javascript inside php

Question

How can i write a javascript alert inside php ? For example if i want to popup a javascript alert in this if condition how I can do it ?

if(isset($_POST['downloadkey'])){
                $key = $_POST['downloadkey'];
                if($key != $data['download_key']){
                    echo 'Your key is wrong.';
                    echo '<script type="text/javascript"> alert(Your downlaod key is wrong, Please try again!);</script>';
                }
            }

Thanks in advance

why is this snippet not working? on a roughly base the alert should appear if both if conditions are true. Do you render these two lines inside a valid html page? — Daxcode
– Daxcode, Commented Mar 27, 2012 at 12:39
Does the code you posted work? What happens when you run it? (There is a typo in the code, first of all. The string in the alert() needs to be wrapped in quotes.) — David
– David, Commented Mar 27, 2012 at 12:39
tough typo, haven't even seen it (credits should go to David! :)) — Daxcode
– Daxcode, Commented Mar 27, 2012 at 12:43
Why do you want to invoke JavaScript when you are already on the server side? — Amberlamps
– Amberlamps, Commented Mar 27, 2012 at 12:44
@Daxcode: Of course, if the OP simply runs the code, an error message would point out the same thing :) — David
– David, Commented Mar 27, 2012 at 12:45

Duke · Accepted Answer · 2012-03-27 12:40:20Z

5

You forgot to wrap string with quotes in alert .

"Your downlaod key is wrong, Please try again!" is a string

if(isset($_POST['downloadkey'])){
                $key = $_POST['downloadkey'];
                if($key != $data['download_key']){
                    echo 'Your key is wrong.';
                    echo '<script type="text/javascript"> alert("Your downlaod key is wrong, Please try again!");</script>';
                }
            }

answered Mar 27, 2012 at 12:40

Duke

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6 Comments

Faryal Khan Over a year ago

is it possible i remain on the same page with reloading it ?

Duke Over a year ago

@FaryalKhan If you are not redirecting to anywhere else , it will stays in same page

Faryal Khan Over a year ago

in my if condition i now added $again=1 and when I load the page it says undefined variable again why?

Duke Over a year ago

If condition is not satisfied your $agree will not set anymore

Faryal Khan Over a year ago

an if the condition is satisfied and i want to send that variable from one php file to another how can i do that ?

|

Manuel · Accepted Answer · 2012-03-27 12:42:35Z

0

You can do this by putting this alert into the onload of the body like so:

<body onload="alert('Your download key is wrong, Please try again!');">

...


</body>

answered Mar 27, 2012 at 12:42

Manuel

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