Mhttpd.js
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About
mhttpd.js contains javascript function wrappers for most MIDAS AJAX functions typically used for implementing interactive custom pages for MIDAS experiments.
mhttpd.js is typically served by mhttpd from $MIDASSYS/resources/mhttpd.js
<html> <head> ... <script src='mhttpd.js'></script> ... </head> ... </html>
A mostly up to date copy of mhttpd.js is linked here:
An example for using all mhttpd.js functions is included in the MIDAS distribution under examples/javascript1:
- http://ladd00.triumf.ca/~daqweb/doc/midas/examples/javascript1/
- http://ladd00.triumf.ca/~daqweb/doc/midas/examples/javascript1/example.html
Functions
function getMouseXY(e) {
try {
var x = e.pageX;
var y = e.pageY;
var p = 'abs: ' + x + '/' + y;
i = document.getElementById('refimg');
if (i == null)
return false;
document.body.style.cursor = 'crosshair';
x -= i.offsetLeft;
y -= i.offsetTop;
while (i = i.offsetParent) {
x -= i.offsetLeft;
y -= i.offsetTop;
}
p += ' rel: ' + x + '/' + y;
window.status = p;
return true;
}
catch (e) {
return false;
}
}
function XMLHttpRequestGeneric() {
var request;
try {
request = new XMLHttpRequest(); // Firefox, Opera 8.0+, Safari
}
catch (e) {
try {
request = new ActiveXObject('Msxml2.XMLHTTP'); // Internet Explorer
}
catch (e) {
try {
request = new ActiveXObject('Microsoft.XMLHTTP');
}
catch (e) {
alert('Your browser does not support AJAX!');
return undefined;
}
}
}
return request;
}
function ODBSet(path, value, pwdname) {
var value, request, url;
if (pwdname != undefined)
pwd = prompt('Please enter password', );
else
pwd = ;
var request = XMLHttpRequestGeneric();
url = '?cmd=jset&odb=' + path + '&value=' + value;
if (pwdname != undefined)
url += '&pnam=' + pwdname;
request.open('GET', url, false);
if (pwdname != undefined)
request.setRequestHeader('Cookie', 'cpwd='+pwd);
request.send(null);
if (request.status != 200 || request.responseText != 'OK')
alert('ODBSet error:\nPath: '+path+'\nHTTP Status: '+request.status+'\nMessage: '+request.responseText+'\n'+document.location) ;
}
function ODBGet(path, format, defval, len, type) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jget&odb=' + path;
if (format != undefined && format != )
url += '&format=' + format;
request.open('GET', url, false);
request.send(null);
if (path.match(/[*]/)) {
if (request.responseText == null)
return null;
if (request.responseText == '<DB_NO_KEY>') {
url = '?cmd=jset&odb=' + path + '&value=' + defval + '&len=' + len + '&type=' + type;
request.open('GET', url, false);
request.send(null);
return defval;
} else {
var array = request.responseText.split('\n');
return array;
}
} else {
if ((request.responseText == '<DB_NO_KEY>' ||
request.responseText == '<DB_OUT_OF_RANGE>') && defval != undefined) {
url = '?cmd=jset&odb=' + path + '&value=' + defval + '&len=' + len + '&type=' + type;
request.open('GET', url, false);
request.send(null);
return defval;
}
return request.responseText.split('\n')[0];
}
}
function ODBMGet(paths, callback, formats) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jget';
for (var i=0 ; i<paths.length ; i++) {
url += '&odb'+i+'='+paths[i];
if (formats != undefined && formats != )
url += '&format'+i+'=' + formats[i];
}
if (callback != undefined) {
request.onreadystatechange = function()
{
if (request.readyState == 4) {
if (request.status == 200) {
var array = request.responseText.split('$#----#$\n');
for (var i=0 ; i<array.length ; i++)
if (paths[i].match(/[*]/)) {
array[i] = array[i].split('\n');
array[i].length--;
} else
array[i] = array[i].split('\n')[0];
callback(array);
}
}
}
request.open('GET', url, true);
} else
request.open('GET', url, false);
request.send(null);
if (callback == undefined) {
var array = request.responseText.split('$#----#$\n');
for (var i=0 ; i<array.length ; i++) {
if (paths[i].match(/[*]/)) {
array[i] = array[i].split('\n');
array[i].length--;
} else
array[i] = array[i].split('\n')[0];
}
return array;
}
}
function ODBGetRecord(path) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jget&odb=' + path + '&name=1';
request.open('GET', url, false);
request.send(null);
return request.responseText;
}
function ODBExtractRecord(record, key) {
var array = record.split('\n');
for (var i=0 ; i<array.length ; i++) {
var ind = array[i].indexOf(':');
if (ind > 0) {
var k = array[i].substr(0, ind);
if (k == key)
return array[i].substr(ind+1, array[i].length);
}
var ind = array[i].indexOf('[');
if (ind > 0) {
var k = array[i].substr(0, ind);
if (k == key) {
var a = new Array();
for (var j=0 ; ; j++,i++) {
if (array[i].substr(0, ind) != key)
break;
var k = array[i].indexOf(':');
a[j] = array[i].substr(k+1, array[i].length);
}
return a;
}
}
}
return null;
}
function ODBKey(path) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jkey&odb=' + path;
request.open('GET', url, false);
request.send(null);
if (request.responseText == null)
return null;
var res = request.responseText.split('\n');
this.name = res[0];
this.type = res[1];
this.num_values = res[2];
this.item_size = res[3];
this.last_written = res[4];
}
function ODBCopy(path, format) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jcopy&odb=' + path;
if (format != undefined && format != )
url += '&format=' + format;
request.open('GET', url, false);
request.send(null);
return request.responseText;
}
function ODBRpc_rev0(name, rpc, args) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jrpc_rev0&name=' + name + '&rpc=' + rpc;
for (var i = 2; i < arguments.length; i++) {
url += '&arg'+(i-2)+'='+arguments[i];
};
request.open('GET', url, false);
request.send(null);
if (request.responseText == null)
return null;
this.reply = request.responseText.split('\n');
}
function ODBRpc_rev1(name, rpc, max_reply_length, args) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jrpc_rev1&name=' + name + '&rpc=' + rpc + '&max_reply_length=' + max_reply_length;
for (var i = 3; i < arguments.length; i++) {
url += '&arg'+(i-3)+'='+arguments[i];
};
request.open('GET', url, false);
request.send(null);
if (request.responseText == null)
return null;
return request.responseText;
}
function ODBGetMsg(n) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jmsg&n=' + n;
request.open('GET', url, false);
request.send(null);
if (n > 1) {
var array = request.responseText.split('\n');
return array;
} else
return request.responseText;
}
function ODBGenerateMsg(m) {
var request = XMLHttpRequestGeneric();
var url = '?cmd=jgenmsg&msg=' + m;
request.open('GET', url, false);
request.send(null);
return request.responseText;
}
function ODBGetAlarms() {
var request = XMLHttpRequestGeneric();
request.open('GET', '?cmd=jalm', false);
request.send(null);
var a = request.responseText.split('\n');
a.length = a.length-1;
return a;
}
function ODBEdit(path) {
var value = ODBGet(path);
var new_value = prompt('Please enter new value', value);
if (new_value != undefined) {
ODBSet(path, new_value);
window.location.reload();
}
}