Access a PHP array from JavaScript
I have the following code where I declare a PHP array variable and inside a function, I put some data into the array. I also display buttons mapped to each index of the array that will show the data in the PHP array for that index number.
When testing on a browser, I don't get the right answer. I checked the page source, it had code like data_array = ["<?php echo implode ('',Array); ?>"]; instead of the text from the Array.
What am I doing wrong and what should I do to get the correct output? (BTW, I tried to execute the same without declaring the function and it seemed to work, but I need a function for my work and can't take that approach).
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
<html lang="en">
<head>
<title>Example</title>
<?php
$giant_says = array();
function display() {
global $giant_says;
$giant_says[] = "<a href='http://www.google.com'>Google</a>";
$giant_says[] = "Yahoo!";
$giant_says[] = "Bing";
echo "<di开发者_如何学JAVAv id='content'>";
echo $giant_says[0];
echo "</div><br><br>";
$i = 0;
while($i < count($giant_says)) {
echo "<input type='button' value='".$i."' onClick=\"addtext(".$i.");return false;\"";
$i += 1;
}
}
?>
<script type="text/javascript">
function addtext(index) {
giantSays = ["<?php echo implode ('","', $giant_says); ?>"];
document.getElementById('content').innerHTML = giantSays[index];
}
</script>
</head>
<body>
<?php
display();
?>
</body>
</html>
You have the order wrong, which is causing the implode() to compress an empty array. I also suggest using json_encode() instead of implode(). It exists for this type of thing - updated example below:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
<html lang="en">
<head>
<title>Example</title>
<?php
$giant_says = array();
function display(&$giant_says) {
// Calculate the array (referenced)
$giant_says[] = "<a href='http://www.google.com'>Google</a>";
$giant_says[] = "Yahoo!";
$giant_says[] = "Bing";
// Return the HTML, to display later
ob_start();
echo "<div id='content'>";
echo $giant_says[0];
echo "</div><br><br>";
$i = 0;
while($i < count($giant_says)) {
echo "<input type='button' value='".$i."' onClick=\"addtext(".$i.");return false;\">";
$i += 1;
}
$Return = ob_get_contents();
ob_end_clean();
return $Return;
}
$Display = display($giant_says);
?>
<script type="text/javascript">
function addtext(index) {
giantSays = <?php echo json_encode($giant_says); ?>;
document.getElementById('content').innerHTML = giantSays[index];
}
</script>
</head>
<body>
<?php
echo $Display;
?>
</body>
</html>
You're trying to implode the $giant_says array before you've filled it (you're calling display() after the implode when the call needs to happen before).
The problem is that you call the display method, that fills the content after the html part with the javascript is sended.
the html code is "like" making an "echo 'html'" from your php. Your html is already processed but the display method is not called. call the method before the html code.
Example:
<?php
$giant_says = array();
$giant_says[] = "<a href='http://www.google.com'>Google</a>";
$giant_says[] = "Yahoo!";
$giant_says[] = "Bing";
function display() {
global $giant_says;
echo '<div id="content">'.$giant_says[0]."</div><br><br>";
$i = 0;
while($i < count($giant_says)) {
echo "<input type='button' value='".$i."' onClick=\"addtext(".$i.");\" />";
$i += 1;
}
}
?>
<html>
<head>
<title>Example</title>
<script type="text/javascript">
function addtext(index) {
giantSays = ["<?php echo implode ('","', $giant_says); ?>"];
document.getElementById('content').innerHTML = giantSays[index];
return false;
}
</script>
</head>
<body>
<?php display(); ?>
</body>
</html>
加载中,请稍侯......
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