moodle/lib/javascript-static.js

// Miscellaneous core Javascript functions for Moodle

function popupchecker(msg) {
    var testwindow = window.open('itestwin.html', '', 'width=1,height=1,left=0,top=0,scrollbars=no');
    if (testwindow == null)
        {alert(msg);}
    else {
        testwindow.close();
    }
}

function popUpProperties(inobj) {
  op = window.open();
  op.document.open('text/plain');
  for (objprop in inobj) {
    op.document.write(objprop + ' => ' + inobj[objprop] + '\n');
  }
  op.document.close();
}

function fillmessagebox(text) {
  document.form.message.value = text;
}

function copyrichtext(textname) {
/// Legacy stub for old editor - to be removed soon
  return true;
}

function checkall() {
  void(d=document);
  void(el=d.getElementsByTagName('INPUT'));
  for(i=0;i<el.length;i++)
    void(el[i].checked=1)
}

function checknone() {
  void(d=document);
  void(el=d.getElementsByTagName('INPUT'));
  for(i=0;i<el.length;i++)
    void(el[i].checked=0)
}

function lockoptions(form, master, subitems) {
  // Subitems is an array of names of sub items.
  // Optionally, each item in subitems may have a
  // companion hidden item in the form with the
  // same name but prefixed by "h".
  if (eval("document."+form+"."+master+".checked")) {
    for (i=0; i<subitems.length; i++) {
      unlockoption(form, subitems[i]);
    }
  } else {
    for (i=0; i<subitems.length; i++) {
      lockoption(form, subitems[i]);
    }
  }
  return(true);
}

function lockoptionsall(formid) {
  var lock=new Object();
  var items=eval(formid+'items');
  var form=document.forms[formid];
  for (var master in items){
      var subitems=items[master].dependents;
      var thislock;
      if (items[master].condition=='notchecked'){
          thislock=!form.elements[master].checked;
      } else if (items[master].condition=='checked'){
          thislock=form.elements[master].checked;
      } else if  (items[master].condition=='noitemselected'){
          thislock=(form.elements[master].selectedIndex==-1);
      } else if  (items[master].condition=='eq'){
          thislock=(form.elements[master].value==items[master].value);
      } else {
          thislock=(form.elements[master].value!=items[master].value);

      }

      for (var i=0; i<subitems.length; i++) {
        if (lock[subitems[i]]!=null){
          lock[subitems[i]] = thislock || lock[subitems[i]];
        }else{
          lock[subitems[i]] = thislock;
        }
      }

      for (var item in lock) {
          form.elements[item].disabled=lock[item];
      }
  }
  return(true);
}

function lockoptionsallsetup(formid) {
  var items=eval(formid+'items');
  var form=document.forms[formid];
  for (var i = 0; i < form.elements.length; i++){
      var found=false;
      var formelement = form.elements[i];
      if (formelement.type=='reset'){
          formelement.onclick = function(){this.form.reset();return lockoptionsall(this.form.getAttribute('id'));};
          formelement.onblur = function(){this.form.reset();return lockoptionsall(this.form.getAttribute('id'));};
          formelement.onchange = function(){this.form.reset();return lockoptionsall(this.form.getAttribute('id'));};
      } else {
          for (var master in items){
              if (master==formelement.name){
                  formelement.onclick = function(){return lockoptionsall(this.form.getAttribute('id'));};
                  formelement.onblur = function(){return lockoptionsall(this.form.getAttribute('id'));};
                  formelement.onchange = function(){return lockoptionsall(this.form.getAttribute('id'));};
                  break;
              }
          }
      }
      if (found){
      }
  }

  return lockoptionsall(formid);
}

function lockoption(form,item) {
  eval("document."+form+"."+item+".disabled=true");/* IE thing */
  if(document.forms[form].elements['h'+item]) {
    eval("document."+form+".h"+item+".value=1");
  }
}

function unlockoption(form,item) {
  eval("document."+form+"."+item+".disabled=false");/* IE thing */
  if(document.forms[form].elements['h'+item]) {
    eval("document."+form+".h"+item+".value=0");
  }
}

function submitFormById(id) {
    var theform = document.getElementById(id);
    if(!theform) {
        return false;
    }
    if(theform.tagName != 'FORM') {
        return false;
    }
    if(!theform.onsubmit || theform.onsubmit()) {
        return theform.submit();
    }
}

function select_all_in(elTagName, elClass, elId) {
    var inputs = document.getElementsByTagName('INPUT');
    inputs = filterByParent(inputs, function(el) {return findParentNode(el, elTagName, elClass, elId);});
    for(var i = 0; i < inputs.length; ++i) {
        if(inputs[i].type == 'checkbox' || inputs[i].type == 'radio') {
            inputs[i].checked = 'checked';
        }
    }
}

function deselect_all_in(elTagName, elClass, elId) {
    var inputs = document.getElementsByTagName('INPUT');
    inputs = filterByParent(inputs, function(el) {return findParentNode(el, elTagName, elClass, elId);});
    for(var i = 0; i < inputs.length; ++i) {
        if(inputs[i].type == 'checkbox' || inputs[i].type == 'radio') {
            inputs[i].checked = '';
        }
    }
}

function confirm_if(expr, message) {
    if(!expr) {
        return true;
    }
    return confirm(message);
}


/*
    findParentNode (start, elementName, elementClass, elementID)

