A user-created mhttpd Custom Web Page accessible from the Status Page allows the user additional flexibility. For example, a custom page may present the essential parameters of the controlled experiment in a more compact way. A custom page may even replace the default Status Page.
Custom web pages provide the user with a means of creating secondary user-created web page(s) activated within the standard MIDAS web interface. These custom pages can contain specific links to the ODB for the user to display and/or input information relevant to the experiment using a webpage. Users create Custom Pages when the standard pages do not meet their requirements completely.
Two ways of implementing custom pages are available:
- The html code is fully stored in the Online Database (ODB).
- Limited capability, size restricted.
- The page is web editable.
- Multiple custom pages are supported
- The page can be edited with an external editor.
External pages are more commonly used , so a "Custom Page" will be assumed to be an external page unless otherwise stated. All the features described for custom pages are available for both Internal and external pages.
Examples of Custom Pages
Click on the thumbnails to enlarge.
- Example 1
- This page (Figure 1) from the MEG experiment at PSI shows a complex gas system. This shows the use of "fills" and "labels". Open valves are represented as green circles, closed valves as red circles. If, for example, an open valve is clicked, the valve closes, and the circle turns red (provided the user successfully supplied the correct password).
- Example 2
- Many MIDAS experiments work with ROOT based analyzers today. One problem is that the graphical output of the root analyzer can only be seen through the X server and not through the web. At the MEG experiment, this problem was solved in an elegant way: The ROOT analyzer runs in the background, using a "virtual" X server called Xvfb. It plots its output (several panels) normally using this X server, then saves this panels every ten seconds into GIF files. These GIF files are then served through mhttpd using a custom page. The output is shown in Figure 2.
For details using Xvfb server, please contact Ryu Sawada <email@example.com>.
- Example 3
- This custom page from the Deap Experiment (Figure 3) allows the users to easily set individual channels, or a group of channels, or all channels of the SCB modules to a particular value.
Access a Custom Page
For example, if the key /Custom/myPage& (see Key names) is a custom-link, the custom-button will be
and the URL for the resulting custom page will be of the form
(see also mhttpd#usage). The special character "&" (if present) is ignored in the URL.
How to write a custom page
<title>My Custom Page Title</title>
<meta http-equiv="Refresh" content="30"> <!-- see Page Refresh -->
<link type="text/css" rel="stylesheet" href="/CS/stylesheet!" title="Stylesheet"> <!--see Custom Page Features#External stylesheet -->
<form name="form1" method="Get" action="/CS/MyPage&"> <!-- see note below -->
............spacerspacer <!-- program statements may include any of the available features -->
- Comments enclosed by HTML comment tags <!-- have been added for documentation purposes only -->
- Note the use of the HTML <form> tag with the action set to part of the URL (see above), i.e. "/CS/" followed by the custom-link. The special character "&" (if present) is ignored.
Demo Custom Page
A Demo Custom page is shown in Figure 4. The files needed to run this demo can be found in the MIDAS package in the directory ..packages/midas/examples/custom.
The file xcustom.odb contains the ODB keys needed by this demo, including the contents of the /Custom ODB tree. This demo illustrates the use of an image file myexpt.gif with superimposed fills, labels and bars. These features are not found in the code myexpt.html, but are added in the /Custom ODB tree as described in later sections. Loading the saved odb file xcustom.odb using the odbedit command ld will create all the odb keys needed for the Demo.
Features available on custom pages
See Custom Page Features.