Alert pop up using AJAX

[Bernt_R]

Hi guys,

Does anyone know how to make an alert pop up from an PHP script using AJAX?

I have a price calculator that sets many choices and if two choices don't match I want a window alert with an error message.

I can make so an error text is shown printed on the page together with the result but is it possible to have a window.alert('Wrong choice ') from inside the php script or from the .js file?

Appreciates all help.

[skinnybloke]

Hi - did you find a way to do this?

[ankifreeze]

can you provide your script?

[venegal]

I can't believe that you guys all have the same problem, and I don't even get what it's about. Have the PHP script generate an alert? Why would you want to do that? That's the most user-unfriendly type of server-side validation I can think of.

And even if you really want to do it, although it's certainly a silly thing to do, what's the problem, really? Just let your PHP script write out the Javascript; there's nothing to it.

Edit: I just reread the original post and saw that this is about AJAX, and I get it even less now. You can do whatever you want in the AJAX callback, so why not just alert something, if you feel that's what you must do?

[skinnybloke]

This is code called by the AJAX submit. The PHP messages display fine.

There are several things this script will need to do:

1. Alert if a reference number has not been entered
2. Alert if the reference number does not exist on the database
3. Provide an option to choose between SALES or RENTAL details if this property is for sale and for rent
4. Open the PHP within the same window for the selected choice.

PHP Code:


    $idRefNo = $_POST['idRefNo'];

    if (!isset($_POST['submit'])) { 


        require_once('../Connections/TestWebServer.php');

    
        //GET PROPERTY DETAILS
        $query = "SELECT  DISTINCT * FROM property WHERE property.Title = '".$idRefNo."' AND suspend != 'Yes'";
        $result = @mysql_query ($query);                
        if ($result) { // If the query runs ok

            if ($result != "") {
                while ($row = mysql_fetch_array ($result, MYSQL_ASSOC)) { 
                    
                    if ($row["BaseRental"] > 0 AND $row["Saleprice"] > 0) {
                        echo 'This property is for RENT and for SALE <br/>';
                    } else if ($row["BaseRental"] > 0) {
                    echo 'This property is for RENT only <br/>';
                        echo '<script type="text/javascript">alert(\'Hello\');</script>';
                        
                    } else if ($row["Saleprice"] > 0) {
                        echo 'This property is for SALE only <br/>';
                    } else {
                        echo 'DOH! What is going on here!!! <br/>';
                    }
                }

                } else { // This line is actioned if the query fails
                    $message = '<p>We are unable to display the event information due to a system error.</p><p>' . mysql_error() . '</p>';
                }
            } else {
                echo 'This property does not exist';
            }

        // mysql_free_result ($result); // Free up the resources

        // echo $message; // Display any error messages
    } 


[venegal]

PHP Code:

echo '<script type="text/javascript">alert(\'Hello\');</script>'; 


This would only work if the page would be normally loaded by the browser, not when it's an AJAX response that's manually added to the DOM.

The right thing to do in this case would be to not return HTML but a JSON object that contains the response as well as additional data that you can use on the client side in order to figure out whether to alert something, and what to alert.

[skinnybloke]

Thanks for the reply - I'll give that a go.