    Travels up the DOM hierarchy to find a parent element with the
    specified tag name, class, and id. All conditions must be met,
    but any can be ommitted. Returns the BODY element if no match
    found.
*/
function findParentNode(el, elName, elClass, elId) {
    while(el.nodeName != 'BODY') {
        if(
            (!elName || el.nodeName == elName) &&
            (!elClass || el.className.indexOf(elClass) != -1) &&
            (!elId || el.id == elId))
        {
            break;
        }
        el = el.parentNode;
    }
    return el;
}
/*
    findChildNode (start, elementName, elementClass, elementID)

    Travels down the DOM hierarchy to find all child elements with the
    specified tag name, class, and id. All conditions must be met,
    but any can be ommitted.
    Doesn't examine children of matches.
*/
function findChildNodes(start, tagName, elementClass, elementID, elementName) {
    var children = new Array();
    for (var childIndex in start.childNodes) {
        var classfound = false;
        var child = start.childNodes[childIndex];
        if((child.nodeType == 1) &&//element node type
                  (elementClass && (typeof(child.className)=='string'))){
            var childClasses = child.className.split(/\s+/);
            for (var childClassIndex in childClasses){
                if (childClasses[childClassIndex]==elementClass){
                    classfound = true;
                    break;
                }
            }
        }
        if( (child.nodeType == 1) &&//element node type
            (!tagName || child.nodeName == tagName) &&
            (!elementClass || classfound)&&
            (!elementID || child.id == elementID) &&
            (!elementName || child.name == elementName))
        {
            children = children.concat(child);
        } else {
            children = children.concat(findChildNodes(child, tagName, elementClass, elementID, elementName));
        }
    }
    return children;
}
/*
    elementSetHide (elements, hide)

    Adds or removes the "hide" class for the specified elements depending on boolean hide.
*/
function elementShowAdvanced(elements, show) {
    for (var elementIndex in elements){
        element = elements[elementIndex];
        element.className = element.className.replace(new RegExp(' ?hide'), '')
        if(!show) {
            element.className += ' hide';
        }
    }
}

function showAdvancedOnClick(button, hidetext, showtext){
    var toSet=findChildNodes(button.form, null, 'advanced');
    var buttontext = '';
    if (button.form.elements['mform_showadvanced_last'].value == '0') {
        elementShowAdvanced(toSet, true);
        buttontext = hidetext;
        button.form.elements['mform_showadvanced_last'].value = '1';
    } else {
        elementShowAdvanced(toSet, false);
        buttontext = showtext;
        button.form.elements['mform_showadvanced_last'].value = '0';
    }
    var formelements = button.form.elements;
    for (var i in formelements){
        if (formelements[i].name=='mform_showadvanced'){
            formelements[i].value = buttontext;
        }
    }
    //never submit the form if js is enabled.
    return false;
}

/*
    elementToggleHide (element, elementFinder)

    If elementFinder is not provided, toggles the "hidden" class for the specified element.
    If elementFinder is provided, then the "hidden" class will be toggled for the object
    returned by the function call elementFinder(element).

    If persistent == true, also sets a cookie for this.
*/
function elementToggleHide(el, persistent, elementFinder) {
    if(!elementFinder) {
        var obj = el;
    }
    else {
        var obj = elementFinder(el);
    }
    if(obj.className.indexOf('hidden') == -1) {
        obj.className += ' hidden';
        var shown = 0;
    }
    else {
        obj.className = obj.className.replace(new RegExp(' ?hidden'), '')
        var shown = 1;
    }

    if(persistent == true) {
        new cookie('hide:' + obj.id, 1, (shown ? -1 : 356), '/').set();
    }
}


function elementCookieHide(id) {
    var obj  = document.getElementById(id);
    var cook = new cookie('hide:' + id).read();
    if(cook != null) {
        elementToggleHide(obj, false);
    }
}

function filterByParent(elCollection, parentFinder) {
    var filteredCollection = [];
    for(var i = 0; i < elCollection.length; ++i) {
        var findParent = parentFinder(elCollection[i]);
        if(findParent.nodeName != 'BODY') {
            filteredCollection.push(elCollection[i]);
        }
    }
    return filteredCollection;
}

/*
    All this is here just so that IE gets to handle oversized blocks
    in a visually pleasing manner. It does a browser detect. So sue me.
*/

function fix_column_widths() {
    var agt = navigator.userAgent.toLowerCase();
    if ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1)) {
        fix_column_width('left-column');
        fix_column_width('right-column');
    }
}

function fix_column_width(colName) {
    if(column = document.getElementById(colName)) {
        if(!column.offsetWidth) {
            setTimeout("fix_column_width('" + colName + "')", 20);
            return;
        }

        var width = 0;
        var nodes = column.childNodes;

        for(i = 0; i < nodes.length; ++i) {
            if(nodes[i].className.indexOf("sideblock") != -1 ) {
                if(width < nodes[i].offsetWidth) {
                    width = nodes[i].offsetWidth;
                }
            }
        }

        for(i = 0; i < nodes.length; ++i) {
            if(nodes[i].className.indexOf("sideblock") != -1 ) {
                nodes[i].style.width = width + 'px';
            }
        }
    }
}


/*
	Insert myValue at current cursor position
*/
function insertAtCursor(myField, myValue) {
	// IE support
	if (document.selection) {
		myField.focus();
		sel = document.selection.createRange();
		sel.text = myValue;
	}
	// Mozilla/Netscape support
	else if (myField.selectionStart || myField.selectionStart == '0') {
		var startPos = myField.selectionStart;
		var endPos = myField.selectionEnd;
		myField.value = myField.value.substring(0, startPos)
			+ myValue + myField.value.substring(endPos, myField.value.length);
	} else {
		myField.value += myValue;
	}
}