刷新页面后保留输入值

2022-08-30 19:37:35

我有一个带有输入字段的表单,此输入包含一个下拉菜单,从数据库中读取信息。如果用户输入值,当他到达下拉菜单时,他找不到他想要的内容,他会转到另一个页面将此信息添加到下拉菜单中,然后转到第一页以继续输入信息。如果他转到另一个页面将信息添加到下拉菜单,我该如何保留此信息,以及如何在将信息添加到下拉菜单后找到此信息而无需刷新和提交。

这是带有表单的第一页

<form name='' method='post' action='<?php $_PHP_SELF ?>'>
<input name='txt_name' id='' type='text'>

从数据库读取此下拉菜单

 <select id="groups" name="txt_label" class="form-control">
   ';?>
     <?php 
    $sql=mysqli_query($conn,"select DISTINCT db_label from tbl_label")or die(mysqli_error($conn));
 echo'<option  value="">-- Select --</option>';
    while($row=mysqli_fetch_array($sql)){
        $label=$row['db_label'];
        echo "<option value='$label'>$label</option>"; 
    }echo'</select>';?><?php echo'
  </div>
</form>

另一页中的第二个表单

<form class="form-inline" role="form" name="form" method="post" action="';?><?php $_PHP_SELF ?><?php echo'">
    <div class="form-group">
    <label for="pwd">Label</label>
  <input id="txt_label" name="txt_label" type="text" placeholder="Label" class="form-control input-md">
  </div>
   <div class="form-group">
    <label for="pwd">Sub Label</label>
  <input id="txt_sublabel" name="txt_sublabel" type="text" placeholder="SubLabel" class="form-control input-md">
  </div>
   <input type="submit" name="addlabel" value="Add" class="btn btn-default">';

答案 1

编辑:保留更多输入的值

网页:

<input type="text" id="txt_1" onkeyup='saveValue(this);'/> 
<input type="text" id="txt_2" onkeyup='saveValue(this);'/> 

Javascript:

<script type="text/javascript">
        document.getElementById("txt_1").value = getSavedValue("txt_1");    // set the value to this input
        document.getElementById("txt_2").value = getSavedValue("txt_2");   // set the value to this input
        /* Here you can add more inputs to set value. if it's saved */

        //Save the value function - save it to localStorage as (ID, VALUE)
        function saveValue(e){
            var id = e.id;  // get the sender's id to save it . 
            var val = e.value; // get the value. 
            localStorage.setItem(id, val);// Every time user writing something, the localStorage's value will override . 
        }

        //get the saved value function - return the value of "v" from localStorage. 
        function getSavedValue  (v){
            if (!localStorage.getItem(v)) {
                return "";// You can change this to your defualt value. 
            }
            return localStorage.getItem(v);
        }
</script>

答案 2

如果上面的代码不起作用,请尝试以下操作:

<input type="text" id="txt_1" onchange='saveValue(this);'/> 
<input type="text" id="txt_2" onchange='saveValue(this);'/>