Cached Javascript .js Files Parsed
May 30, 2007
Lets say you have a 1000 line javascript file which is linked to an everyday html file. The browser is set, by default, cache the linked javascript file (after downloading and interpreting it).
But once it's cached and put into a temp directory on the client's computer, is the cached file in an already parsed format? Or something relative? Or is it in the same format as it was on the server-side? This would mean that the .js file is parsed each time the exact same way (as long as the file itself is not changed, deleted, or renewed on the server-side).
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Jul 20, 2005
I have two .js files that are used on several of my pages. I made some
changes in one of the files. When I call the pages, the old functions
are called because of the browser's cache. What is the best way to
update the browser's cache with the newer version of my .js file?
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Feb 15, 2011
I'm trying to grab a variable from a URL and dynamically embed it into HTML code. So for instance, if I own the site test.com and I enterideo=bunny.mp4&height=720&width=480",I want the returned page to be an embedded video of bunny.mp4 at the height and width specified. I know the embed code, I just need to know how to parse the URL and write it inside of the HTML.
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Apr 21, 2010
The scenario would be something like checking if an element fulfills some complex conditions, something like if(myElement.is('div.someClass[someAttribute], td.someOtherClass[someAttribute]')) ... . Is there a way to parse that string only once, maybe create some sort of "compiled" version of the check, cache it, then give it to is ? Or does jQuery cache the string after parsing it once so I don't have to do anything?
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Sep 19, 2003
on a clients site, i am gettign one file that seems to be cached by aol, and i can not seem to get aol to get the new file. he dials into aol strait, and there is no company sever to worry about. so the client sees the old file and gets on my case. just wondering, is there a way to maybe put something in the file header, to make aol get the new file? it has been about 4 days. all the other files that were changed worked out okay just one is not working. i have checked the browser and tried to clear the cache in ie, and still no luck. the client dials in, so there is no company server to worry about...
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Jan 3, 2007
I have a custom object named #cdata-section, however I am unable to
access this object and get a run time "Illegal Character" javascript
error. my object looks like this:
data.news.story[i].body.#cdata-section
The pound sign is causing problems. How can I use this object in my
javascript source? Right now I'm trying something like this to escape
the pound sign:
summaryNode.appendChild(document.createTextNode(da ta.news.story[i].body.u0023cdata-section));
however, that doesn't work, any ideas?
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Dec 6, 2002
Well, this is acutally a couple different scripts. First is the custom date object myDate which retrieves pretty much every value that you'd need from a date and sets it as a property. If no argument is supplied, the current time and date is used. If you do supply an argument, you can send an existing javascript Date object, or a string that is compatible with declaring a normal javascript Date object.
The 2nd part of this script is the method getDate (and some accompanying String methods) that allow you to retrieve the date as a string by passing it a format string just like the PHP date() (http://www.php.net/manual/en/function.date.php) function accepts. The code posted below includes sufficient (I think) examples to help you understand what is going on. You will notice that I didn't duplicate EVERY code over from PHP, and a few are slightly different. Those that I left out I felt weren't very necessary, or I didn't feel like doing the algorithm for them :D.
Both myDateObj.getDate() and PHP's date() allow you to include text into the string that you don't want parsed, but each handles it differently. In PHP, you need to escape characters normally with a backslash. For getDate you need to proceed each character with a pipe "|". So, instead of$dateStr = date("Day z");as it would be in PHP, you would usevar d = new myDate();
var dateStr = d.getDate("D|a|y| z");There are more examples of how this works below.
