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JavaScript - Determine Whether Two Time Ranges Overlap
When it occurred to me that I needed to calculate this, I knew it was over my head. (although I did come up with what I thought to be a pretty clever solution involving a very complex series of arrays...) So I decided to google it. The trouble is, the solution was a little over my head too...
Sooo I hacked away at it for about an hour, and finally it worked, but on closer inspection I had made a typo from the original algorithm. So I thought I would pose the question to you all... Is the original algorithm correct, or flawed? is my interpretation correct/flawed, or the same? I'm not really sure what I did here, but after many tests, I think I got the correct solution. original post on http://stackoverflow.com/questions/3...ranges-overlap Quote: Let CondA Mean DateRange A Completely After DateRange B (True if StartA > EndB) Let CondB Mean DateRange A Completely Before DateRange B (True if EndA < StartB) Then Overlap exists if Neither A Nor B is true ( If one range is neither completely after the other, nor completely before the other, then they must overlap) Now deMorgan's law, I think it is, says that Not (A Or B) <=> Not A And Not B Which means (StartA <= EndB) And (EndA >= StartB) NOTE: This includes conditions where the edges overlap exactly. If you wish to exclude that, change the >= operators to >, and <= to < And finally the test scenario that I finally got to work: Code: <input onclick="this.value=''" onkeyup="TEST()" id=inhour1 value=1>
<input onclick="this.value=''" onkeyup="TEST()" id=inminute1 value=1>
<br />
<input onclick="this.value=''" onkeyup="TEST()" id=outhour1 value=2>
<input onclick="this.value=''" onkeyup="TEST()" id=outminute1 value=1>
<br />
<br />
<input onclick="this.value=''" onkeyup="TEST()" id=inhour2 value=3>
<input onclick="this.value=''" onkeyup="TEST()" id=inminute2 value=1>
<br />
<input onclick="this.value=''" onkeyup="TEST()" id=outhour2 value=4>
<input onclick="this.value=''" onkeyup="TEST()" id=outminute2 value=1>
<script>
function ID(e){return document.getElementById(e)}
function TEST(){
intime1=(parseInt(ID('inhour1').value,10)*60*60)+(parseInt(ID('inminute1').value,10)*60)
intime2=(parseInt(ID('inhour2').value,10)*60*60)+(parseInt(ID('inminute2').value,10)*60)
outtime1=(parseInt(ID('outhour1').value,10)*60*60)+(parseInt(ID('outminute1').value,10)*60)
outtime2=(parseInt(ID('outhour2').value,10)*60*60)+(parseInt(ID('outminute2').value,10)*60)
comp= (intime1 <= outtime2)&&(outtime1 <= intime2)
ID('compare').innerHTML=''
ID('compare').innerHTML+=intime1+'<br />'
ID('compare').innerHTML+=outtime1+'<br />'
ID('compare').innerHTML+=intime2+'<br />'
ID('compare').innerHTML+=outtime2+'<br />'
ID('compare').innerHTML+=comp+'<br />'
}
</script>
<button onclick="TEST()">compare</button>
<div id="compare"></div>
Any feedback would help a lot! I fear using an algorithm that I don't fully understand in production code... Similar TutorialsHello! I do my calendar (vertical) =) and I've done to date were down But how to do that day of the week displayed on the side of the date of Here is code: Code: <html><head><title>Calendar</title>
<meta http-equiv="content-type" content="text/html; charset=windows-1251" />
</head>
<body><center>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
monthnames = new Array("January","Febrary","March","April","May","June","July","August","September","October","November","December");
var linkcount=0;
function addlink(month, day, href) {
var entry = new Array(3);
entry[0] = month;
entry[1] = day;
entry[2] = href;
this[linkcount++] = entry;
}
Array.prototype.addlink = addlink;
linkdays = new Array();
monthdays = new Array(12);
monthdays[0]=31;
monthdays[1]=28;
monthdays[2]=31;
monthdays[3]=30;
monthdays[4]=31;
monthdays[5]=30;
monthdays[6]=31;
monthdays[7]=31;
monthdays[8]=30;
monthdays[9]=31;
monthdays[10]=30;
monthdays[11]=31;
todayDate=new Date();
thisday=todayDate.getDay();
thismonth=todayDate.getMonth();
thisdate=todayDate.getDate();
thisyear=todayDate.getYear();
thisyear = thisyear % 100;
thisyear = ((thisyear < 50) ? (2000 + thisyear) : (1900 + thisyear));
if (((thisyear % 4 == 0)
&& !(thisyear % 100 == 0))
||(thisyear % 400 == 0)) monthdays[1]++;
startspaces=thisdate;
while (startspaces > 7) startspaces-=7;
startspaces = thisday - startspaces + 1;
if (startspaces < 0) startspaces+=7;
document.write
for (s=0;s<startspaces;s++) {
document.write();
}
count=1;
while (count <= monthdays[thismonth]) {
for (b = startspaces;b<7;b++) {
linktrue=false;
