Javascript in php not working

Question

I'm trying to make the page go back when the user presses the OK button on the alert box. The alert box appears but it doesn't go back to the previous page

Would i have to use a confirm window because i don't want to provide the cancel option, i just want a window to appear so the user has to click OK and it goes back to the previous page

print '<script type="text/javascript">';
print 'alert("Invalid please try again.")';
print 'history.back();';
print '</script>';

Just to provide a little more information I'm doing this after OR

$link =mysqli_connect(*sensitive info*) OR  print '<script type="text/javascript">';
    print 'alert("Invalid please try again.")';
    print 'history.back();';
    print '</script>'; 
exit();

score 2 · Accepted Answer · answered Mar 21 '14 at 12:23

2

Try this, You have missed to add ;

 print '<script type="text/javascript">';
 print 'alert("Invalid please try again.");';
                                 .........^
 print 'history.back();';
 print '</script>';

answered Mar 21 '14 at 12:23

Krish R

22,583
7
50
59

This still doesn't work, the message comes up but it doesn't go back – user3166873 Mar 21 '14 at 12:27
is semicolon important in js? I think it isn't – Farnabaz Mar 21 '14 at 12:28
@ Farnabaz Yes, You need to use. http://stackoverflow.com/questions/444080/do-you-recommend-using-semicolons-after-every-statement-in-javascript – Krish R Mar 21 '14 at 12:29
@Farnabaz — There are times when the semi-colon can be omitted, doing so is considered bad practise, and this isn't one of them anyway. – Quentin Mar 21 '14 at 12:31
@KrishR i change code to this and it works `print 'alert("Invalid please try again.")'."\n";` – Farnabaz Mar 21 '14 at 12:32
This fixed it thanks to Krish R and Farnabaz but when the password is correct it still does this :/ – user3166873 Mar 21 '14 at 12:45

score 1 · Answer 2 · answered Mar 21 '14 at 12:23

1

I think you're missing a semicolon ; after alert().

print '<script type="text/javascript">';
print 'alert("Invalid please try again.");';
print 'history.back();';
print '</script>';

answered Mar 21 '14 at 12:23

magnetronnie

505
3
16

score 0 · Answer 3 · answered Mar 21 '14 at 12:25

You have missed the ';' after your alert

print '<script type="text/javascript">';
print 'alert("Invalid please try again.");';
print 'history.back();';
print '</script>';

To find our errors in code you can use websites such as http://www.jslint.com/ to catch these errors easily.

score 0 · Answer 4 · answered Mar 21 '14 at 12:34

0

echo "<script type=\"text/javascript\">"; 
echo "alert(\"Invalid please try again.\")"; 
echo "window.location= \"/*Write ur page Link Here*/\""; 
echo "</script>";

Hope above code will work for you. and yeah ";" is missing after your alert line.

answered Mar 21 '14 at 12:34

iDhavalVaja

153
1
10

Javascript in php not working

4 Answers4