php - alert message displays in new window -
i want display alert message if condition fails.so used following code display message
print '<script type="text/javascript">'; print 'alert("you cannot leave field empty")'; print '</script>';
it works fine problem is, showing message in new window blank page background.i need show message in same window.please figure out way this.
thanks in advance.
show on load
print '<script type="text/javascript">'; print 'window.onload = function(){' print 'alert("you cannot leave field empty")'; print '};' print '</script>';
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