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<html>
<head>
<meta http-equiv="Pragma" content="no-cache"/>
<meta http-equiv="Cache-Control" content="no-cache"/>
<meta http-equiv="Expires" content="-1" />
<title>Web Services - Sample 05: Using XMLHttpRequest from JavaScript</title>
<style><!--
a{text-decoration:none;
padding: 1px;
background-color: #dddddd}
--></style>
<script type="text/javascript">
function newRequest() { // return a new request object
request = null;
if (window.XMLHttpRequest)
request = new XMLHttpRequest();
else if (window.ActiveXObject)
request = new ActiveXObject('Microsoft.XMLHTTP');
if (request == null) alert('No XMLHttpRequest support');
return request;
}
function cmd(suffix) { // apply synchronously and return JSON result
req = newRequest();
req.open('get',
'/apply/pymol.cmd.' + suffix +
( suffix.indexOf('?') < 0 ? '?' : '&') +
"_ts=" + new Date().getTime(),
false); // synchronous
req.setRequestHeader("Accept", "application/json");
req.send("");
if (req.status == 500) {
alert("PyMOL Exception:\n" + eval('(' + req.responseText + ')').join("\n"));
return null;
}
return eval('(' + req.responseText + ')');
}
function alignAll() { // Javascript loop which performs the alignment
var obj_list = cmd("get_names"); // get current objects
for(i=1;i<obj_list.length;i++) { // align all to first object
result = cmd("align?mobile=" + obj_list[i] + "////CA" +
"&target=" + obj_list[0] + "////CA");
}
if(obj_list.length) {
cmd("center?selection=" + obj_list[0]); // recenter on first object
}
}
function refreshTable()
{
var obj_list = cmd("get_names");
var enabled = cmd("get_names?enabled_only=1");
var table = document.getElementById("obj_table");
var body = table.tBodies[0];
var nTableRows = body.rows.length;
var nListRows = obj_list.length;
var i = 0;
updateRow = function(row,name,enabled) {
method = 'enable';
for(j=0;j<enabled.length;j++) {
if (enabled[j]==name) {
method = 'disable';
break;
}
}
row.cells[0].innerHTML = name;
row.cells[1].innerHTML = "<a href=\"javascript:void(0)\" onclick=\"cmd('" +
method+"?name="+name+"');refreshTable();\">"+method+"</a>";
row.cells[2].innerHTML = "<a href=\"javascript:void(0)\" onclick=\"cmd('" +
"show_as?representation=sticks&selection=organic and "+name+"')\">ligand as sticks</a>";
row.cells[3].innerHTML = "<a href=\"javascript:void(0)\" onclick=\"cmd('" +
"orient?selection=organic and "+name+"&animate=2')\">orient ligand</a>";
row.cells[4].innerHTML = "<a href=\"javascript:void(0)\" onclick=\"cmd('" +
"show?representation=lines&selection=byres "+name+" within 5 of (organic and "+name+")')\">show binding site</a>";
row.cells[5].innerHTML = "<a href=\"javascript:void(0)\" onclick=\"cmd('" +
"delete?name="+name+"'); refreshTable();\">delete</a>";
}
while ((i<nTableRows) && (i<nListRows)) {
updateRow(body.rows[i], obj_list[i], enabled);
i++;
}
while (i<nListRows) {
body.insertRow(-1);
var row = body.rows[i];
row.insertCell(0);
row.insertCell(0);
row.insertCell(0);
row.insertCell(0);
row.insertCell(0);
row.insertCell(0);
updateRow(row, obj_list[i], enabled);
i++;
}
while (i<nTableRows) {
body.deleteRow(nTableRows-1);
nTableRows--;
}
return false;
}
function loadPDB(code)
{
return cmd('load?filename=$PYMOL_PATH/modules/web/examples/data/'+code+'.pdb');
}
</script>
</head>
<body onload="refreshTable()">
<h3>Web Services - Sample 05: Using XMLHttpRequest from JavaScript</h3>
<p> Now we complicate the situation by relying upon the XMLHttpRequest
method which sits at the heart of AJAX.
TODO: change tone to explain why this is beneficial
However, in this example, we
stick with simple synchronous requests which can return results and
state information from PyMOL.</p>
<a href="/apply/_quit">quit pymol</a>
(FireFox only: <a href="javascript:void(0)" onclick="window.open('view-source:' + location.href)">view page source</a>)
<p><b>Structures</b></p>
<pre>
<a href="javascript:void(0)"
onclick="loadPDB('1iqj'); refreshTable();">loadPDB('1iqj'); refreshTable();</a>
<a href="javascript:void(0)"
onclick="loadPDB('2fzz'); refreshTable();">loadPDB('2fzz'); refreshTable();</a>
<a href="javascript:void(0)"
onclick="loadPDB('2g00'); refreshTable();">loadPDB('2g00'); refreshTable();</a>
<a href="javascript:void(0)"
onclick="loadPDB('missing'); refreshTable();">loadPDB('missing'); refreshTable();</a> (will display Python exception / traceback)
<a href="javascript:void(0)" onclick="cmd('delete?name=all'); refreshTable();">cmd('delete?name=all'); refreshTable();</a>
</pre>
<p>Likewise, the table below is updated from JavaScript, based on what objects are currently loaded inside PyMOL.</p>
<p>TODO make these buttons behave better</p>
<table id="obj_table" border=1><tbody></tbody></table>
<pre><a href="javascript:void(0)" onclick="refreshTable()">refreshTable()</a></pre>
<p>The alignAll command source below illustrates how you can program
PyMOL from JavaScript using synchronous requests which return JSON object
results from PyMOL that are then subsequently acted upon.</p>
<pre>
function alignAll() { // Javascript loop which performs the alignment
var obj_list = cmd("get_names"); // get current objects
for(i=1;i<obj_list.length;i++) { // align all to first object
result = cmd("align?mobile=" + obj_list[i] + "////CA" +
"&target=" + obj_list[0] + "////CA");
}
if(obj_list.length) {
cmd("center?selection=" + obj_list[0]); // recenter on first object
}
}
</pre>
<p><b>Actions</b></p>
<pre>
<a href="javascript:void(0)" onclick="cmd('zoom?animate=2')">cmd('zoom?animate=2')</a>
<a href="javascript:void(0)" onclick="cmd('show_as?representation=ribbon')">cmd('show_as?representation=ribbon')</a>
<a href="javascript:void(0)" onclick="alignAll()">alignAll()</a>
</pre>
</body>
</html>
|
