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input type="image" not passing VALUE?

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YelloFello

YelloFello

Programmer
Joined
Jun 30, 2003
Messages
4
Location
US
I want the user to select which video to watch by clicking on the image.


This gives me an undefined index error. (url)
<INPUT TYPE="image" SRC="image\path" VALUE="firefight" NAME="url">

This works fine.
<INPUT TYPE="submit" VALUE="firefight" NAME="url">

Seems to me the first one should work. Or am I missing the boat?
Thanks in advance.

 
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nope ur first one should work, the error u pointed out is a PHP error???

Known is handfull, Unknown is worldfull
 
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This is an HTML question, not a PHP question. It should have been asked in the HTML forum.

Images do not submit values. If you want an image to be clickable, you must surround it with an <A...>...</A> tag.



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Sorry, I guess this is an html question.

yes, the error is php.

When the user clicks an image, I want it to pass which image
was selected to

$url = $_POST['url'];

switch($url)
{
case "firefight":
$filepath = "path\firefight.avi";
break;
}


Everything I read says VALUE can be used with image type.
Oh well, I'll just work around it.
Thanks for the help.

 
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whats the form method, get or post ?

depending on that you should find either $_GET or $_POST[url] has the value you a...esent like the time, they say. - Henry's Cat.
 
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YelloFello:
I don't know what sources you're consulting but the World Wide Web Consortium's [link]web site[/url] does not list a "value" attribute for the IMG tag.

Also, the IMG tag is not a form element. As such, it's unlikely to be passing values.

If you do something like:

<a href="path/to/script.php?somename=somevalue"><IMG src="some/path"></a>

Then when that image is clicked, in the PHP script, $_GET['somename'] will have the value "somevalue".



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TANSTAAFL!!
 
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I got it working. Thanks to everyone and especially Sleipnir214.

Now I know why I have never used "image" type input. )

 
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Yeah, I dug a little deeper into the inputs of type "IMAGE". Here's what W3 has to say:

When a pointing device is used to click on the image, the form is submitted and the click coordinates passed to the server. The x value is measured in pixels from the left of the image, and the y value in pixels from the top of the image. The submitted data includes name.x=x-value and name.y=y-value where "name" is the value of the name attribute, and x-value and y-value are the x and y coordinate values, respectively.
Click to expand...

Given that information, I have a script show_post.php:
Code: 
<?php
print '<pre>';
print_r ($_POST);
?>

and test_image_input.html:
Code: 
<html>
	<body>
		<form method="POST" action="show_post.php">
			<input type="image" src="star.gif" name="the_image" value="foo">
		</form>
	</body>
</html>

Then I point a browser to test_image_input.html and click on the image, the script returns:

Code: 
Array
(
    [the_image_x] => 10
    [the_image_y] => 13
)


If you don't care where on the image the user clicks, I have a workaround.

Modifying test_image_input.php to read:

Code: 
<html>
	<body>
		<form method="POST" action="show_post.php" value="foo">
			<input type="image" src="star.gif" name="the_image[red][1][/red]">
			<input type="image" src="hdrlogo.gif" name="the_image[red][2][/red]">
		</form>
	</body>
</html>

Then when I click on the first image, the script returns:

Code: 
Array
(
    [the_image] => Array
        (
            [1] => 10
        )

)

So by examining the keys of $_POST['the_image'], you can tell on which image the user clicked, and still use an "image" input.



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TANSTAAFL!!
 
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