dongtang3155 2011-03-31 13:10
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奇怪的JavaScript，PHP和Google Maps行为

I am breaking my brain in this situation :)

I have a form:

<form method="post" action="">
   <input type="hidden" name="entered_markers"
   value="<script type='text/javascript'> document.getElementById('rout_markers').value; </script>" />
 <input type="submit" value="Enter the trees you saw!" />
</p>
</form>

As you can see, the entered_markers tries to pass some JavaScript variables.

When I process the request, I do this

$chosen_markers = $_POST['entered_markers'];

Then the strange part :)

if ( empty ($chosen_markers) || !isset($chosen_markers) )  {
      $errors[] = 'Please click on the map to select spots where you spotted these tree. Markers: '.$chosen_markers;
} else {
   // Set something to signify that things are ok
}

And I always have the result that the validation thought the input was not empty, but when I tried to use that variable $rout_markers it just has nothing in it.

Where am I going wrong here? Isn't it sort of a strange thing that is happening? :)

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  • douchangmian0305 2011-03-31 19:23
    关注

    Try it by creating a JavaScript function within your head and pass the form as the parameter to parse it's input fields. I went on and created a dummy text field name "rout_markers" and gave it a value of 300. So, on your PHP side if you look for $_POST['entered_markers'] it would echo out to be 300 if you use the example below:

    <html>
<head>
<script type='text/javascript'>
    function submitCoor(form){
        form['entered_markers'].value = document.getElementById('rout_markers').value;
    }
    </script>
</head>
<body>
<input type='text' value='300' id='rout_markers' />
<form method="post" action="test.php" onsubmit="submitCoor(this)">
    <input type="hidden" name="entered_markers"
    value="" />
    <input type="submit" value="Enter the trees you saw!" />
</form>
</body>
</html>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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