/////displays the date
document.write("<br width='30'>");
if (count <= 31) {
document.write(monthnames[thismonth]);
document.write(" ");
}
for (c=0;c<linkdays.length;c++) {
if (linkdays[c] != null) {
if ((linkdays[c][0]==thismonth + 1) && (linkdays[c][1]==count)) {
document.write("<a href=\"" + linkdays[c][2] + "\">");
linktrue=true;
}
}
}
if (count==thisdate) {
document.write("<font color='FF0000'><strong>");
}
if (count <= monthdays[thismonth]) {
document.write(count);
}
else {
document.write(" ");
}
if (count==thisdate) {
document.write("</strong></font>");
}
if (linktrue)
document.write("</a>");
document.write;
count++;
}
document.write;
document.write("<tr>");
startspaces=0;
}
document.write("</p>");
// End -->
</SCRIPT>
</center></body>
</html>
THIS IS NOT HOMEWORK Hi all, See this image: The image represents an "entire" web page and the bright part the area currently scrolled into by the web browser. I can get the client's screen SIZE, but I don't know how to figure how many pixels down into a page the browser happens to be. To clarify, the distance shown as a question mark would be "zero" if the browser were scrolled all the way to the top of the page and some positive number as the browser scrolls down. Is there any way for me to get this number (in Javascript). What I need it for is to position a pop-up window centered left-to-right and 1/3-2/3 top to bottom on the screen REGARDLESS of where in the page the browser is scrolled. Thanks..... -- Roger Referring to following link, I would like to determine the link for "In-Depth.xls", based on following coding, I find related information for Excel.png, does anyone have any suggestions on how to determine the URL for Excel file? Thanks in advance for any suggestions http://fx.aastocks.com/en/forex/mark...0&indicator=47 <img src="../../images/common/Excel.png" id="cp_imgExcel" class="btn" onclick="window.location.href='dbindepth.aspx?country=66970&startdate=2010/12/24&enddate=2011/12/24&indicator=47&excel=1'"/> HI all. How do I determine whether a variable exists in a form. I have a form called "theForm". I want to determine whether the variable "THIRD_PARTY" exists in the form and if it has been set. Tracy Hi, I have a click event that changes an element from a span that acts like a text link, to a textbox that the user types in: Code: Event.add(area_el_rename, 'click', function(e)
{
if(!currently_renaming)
{
area_el.innerHTML = '<textarea name=\"renaming_area\" id=\"renaming_area\" style=\"width:100px;height:10px;background-color:#DCDCDC; resize:none;font-size:8px;\"></textarea><br>';
currently_renaming=true;
}
});
I am wondering if there is any way to determine if the user has clicked outside the textbox, and if so, perform an action (in my case revert back to the <span>. The solution probably doesn't need to be tied to anything. It probably just has to be something like: if(click_outside_id("renaming_area")) { //do my desired action } greetings, I'm unable to find solution for dreamweaver reporting syntax error with the following page: http://www.redskyjewelry.com/test_product_detail.html I am revamping my website so the css is not set up for this page but that's okay. I have put in the various javascripts based on the product so the page is similar to a template. The syntax error is for the second set of boxes, the bracelet length options, and specifically for line with: form.amount.value = 6.5 inches; from the following script-- <SCRIPT language=javascript> function BraceletLength(form) { if (form.os0.value == "6.5 inches") { form.amount.value = 6.5 inches; form.item_number.value = "6.5 inches"; } if (form.os0.value == "7 inches") { form.amount.value = 7 inches; form.item_number.value = "7 inches"; } if (form.os0.value == "7.5 inches") { form.amount.value = 7.5 inches; form.item_number.value = "7.5 inches"; } if (form.os0.value == "8 inches") { form.amount.value = 8 inches; form.item_number.value = "8 inches"; } } </SCRIPT> I hope I have included enough information and I thank any input into this glitch I am having. I'll check back tomorrow, and thank you. judith I have an array of all links on a page (see var wa_links = document.links; below). How do I determine if the target of a link is set to "_blank"? I need to do this because currently with my code below, when a link has target="_blank" it ends up adding the Google Analytics code to the parent window and also opening a new window (so basically the new page opens in both the parent and target window instead of just the target window as expected). Code: /*Regex list of on-site domains, pipe and backslash delimited. */
