/* * This set of Javascript functions provides general utilities for the system. None * of the functions in this file are directly related to look and feel. It is strongly * recommended NOT to modify these functions. */ /* * Hook to be called whenever a page is loaded. * Override this to provide functionality. */ function onLoad() { // Do nothing } /* * Hook to be called whenever a page is resized. * Override this to provide functionality. */ function onResize() { // Do nothing } /* * Hook to be called whenever a page is left. * Override this to provide functionality. */ function onUnload() { // Do nothing } /* * Hook to be called whenever a form is submitted. * Override this to provide functionality. */ function onSubmit() { return true; } /* * This is the basic action-delegation method called to submit forms to EDU. * Most button clicks result in a call to this function. */ function doAction(action) { var frm = document.forms["edu_form"]; frm.elements.actionID.value = action; if (onSubmit()) { frm.submit(); } } /* * Read a question response from a Java applet that conforms to the contract of * Java question type. */ function readAppletItems() { var form = document.edu_form; var elts = form.elements; var pattern = /ans\.(\d+)\.(\d+)/; for (var i=0; i"); d.writeln(" "); d.writeln(" "); d.writeln(" "); d.writeln(""); d.close(); d.forms[0].submit(); w.focus(); } /* * Provide help for a user in one of the system roles of instructor, student, administrator, or proctor. */ function getHelp(what) { var winspec = "scrollbars,resizable,width=800,height=600"; var help; // The definitions of the help urls are in helpURLs.js if (what == "instructor") { help = INSTRUCTOR_HELP_URL; } else if (what == "administrator") { help = SYSADMIN_HELP_URL; } else if (what == "proctor") { help = PROCTOR_HELP_URL; } else if (what == "inline_editor") { help = INLINE_EDITOR_HELP_URL; } else if (what == "math_symbol_mode") { help = MATH_SYMBOL_MODE_HELP_URL; } else if (what == "math_text_mode") { help = MATH_TEXT_MODE_HELP_URL; } else if (what == "chem_symbol_mode") { help = CHEM_SYMBOL_MODE_HELP_URL; } else if (what == "chem_text_mode") { help = CHEM_TEXT_MODE_HELP_URL; } else { help = ASSIGNMENT_TYPE_HELP_URL; } window.open(getBaseURL() + help, "helpWindow", winspec); } /* * Set the crumb trail for the current page. Depending on the look and feel of the system, * this function may not server any purpose. */ function setCrumbTrail(trail) { var t; if (document.getElementById && (t = document.getElementById("crumb_trail"))) { t.innerHTML = trail; } } /* * Utility method. Not called from outside this package. */ function getMaplePlotURL(maple, plot, type, libname, driver) { var url = getBaseURL() + "modules/mapleTA.plotserver.PlotServer" + "?maple=" + myEscape(maple) + (plot != null ? "&plot=" + myEscape(plot) : "") + (type != null ? "&type=" + myEscape(type) : "") + (libname != null ? "&libname=" + myEscape(libname) : "") + ((driver == null || driver.length ==0) ? "" : "&plotdriver=" + myEscape(driver)); return url; } /* * Create a plot using the provided Maple code. * Utility method. Not called from outside this package. */ function drawMaplePlot(maple, width, height, libname, driver) { var url = getMaplePlotURL(maple, null, null, libname, driver); document.write(""); } /* * Create a popup plot of Maple code. */ function popupMaplePlot(maple, plot, type, libname, driver) { var url = getMaplePlotURL(maple, plot, type, libname, driver); var w = window.open("", "maplepopup", "width=500,height=380,scrollbars=no,resizable=no"); var d = w.document; d.open("text/html"); d.writeln(""); d.writeln(""); d.writeln(""); d.writeln(""); d.writeln("

"); d.writeln(""); d.writeln(""); d.close(); w.focus(); } /* * Utility method to perform URL escaping since there are problems with the Javascript * built-in function. */ function myEscape(s) { var a = escape(s); var b = ""; for (i=0; i"); d.writeln(""); d.writeln(""); d.writeln(""); d.writeln(''); d.writeln(''); d.writeln('

