Sorry for the long question.
I have tried to create a meetings on a calendar for a day. I need help to take care of the overlapping intervals.
The code I have written in following :
HTML
<body>
<div id="timeline"></div>
<div id="calendar" class="calendar">
</div>
</body>
CSS
.calendar {
border: 1px solid black;
position: absolute;
width: 600px;
height: 1440px;
left: 60px;
}
.event {
position: absolute;
float: left;
width: 100%;
overflow: auto;
border: 0px solid red;
}
#timeline {
position: absolute;
float: left;
}
JS
function getRandomColor() {
var letters = '0123456789ABCDEF'.split('');
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
function creatTimeline(tl) {
var i = 0;
while (i < tl.length) {
var divEl = document.createElement('div');
divEl.style.width = '50px';
divEl.style.height = '120px';
divEl.style.border = '0px solid yellow';
divEl.innerHTML = tl[i];
var timeLine = document.getElementById('timeline');
timeLine.appendChild(divEl);
i++;
}
}
function appendEventDivs(eventArr) {
var i = 0;
while (i < eventArr.length) {
var eventEl = document.createElement('div');
eventEl.className = 'event';
eventEl.style.height = eventArr[i].height;
eventEl.style.top = eventArr[i].top;
eventEl.style.background = eventArr[i].color;
eventEl.style.width = eventArr[i].width;
eventEl.style.left = eventArr[i].left;
eventEl.innerHTML = 'Meeting' + eventArr[i].id;
var cl = document.getElementById('calendar');
cl.appendChild(eventEl);
i++;
}
}
function collidesWith(a, b) {
return a.end > b.start && a.start < b.end;
}
function checkCollision(eventArr) {
for (var i = 0; i < eventArr.length; i++) {
eventArr[i].cols = [];
for (var j = 0; j < eventArr.length; j++) {
if (collidesWith(eventArr[i], eventArr[j])) {
eventArr[i].cols.push(i);
}
}
}
return eventArr;
}
function updateEvents(eventArr) {
eventArr = checkCollision(eventArr);
var arr = [];
arr = eventArr.map(function(el) {
//just to differentiate each event with different colours
el.color = getRandomColor();
el.height = (el.end - el.start) * 2 + 'px';
el.top = (el.start) * 2 + 'px';
el.width = (600 / el.cols.length) + 'px';
return el;
});
return arr;
}
var events = [{
id: 123,
start: 60,
end: 150
}, {
id: 124,
start: 540,
end: 570
}, {
id: 125,
start: 555,
end: 600
}, {
id: 126,
start: 585,
end: 660
}];
var timeline = ['9AM', '10AM', '11AM', '12Noon', '1PM', '2PM', '3PM', '4PM', '5PM', '6PM', '7PM', '8PM', '9PM'];
function getEvents (eventArr) {
eventArr.sort(function(a, b) {
return a.start - b.start;
});
eventArr = updateEvents(eventArr);
appendEventDivs(eventArr);
console.log(eventArr);
//PART 1 - function returning the eventArr with all the required attributes
return eventArr;
};
creatTimeline(timeline);
getEvents(events);
Working fiddle here
Can anybody guide me how to take care of the overlapping intervals so that they appear side-by-side and not on top of each other.
Thanks in advance.
You need to figure out in which column each of the events should be before you can determine their width or left-position. To do this, you need to also store which of the colliding events came before each event:
function checkCollision(eventArr) {
for (var i = 0; i < eventArr.length; i++) {
eventArr[i].cols = [];
eventArr[i].colsBefore=[];
for (var j = 0; j < eventArr.length; j++) {
if (collidesWith(eventArr[i], eventArr[j])) {
eventArr[i].cols.push(j);
if(i>j) eventArr[i].colsBefore.push(j); //also list which of the conflicts came before
}
}
}
return eventArr;
}
Now, we can figure out the column of each event. Once we've done that, we can figure out how wide they should be, and with that, the horizontal positioning should be easy. This should be done inside your updateEvents function. I've got more detailed explanation commented in the comments of the code below.
function updateEvents(eventArr) {
eventArr = checkCollision(eventArr);
var arr=eventArr.slice(0); //clone the array
for(var i=0; i<arr.length; i++){
var el=arr[i];
el.color = getRandomColor();
el.height = (el.end - el.start) * 2 + 'px';
el.top = (el.start) * 2 + 'px';
if(i>0 && el.colsBefore.length>0){ //check column if not the first event and the event has collisions with prior events
if(arr[i-1].column>0){ //if previous event wasn't in the first column, there may be space to the left of it
for(var j=0;j<arr[i-1].column;j++){ //look through all the columns to the left of the previous event
if(el.colsBefore.indexOf(i-(j+2))===-1){ //the current event doesn't collide with the event being checked...
el.column=arr[i-(j+2)].column; //...and can be put in the same column as it
}
}
if(typeof el.column==='undefined') el.column=arr[i-1].column+1; //if there wasn't any free space, but it ito the right of the previous event
}else{
var column=0;
for(var j=0;j<el.colsBefore.length;j++){ //go through each column to see where's space...
if(arr[el.colsBefore[el.colsBefore.length-1-j]].column==column) column++;
}
el.column=column;
}
}else el.column=0;
}
//We need the column for every event before we can determine the appropriate width and left-position, so this is in a different for-loop:
for(var i=0; i<arr.length; i++){
arr[i].totalColumns=0;
if(arr[i].cols.length>1){ //if event collides
var conflictGroup=[]; //store here each column in the current event group
var conflictingColumns=[]; //and here the column of each of the events in the group
addConflictsToGroup(arr[i]);
function addConflictsToGroup(a){
for(k=0;k<a.cols.length;k++){
if(conflictGroup.indexOf(a.cols[k])===-1){ //don't add same event twice to avoid infinite loop
conflictGroup.push(a.cols[k]);
conflictingColumns.push(arr[a.cols[k]].column);
addConflictsToGroup(arr[a.cols[k]]); //check also the events this event conflicts with
}
}
}
arr[i].totalColumns=Math.max.apply(null, conflictingColumns); //set the greatest value as number of columns
}
arr[i].width=(600/(arr[i].totalColumns+1))+'px';
arr[i].left=(600/(arr[i].totalColumns+1)*arr[i].column)+'px';
}
return arr;
}
Working Fiddle: https://jsfiddle.net/ilpo/ftbjan06/5/ I added a few other events to test different scenarios.
Oh, and by the way, absolutely positioned elements can't float.