var wa_onsiteDomains = /mydomain\.com|my2nddomain\.com|my3rddomain\.com|javascript/i;
//Display-friendly domain and path name
var wa_displayDomain = location.hostname.replace("www.","").toLowerCase();
var wa_displayPathname = location.pathname.toLowerCase();
/*Used to unobtrusivly add events to objects*/
function unobtrusiveAddEvent (element,event,fn) {
var old = (element[event]) ? element[event] : function () {};
element[event] = function () {fn(); old();};
}
function wa_crossDomainLink(i) {
return function () {
var thisLink = decodeURI(wa_links[i]);
if (typeof(_gaq) == "object")
_gaq.push(['_link', thisLink]); return false;
};
}
var wa_links = document.links;
if ( wa_links ){
for(var i=0; i<wa_links.length; i++) {
if( wa_links[i].href.match(wa_onsiteDomains) && !wa_links[i].href.match(location.hostname)){
unobtrusiveAddEvent( wa_links[i], 'onclick' , wa_crossDomainLink(i));
}
}
}
With jquery I could just do something like... Code: if (jQuery(link).attr('target') == "_blank")
...but how do I do this in plain old JavaScript? Thanks! Hi everyone, Is it possible to determine at the startup of the page if the visitor is using a computer or a phone to access the site? I would like to make the intro process much better than a simple "click here for HTML version or click here for Flash version". I would like for it to simply redirect to the page I set it to go to depending on whether or not they're using a regular browser or a mobile browser. How would I go about this? Thank you all very much in advance. I need the code for if the user enters in a code into the field for example E1 and clicks submit it'll redirect them to a certain form. And if another user entered in E2 it would redirect them to a DIFFERENT form. I hope this is the correct category of the site for me to post this. Wasn't sure if it should be here or PHP.
I have a floating div that stays at the bottom of the browser window while the user scrolls down a long page. The div reads "scroll down for more". How can I determine the current position of the div in relation to the top of the page, not the top of the browser window. I need to determine this because I would like to hide the div when the user scrolls to the top of the last page. I have looked at offsetParent, offsetHeight, scrollHeight, etc. I have the code for everything except determining the position of the div, or the distance of the div from the top of the page. I have a string of text, and starting from a particular spot (known to be a number), I want to find the length of that number. Here's what I have: Code: ...
var start = [...predetermined...]
var end = 0;
while (!isNaN(sourceCode.charAt(start + end))){
endCurrent++;
}
var myNum = sourceCode.substr(start, end) * 1;
So let's say var sourceCode = "alkdjabjasdsdf-53 dnalsdb..."; , startCurrent will already be at the "5" and I want to be able to extract the "53". What I have works, but it seems cumbersome... Any advice? I use the tutorial from http://www.javascriptkit.com/script/...geviewer.shtml and create an overlap image viewer. But whenever I use Firefox or IE to open my webpage, the overlap image viewer is not shown on the website. In other words, only the image link hint is shown when my mouse is over the image. I know when i open the page with java scripts, IE or Firefox will usually has a warning and ask the user if you want to run scripts or ActiveX. But the page with overlap image viewer I created will not invoke any pop-up blocker warnings and at least let a user have an option to see my overlap image. what should i add to make the overlap image viewer show in a proper way after opening IE or Firefox? I am allowing my customers to use a rich text editor (wysiwyg) on a jsp page to create snippets of HTML code that can be used to describe their items. When they want to add an image, table or custom tag (something we wrote), they are presented with a properties box created using javascript on the same page just below the editor. Upon clicking 'Insert' button on the properties box, I use javascript to create an HTML string with the tag information and insert the string into the edited page where the cursor was. The problem is that I can't seem to find a reliable way to know where the cursor was. More information: I am a C programmer who morphed to a Java programmer who knows some javascript. The JSP page looks like this: -------------------------------------------------------------------- Some text and text fields for some basic information -------------------------------------------------------------------- The javascript wysiwyg editor -------------------------------------------------------------------- The properties box (changes depending on the type of item being inserted) -------------------------------------------------------------------- Submit button, etc. for the page (so the information can be persisted) I have tried: 1. Seven days of searching the web for helpful hints. 