Note: There is also a nice arrayReplace() method for strings that is handy for doing multiple replace() operations all at once, so I guess this is really like 3 handy scripts ;)
<html>
<head>
<title>test</title>
<meta http-equiv="expires" content="0">
<script type="text/javascript">
/*** First Part of Script, the custom date object ***/
function myDate(dateStr) {
if (typeof dateStr != 'undefined') {
var d = new Date(dateStr);
this.dateString = dateStr;
}
else if (typeof dateStr == 'object')
var d = dateStr;
else
var d = new Date();
var months = ['January','February','March','April','May','June','July','August','September','October','November',' December'];
var weekDays = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
var monthDays = [31,28,31,30,31,30,31,31,30,31,30,31];
this.epoch = d.getTime();
this.epochS = Math.round(this.epoch / 1000);
this.year4 = d.getFullYear();
this.year2 = parseInt(this.year4.toString().substring(2));
this.leap = (this.year4 % 400 == 0) ? true : (this.year4 % 4 == 0 && this.year4 % 100 != 0) ? true : false;
if (this.leap) monthDays[1]++;
this.mnth = d.getMonth();
this.month = this.mnth + 1;
this.month_2 = leadingZero(this.month);
this.monthName = months[this.mnth];
this.monthNameShort = this.monthName.substring(0,3);
this.days = monthDays[this.mnth];
this.dy = d.getDay();
this.day = this.dy + 1;
this.dayName = weekDays[this.dy];
this.dayNameShort = this.dayName.substring(0,3);
this.date = d.getDate();
this.date_2 = leadingZero(this.date);
this.suffix = (this.date % 10 == 1 ) ? "st" : (this.date % 10 == 2) ? "nd" : (this.date % 10 == 3) ? "rd" : "th";
this.hours24 = d.getHours();
this.hours24_2 = leadingZero(this.hours24)
this.hours12 = (this.hours24 == 0) ? 12 : (this.hours24 > 12) ? this.hours24-12 : this.hours24;
this.hours12_2 = leadingZero(this.hours12);
this.minutes = d.getMinutes();
this.minutes_2 = leadingZero(this.minutes);
this.seconds = d.getSeconds();
this.seconds_2 = leadingZero(this.seconds);
this.millis = d.getMilliseconds();
this.ampm = (this.hours24 == 0) ? "am" : (this.hours24 >= 12) ? "pm" : "am";
this.GMTstring = d.toGMTString();
this.offset = d.getTimezoneOffset();
function leadingZero(num) {
return (num < 10) ? "0" + num : num.toString();
}
}
myDate.prototype.getDayOfYear = function() {
var total = 0;
var monthDays = [31,28,31,30,31,30,31,31,30,31,30,31];
if (this.leap) monthDays[1]++;
for (var i=0; i<this.mnth; total += monthDays[i++]) {}
total += this.date;
return total;
}
/*** Second part of script, the PHP-like parsed output ***/
myDate.prototype.getDate = function(str) {
var p = ['a','A','B','d','D','F','g','G','h','H','i','I','j','l','L','m','M','n','O','r','s','S','t','T','U', 'w','W','Y','y','z','Z'];
var r = new Array();
var i = 0;
var delChar = "|";
var sNull = "null".delimit(delChar)
r[i++] = this.ampm.delimit(delChar);
r[i++] = this.ampm.toUpperCase().delimit(delChar);
r[i++] = sNull;
r[i++] = this.date_2;
r[i++] = this.dayNameShort.delimit(delChar);
r[i++] = this.monthName.delimit(delChar);
r[i++] = this.hours12;
r[i++] = this.hours24;
r[i++] = this.hours12_2;
r[i++] = this.hours24_2;
r[i++] = this.minutes_2;
r[i++] = sNull;
r[i++] = this.date;
r[i++] = this.dayName.delimit(delChar);
r[i++] = (this.leap)?1:0;
r[i++] = this.month_2;
r[i++] = this.monthNameShort.delimit(delChar);
r[i++] = this.month;
r[i++] = this.offset;
r[i++] = this.GMTstring.delimit(delChar);
r[i++] = this.seconds_2;
r[i++] = this.suffix.delimit(delChar);
r[i++] = this.days;
r[i++] = sNull;
r[i++] = this.epochS;
r[i++] = this.dy;
r[i++] = sNull;
r[i++] = this.year4;
r[i++] = this.year2;
r[i++] = this.getDayOfYear();
r[i++] = sNull;
for (i=0; i<p.length; i++)
p[i] = "/" + p[i] + "(?!|)/g";
return str.arrayReplace(p, r).replace(/|/g,"");
}
String.prototype.arrayReplace = function(arrP, arrR) {
var p, s = this;
for (var i=0; i<arrP.length; i++) {
var flags = arrP[i].substring(arrP[i].lastIndexOf("/")+1);
var regex = arrP[i].substring(1,arrP[i].lastIndexOf("/"));
p = new RegExp(regex, flags);
s = s.replace(p, arrR[i]);
}
return s;
}
String.prototype.delimit = function(char) {
var s = "";
for (var i=0; i<this.length; i++) {
s += this.charAt(i) + char;
}
return s;
}
</script>
</head>
<body>
<script type="text/javascript">
/*** Example using current date/time ***/
var md1 = new myDate();
document.write(md1.getDate("l jS of F Y h:i:s A")+"<br>");
document.write(md1.getDate("T|o|d|a|y| i|s| m.d.y")+"<br>");
document.write(md1.getDate("D M j G:i:s Y")+"<br>");
document.write("It " + (md1.leap?"is":"is not") + " a leap year<br>");
document.write("The unix epoch occurred " + md1.epochS + " seconds ago");
document.write("<hr>");
/*** Example using javascript Date object as argument ***/
var d1 = new Date(2000, 01, 02, 15, 15, 15);
var md2 = new myDate(d1);
document.write(md2.getDate("l jS of F Y h:i:s A")+"<br>");
document.write(md2.getDate("T|o|d|a|y| i|s| m.d.y")+"<br>");
document.write(md2.getDate("D M j G:i:s Y")+"<br>");
document.write("It " + (md2.leap?"is":"is not") + " a leap year<br>");
document.write("The unix epoch occurred " + md2.epochS + " seconds ago");
document.write("<hr>");
/*** Example using Date object compatible string as argument ***/
var md3 = new myDate("December 10, 1978 12:23:00");
document.write(md3.getDate("l jS of F Y h:i:s A")+"<br>");
document.write(md3.getDate("T|o|d|a|y| i|s| m.d.y")+"<br>");
document.write(md3.getDate("D M j G:i:s Y")+"<br>");
document.write("It " + (md3.leap?"is":"is not") + " a leap year<br>");
document.write("The unix epoch occurred " + md3.epochS + " seconds ago");
</script>
</body>
</html>
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Apr 14, 2006
I have been struggling with a cross browser solution to loading
external javascript files on the fly.
