Strange JavaScript, PHP and Google Maps behavior
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 = $_POST['entered_开发者_JAVA技巧markers'];
Then the strange part :)
if ( empty ($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? :)
Replace $rout_markers with $chosen_markers
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>
Try this:
<form method="post" action="" onsubmit="document.getElementById('entered_markers').value = document.getElementById('rout_markers').value;">
<p>
<input type="hidden" name="entered_markers" id="entered_markers" value="" />
<input type="submit" value="Enter the trees you saw!" />
</p>
</form>
Edit: and replace $rout_markers with $chosen_markers as suggested by webarto.
The code below will probably explain what you could be doing wrong.
$errors = array();
if (
isset($_POST['entered_markers']) // make sure the variable is available
) {
if (
is_string($_POST['entered_markers']) // make sure the data type is string (could be array when form is manipulated)
) {
$markers = trim($_POST['entered_markers']); // trim whitespace and store it in a var
if ($markers !== "") { // if the string is NOT empty
echo "Input given!";
// At this point you could add some more validation to check whether the given input is also what you expect it to be.
// Preform a regexp for lat/lng for example.
echo $markers;
} else {
$errors[] = "Parameter 'entered_markers' is empty.";
}
} else {
$errors[] = "Parameter 'entered_markers' is not a string.";
}
} else {
$errors[] = "Parameter 'entered_markers' is not found.";
}
print_r($errors);
加载中,请稍侯......
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