2. Using a popup window to get the properties (doesn't work because in IE7, closing the popup also kills the session... I need to use some of the beans on the main window on the popup.) 3. Processing onMouseDown and onKeyDown events storing the element information in a global variable so I could use it later to know the point of insertion. (Has not been reliable and the arrow keys present real problems with where the cursor ends up as that is different from where it was pressed.) I am frustrated because I don't seem to be gaining on the problem. I suspect it is because I have missed something very simple. Does anyone have any ideas? Thanks in advance. Carl hi guys. im new to javascript and i require some help on a task so hoping someone on here could help me and possibly push me in the right direction. so i have a website with content on specific pages i need some sort of JS soloution which will fetch an ID/Keyword out of the page content so when a button is clicked it finds the ID/keyword and directs the user to a specific form/page. is this possible and can any1 help? Cheers, Ant. Hi Code: var err_str="";
function validate_grid(value,id,ind)
{
$("#result").html(" ").show();
if(ind==1 || ind==2)
{
var patt=/^([0][0-9]|[1][0-9]|[2][0-3])[:]{1}[0-5][0-9]$/;
if(!patt.test(value))
{
mygrid.setCellTextStyle(id,ind,"background-color:yellow;");
if(err_str!="")
err_str+="\n"+(ind+1)+".Enter numbers and : only..";
else
err_str=(ind+1)+".Enter numbers and : only";
return false;
}
else
{
mygrid.setCellTextStyle(id,ind,"background-color:white;");
return true;
}
}
}
alert(err-str);
here ind==1 is from_time and ind==2 is to_time,i need to validate time as to_time must be always greater than from-time,if condition fails an alert msg should populate.time format is[05:00]as it is in string format im unable to do the validation for it.(ex:from-time=08:00 to-time=07:59 condition fails) thank you. Hello im using dhtmlx grid in this cells i have from time and to time (i.e ind==1 and ind==2) i need to validate time where to-time must be greater than from-time else it should alert an message,i have writeen a normal Regular expression for the time validation.as the time is i string format i.e[05:00],please can any one send me code for that. Code: var err_str="";
function validate_grid(value,id,ind)
{
if(ind==1 || ind==2)
{
var patt=/^([0][0-9]|[1][0-9]|[2][0-3])[:]{1}[0-5][0-9]$/;
if(!patt.test(value))
{
mygrid.setCellTextStyle(id,ind,"background-color:yellow;");
if(err_str!="")
err_str+="\n"+(ind+1)+".Enter numbers and : only..";
else
err_str=(ind+1)+".Enter numbers and : only";
return false;
}
else
{
mygrid.setCellTextStyle(id,ind,"background-color:white;");
return true;
}
}
}
hi im using dhtml xgrid where i need to do validation for time ,(from-time and to-time i.e ind==1 and ind==2 ) to-time must be greater than from-time else i need to alert a message to-time must be greater than from-time. can any one send me the code for it time format is[05:00]. Code: var err_str="";
function validate_grid(value,id,ind)
{
$("#result").html(" ").show();
if(ind==1 || ind==2)
{
var patt=/^([0][0-9]|[1][0-9]|[2][0-3])[:]{1}[0-5][0-9]$/;
if(!patt.test(value))
{
mygrid.setCellTextStyle(id,ind,"background-color:yellow;");
if(err_str!="")
err_str+="\n"+(ind+1)+".Enter numbers and : only..";
else
err_str=(ind+1)+".Enter numbers and : only";
return false;
}
else
{
mygrid.setCellTextStyle(id,ind,"background-color:white;");
return true;
}
}
}
1 down vote favorite I do have the countdown script (see link below) to display the time between current time and the date given in real-time. However, I want to achieve to display the time difference between a given start and end time. Right now, it calculates from the current server time to the end time. I want to be able to set up my own start time and end time. Here is what I have: http://jsfiddle.net/BgEtE/ thank you for help hi, can some one help me how to get the time and date difference? given two time and date with the following format like in textbox A: 2011-05-03 17:35:47.0 and textbox B: 2011-05-03 16:35:47.0 then the output would be: 0 days, 1 hour, 0 minutes, 0 seconds regards, verve |
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