Just change the target. In your example _blank
means "open in a new tab or window". Try _self
:
onclick='window.open(\"student_result.php?testid={$val["testid"]}\", \"_self\")'>View Result
Here is a list of all target options:
_self: Load the response into the same HTML4 frame (or HTML5 browsing context) as the current one. This value is the default if the
attribute is not specified.
_blank: Load the response into a new unnamed HTML4 window or HTML5 browsing context.
_parent: Load the response into the HTML4 frameset parent of the current frame or HTML5 parent browsing context of the current one. If
there is no parent, this option behaves the same way as _self.
_top: In HTML4: Load the response into the full, original window, canceling all other frames. In HTML5: Load the response into the
top-level browsing context. If there is no
parent, this option behaves the same way as _self.
From MDN
Some browsers handle this differently, especially if you want to open new windows (aka. pop-ups). Please note: The other users are right. If you want to do it by best-practice, use a common link <a>
instead. This way you can also use the above target options.