'); d.writeln(msg); d.writeln('

'); d.writeln(""); d.writeln(""); d.close(); w.focus(); } var _preview = null; var _previewEq = null; function previewFormula(f) { var platf = navigator.platform; var useJava = (platf != null) && (platf.indexOf("Win32") == 0 || platf.indexOf("Linux") == 0); _previewEq = null; _previewEq = f; if (useJava) { if (_preview == null || _preview.closed) { _preview = window.open("", "previewer", "previewer", "scrollbars,resizable"); if (_preview.setEquation != null) { _preview.setEquation(f); } else { _preview = window.open(getBaseURL() + "modules/preview/", "previewer"); _preview.resizeTo(350,200); } window.focus(); } else { _preview.setEquation(f); } } else { var b = myEscape(f); window.open("preview.Preview?eq=" + b, "previewer", "width=300,height=175,resizable"); } } function previewChemistry(f) { var b = myEscape(f); window.open("preview.Preview?actionID=chemistry&eq=" + b, "previewer", "width=300,height=175,resizable"); } /* * Holds a pointer to an inline question's webeq input control applet. * Used by popupMathToolbar() (below) and the JS in mathEditor/toolbar.html. */ var _math_toolbar_target; /* * Pop up a toolbar window which writes templates to a webeq IC. Used * by the Inline question. */ function popupMathToolbar(name) { _math_toolbar_target = document[name + ".sro"]; window.open("mathEditor/toolbar.html", "math_editor_toolbar", "width=240,height=50").focus(); } /* * Pop up a toolbar window which writes templates to a webeq IC. Used * by the Inline question. */ function popupChemToolbar(name) { _math_toolbar_target = document[name + ".sro"]; window.open("mathEditor/chem_toolbar.html", "math_editor_toolbar", "width=240,height=50").focus(); } /* * Popup describing EDU server, version, etc. */ function aboutPopup() { window.open("diagnostics.Version", "version_info", "width=500,height=300,resizable,scrollbars"); } /* * Warning that the session timeout is close to expiring. */ function warnOfImminentSessionTimeout(k) { clearInterval(_sessionTimeoutTimerID); var timestamp = new Date(); self.focus(); window.focus(); alert("DISCONNECTION WARNING\n\n" + "You may be in danger of losing your work on this page. The internet server\n" + "that sent this question to you needs a reply. To save your work and continue\n" + "working, do the following within the next " + (k/(60*1000)) + " minutes:\n\n" + "1) Click the Next or Back button above.\n\n" + "2) When the new question appears, click the Back or Next button to return to this\n" + "question. Your work will be saved and you can then continue to enter responses\n" + "on this page.\n\n" + "(If the Next or Back buttons are greyed out, click the Save & Quit button. You\n" + "will have to log-in again to return to this question, but your work will be preserved.)\n\n" + "Message time: " + (new Date()).toLocaleString()); } var _sessionTimeoutTimerID = 0; function startSessionTimeoutWarningTimer(timeout) { var k = 5*60*1000; var t = timeout - k; if (t < 0) { t = timeout/2; } _sessionTimeoutTimerID = setInterval("warnOfImminentSessionTimeout(" + k + ")", t); } /* * Get a handle to the object matching the given name */ function findObj(n, d) { var p,i,x; if(!d) d=document; if((p=n.indexOf("?")) > 0 && parent.frames.length) { d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p); } if(!(x=d[n]) && d.all) x=d.all[n]; for (i=0; !x && i < d.forms.length; i++) x = d.forms[i][n]; for(i=0; !x && d.layers && i < d.layers.length; i++) x = findObj(n,d.layers[i].document); if(!x && d.getElementById) x = d.getElementById(n); return x; } /* * Change the visibility of the style element to be hidden */ function hide(objName) { obj = findObj(objName); if (obj.style) { obj.style.visibility='hidden'; } } /* * Change the visibility of the style element to be visible */ function show(objName) { obj = findObj(objName); if (obj.style) { obj.style.visibility='visible'; } }