

EDITED

    <head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<form name="currency select" title="Currency Selector">
    <select name="currency" id="currencyList" onchange="window.document.location.href=this.options[this.selectedIndex].value;"  value="GO">
        <option value="" disabled="disabled" selected="selected" none="">TEST</option> 
        <option value="/session/currency/usd/" title="US Dollar">USD</option>
        <option value="/session/currency/eur/" title="EURO">EUR</option>
    </select>

    <textarea id="showTitle"></textarea>

</form>

<script>
      $(document).ready(function(){
    var field = document.getElementById("showTitle");
    var savedValue = sessionStorage.getItem("autosave");

    // See if we have an autosave value
    // (this will only happen if the page is accidentally refreshed)
    if (savedValue) {
    // Restore the contents of the text field
        field.value = savedValue;
        //set dropdown to session value
        $('#currencyList option[title="'+ savedValue + '"]').prop('selected', true);
    }

    // Listen for changes in the text field
    field.addEventListener("input", function() {
        // And save the results into the session storage object
        sessionStorage.setItem("autosave", this.value);
    });

   $(document).on('change','#currencyList',function(){
        //get text
       var result = $("option:selected",this).attr('title');
       //set field
       $(field).val(result);
       //set session storage item
        sessionStorage.setItem("autosave", result);
        //redirect
       //window.document.location.href=this.options[this.selectedIndex].value;
    });

   });

</script>
    </body>

如何在新加载的页面上进行（下拉）操作？

4 个答案: