loading graphs with a form on the same HTML page - html

Question

I have an HTML page where, using a form, I pass a variable to a PHP page which generates a graph.
The graph is loaded with JpGraph, a powerful tool that creates img.
Given the following form, I load four different graphs passing four different values.
As you can see, the graphs are redirected to new tabs in the browser (target="_blank"):
<form method="POST" action="graph.php" target="_blank">
<select name="eti">
<option value="04" selected> graph with input value 4
<option value="06"> graph with input value 6
<option value="08"> graph with input value 8
<option value="11"> graph with input value 11
</select>
<input type="submit" name="tag" value="load graph" />
</form>
I wonder if it is possible to dynamically load the four graphs on the same HTML page, right below the form (instead of redirecting them to different tabs).
Do I need Javascript to do that? Any tips are welcome.

Answer 1

I found a way using iframe:
<form class="forms" method="POST" action="graph.php" target="iframe">
<select name="eti">
<option value="" selected> - scegli un tag -
<option value="04"> tag 4
<option value="06"> tag 6
<option value="08"> tag 8
<option value="10"> tag 10
</select>
<input type="submit" name="tag" value="load graph" />
</form>
<div class="embed-container">
<iframe name="iframe" width="400" height="350" frameborder="0" allowfullscreen>
<img src="graph.php" />
</iframe>
</div>
In addition to this, some CSS formatting was needed.