MarvinSketch Example - Student Examination

	This example shows how MarvinSketch can be used in online examinations in different subjects. This examination example tests the knowledge of students related to lone pairs and radical electrons. Task: Use the two lowermost multifunctional buttons of the toolbar on the left to explicitely define the lone pairs and radical electrons on atoms. After drawing the molecule, use the 'Submit Answer' button below the MarvinSketch window to generate its ChemAxon Extended SMILES format. Note that the MarvinSketch applet was configured to better suit the task, for example the Lewis-structure representation is always visible. For more details please see the Technical background part below.

Technical background

In this example the MarvinSketch applet is customized with the help of parameters. The following changes were made:

• The main menubar is disabled.
• The contextual menu of atoms is disabled.
• The toolbar on the left hand side contains 2 multifunctional buttons for setting lone-pair electrons and radical electrons.
• The bottom template toolbar contains only the "Rings" and a custom "Generic" template groups. The function to modify the visible template groups on-the-fly is disabled.
• The Ctrl-O shortcut is disabled to prevent opening structure files.
• The visibility of implicit hydrogen atoms is switched off.
• The automatic calculation of lone-pair electrons is switched off, and the number of lone pairs is set to 0 at each atom as default.
• The automatic calculation and display of valence errors is switched off.
• The C label is always visible on Carbon atoms.

The code of the customized applet is as follows:

<script LANGUAGE="JavaScript1.1" SRC="../../../../marvin.js"></script>
<script LANGUAGE="JavaScript1.1">

<!--
msketch_name = "MSketch";
msketch_begin("../../../..", 490, 420);
msketch_param("menuconfig", "/examples/applets/sketch/studentexam/menuconfig.xml");
msketch_param("lonePairsAutoCalc", "false");
msketch_param("lonePairsVisible", "true");
msketch_param("sketchCarbonVisibility", "on");
msketch_param("implicitH", "off");
msketch_param("valenceErrorVisible", "false");
msketch_param("shortcuts", "/examples/applets/sketch/studentexam/shortcuts.xml");
msketch_param("ttmpls0", "*Generic*/examples/applets/sketch/studentexam/generic.csmol");
msketch_param("ttmpls1", "*Rings*chemaxon/marvin/templates/rings.t");
msketch_param("templateToolbarCustomizable", "false");
msketch_end();

//-->
</script>

The menu configuration file: menuconfig.xml
The shortcut configuration file: shortcuts.xml
Custom "Generic" template group file: generic.csmol

The 'Submit Answer' button generates the ChemAxon Extended Smiles. The u option was used to generate unique smiles.

    <script LANGUAGE="JavaScript1.1" SRC="../../../../marvin.js"></script>
    <script LANGUAGE="JavaScript1.1">

        function exportMol(format) {
                if(document.MSketch != null) {
                        var s = document.MSketch.getMol(format);
                        // Convert "\n" to local line separator
                        s = unix2local(s);
                        document.MolForm.MolTxt.value = s;
                } else {
                        alert("Cannot import molecule:\n"+
                              "no JavaScript to Java communication"+
                              "in your browser.\n");
                }
        }

    </script>
    
    ... // creating HTML form
        <input TYPE=BUTTON VALUE="Submit Answer"
                  onClick="exportMol('cxsmiles:u')">
    ... // creating HTML form