I have the following problem:
I'm using JavaScript to set a input type hidden in a modal window. Now I need to assign the value that was filled in this field to a PHP variable. I'm not using any form, just the field alone. I tried the following code that does not work:
<?php
$x = "<script>document.write(bookId)</script>";
echo $x;
?>
How do I get the value of this field and assign it to the variable?
Well, come on!
When will you access this value in your PHP file? If you are not accessing that value in PHP just store it in a Javascript variable (a global).
To define a global variable, simply declare it outside some function or (1), if the statement is in a function, you should not use var (2). Ex:
1:
var valor = 10;
function foo() {
return 'bar';
}
2:
function foo() {
valor = 10;
return 'bar';
}
In case you really need to access this value in your PHP file, simply set the value of the input to the value of PHP and add a id to identify the field (if you make an Ajax request) name to receive such value in your PHP file.
Ex:
<input type="hidden" id="meuValor" name="nameValor" value="<?php echo $valor; ?>" />
And, after already having such a value in your HTML just call functions in events, for example, onClick of some button, someKey onKeyPress, etc.
I hope to have helped, hugs.