duancong7573 2018-06-24 07:55
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将PHP变量回送到JavaScript变量中会在HTML中打印PHP变量

I have a HTML page with a script tag with PHP in it as follows:

<div id="myName">
<script type="text/javascript">
   var myName = <?php
   if(isset($_SESSION['name']) && $_SESSION['name'] != ''){
       echo $_SESSION['name'];
   }
   else
       echo "NotSet";
   ?>;
document.write(myName);
</script>
</div>

But running this actually prints like below:

<div id="myName">
    var myName=SomeName;
    document.write(myName);
</div>

Expected:

<div id="myName">
    SomeName
</div>

On doing inspect element:

<div id="myName">
<script type="text/javascript">
    "var myName=SomeName;
    document.write(myName);"
</script>
</div>

I want to post-process the variable myName and derive other values ahead in JS logic. So, I need to get the php value in JS variable.

Please note: I am not asking how to get a PHP variable into JS variable (for which there are many different questions on Stack Overflow). This is a different question and hence not a duplicate for those questions.

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4条回答 默认 最新

  • dongzhong8691 2018-06-24 08:21
    关注

    You could assign the PHP data as a JavaSscript variable like this - it will be available for further client side processing as desired and you can update the DOM to reflect the content using standard methods.

    <html>
    <head>
        <title>php & js vars</title>
    </head>
    <body>
    <div id='myName'>
        <script>
            <?php
                printf( 'var myName="%s";', !empty( $_SESSION['name'] ) ? $_SESSION['name'] : 'NotSet' );
            ?>
            document.getElementById('myName').innerHTML=myName;
            alert( myName );// var still available...
        </script>
    </div>
    </body>
</html>

    Update

    The above snippet was written in haste with little thought given to the various ways in which it could break, but to accommodate for double quotes you could make use of htmlentities

    <?php
    session_start();
    $_SESSION['name']='Geronimo"s Revenge';
?>
<html>
    <head>
        <title>php & js vars</title>
    </head>
    <body>
    <div id='myName'>
        <script>
            <?php
                printf( 'var myName="%s";', !empty( $_SESSION['name'] ) ? htmlentities( $_SESSION['name'], ENT_QUOTES   ) : 'NotSet' );
            ?>
            document.getElementById('myName').innerHTML=myName;
        </script>
    </div>
    </body>
</html>
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