在PHP变量中获取Javascript变量值 [英] Get Javascript Variable value in PHP variable

问题描述

< pre class =snippet-code-js lang-js prettyprint-override> var val; $（'select'）。on（'change'，function（）{alert（this.value）; val = this.value;}）<？phpecho $ variable =< script> document.write（val） < / script>;？>

 <选择> < option value =1> One< / option> < option value =2>两个< / option> < option value =3> Three< / option> < option value =4> four< / option>< / select>  

我想获取所选框的值并将其保存在PHP变量中。我想保存并回显 val 变量。请帮助

解决方案

将此代码用于使用变量

 <？php 
 session_start（）; 
 echo $ _SESSION ['php_value']; 
？> 
< script src =https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js>< / script> 
< script> 
函数getValue（obj）{
 var value = obj.value; 
 $ .ajax（{
 type：POST，
 url：'edit.php'，
 data：val =+ value，
 dataType： 'text'，
 async：false，
 cache：false，
 success：function（result）{
 window.location.reload（）; 
} 
}）; 
} 
 
< / script> 
 
< select onchange =getValue（this）> 
< option value =1<？php if（$ _ SESSION ['php_value'] == 1）echo'selected';？>> One< / option> 
< option value =2<？php if（$ _ SESSION ['php_value'] == 2）echo'selected';？>> Two< / option> 
< option value =3<？php if（$ _ SESSION ['php_value'] == 3）echo'selected';？>> Three< / option> 
< option value =4<？php if（$ _ SESSION ['php_value'] == 4）echo'selected';？>> four< / option> 
 
< / select> 
  

然后创建edit.php文件

 <？php 
 session_start（）; 
 $ _SESSION ['php_value'] = $ _REQUEST ['val']; 
？> 
  

    var val;
    $('select').on('change', function() {
        alert( this.value );
        val = this.value;
    })
    
    <?php
echo $variable = "<script>document.write(val)</script>";
?>

<select>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
    <option value="4">four</option>

</select>

I want to get the value of the selected box and save it in a PHP variable. I want to save and echo val variable. Please help

解决方案

use this code for use variable

  <?php
  session_start();
  echo $_SESSION['php_value'];
  ?>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script>
    function getValue(obj){
    var value = obj.value;
    $.ajax({
        type:"POST",
        url: 'edit.php',
        data: "val="+ value,
        dataType: 'text',
        async: false,
        cache: false,
        success: function ( result )  {
            window.location.reload();
        }
    });
}

</script>

<select onchange="getValue(this)">
<option value="1" <?php if($_SESSION['php_value'] == 1) echo 'selected';?>>One</option>
<option value="2" <?php if($_SESSION['php_value'] == 2) echo 'selected';?>>Two</option>
<option value="3" <?php if($_SESSION['php_value'] == 3) echo 'selected';?>>Three</option>
<option value="4" <?php if($_SESSION['php_value'] == 4) echo 'selected';?>>four</option>

</select>

then create edit.php file

<?php
 session_start();
 $_SESSION['php_value'] = $_REQUEST['val'];
?>

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