I have been successful using the following code in IE6:
var newScr = document.createElement("SCRIPT");
newScr.src = "newScr.js";
newScr.type="text/javascript";
document.getElementsByTagName("head")[0].appendChild(newScr);
I believe the reason is that IE is loading the external file
syncronously while Firefox is not. Is there an onload event for
creating an element (if so I do not see it in Venkman). I have seen the
solution of using XMLHTTP to load the script but I am trying to get
around any dependency (atleast at this stage of the library) on
activex.
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Aug 21, 2006
1. I create an HTML document that validates at w3c
2. I use:
<script language="JavaScript" type="text/javascript"
src="dashboard.js" ></script>
3. <body onload="something_in_dashboard_js()">
4. In Firefox, it works beautifully ( no shock )
5. In IE it does not ( no shock )
6. If i put the function in inline <scripttags in my HTML, the JS
runs fine (no syntax error).
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Oct 15, 2007
I need a way of loading api scripts on the fly. ie. if the user clicks on a link the javascript would suck in the api script depending on what the user has selected. By api script I mean:
<script src="http://api.maptp.map24.com/ajax?appkey=blahblahblahthisisakey" type="text/javascript"></script>
I am using the maps24 api to build an address finder - ie. put your postcode/zipcode in and populate the rest of the address details. For some reason you need to load a different js file for each region (north america, europe, etc). I want my users to click on their region and have the <script> tags inserted into the head. I have done this using javascript but the functions don't seem to be available. I am assuming that the page needs to refresh??
Does anyone know away of making the javascript functions available to use without having to refresh the page? In other words, loading javascript files on the fly.
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Sep 14, 2010
I've been using JavaScript for a few years now I'm not a huge expert I rely more of JQuery. I am just wondering what best solutions are there to call Javascript files (and to make pages load faster):
Normally I request all these in the Header like you normally would but I have seen and heard people to call their Javascript files in the footer to make page load faster and have all their Javascript functions all in the footer as well.
Is this a good idea? What are the downside? Should I just keep all my JS in the Header as usual?
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Jan 6, 2006
I have Declared same function and two diff javascript files and both files are included in HTML page and one more same function declared in HTML code too... So problem is that, which function will execute first, i mean function in either javascript or function in HTML Code?
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Jul 20, 2005
I have a problem of client side XSL transformation. I sent the XML and the XSL to the client in XML data islands. Using the transform Node method the HTML is returned. There
is however some script tag in the XSL file which references external
..js files they are like
<SCRIPT language="Javascript" src="abc.js" DEFER="true" />
Now, after transformation the function from this .js file are not
called and object required errors are thrown. This is despite the fact
that IE has downloaded the .js file and they are visisble in the cache
(Temporary Internet Files). This problem only occurs if the .js file
is not present in the cache, hence it happens when the user visits
some site for the first time.
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Oct 2, 2010
I have the following JavaScript (see below). The script requests an XML file from the server and displays it on the page.The script works fine when the requested XML file is stored on the same server as the script.The problem is when I try requesting an XML file from an external server such as the National Weather Service. I get an error. If I take the XML file from the National Weather Service and save it to my server it works. Why can't I use my script to request XML files stored on external servers?
Javascript Code
Code:
window.onload = initAll;
var xhr = false;
function initAll() {
document.getElementById("makeTextRequest").onclick = getNewFile;
[code]....
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Jan 15, 2010
I have four folders and each folder has one images, let say ( images-one.jpg, images-two.jpg, images-three.jpg, images-four.jpg). now,in index.php page there are four buttons, each buttons for each images. if i clicked button numer two for images-two.jpg, and then it will show that images name from that folder in index.php page. and then if i reload same index.php page or refreshed same page, i want to show SAME images that I clicked before which is images-two.jpg. how can i write that code to show images from four files, each files are in each folder.
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Jul 20, 2005
I have an html page that uses javascript to open a new window and
display a file that gets created when a button is pressed.
My problem is when the file is changed and the display button is
pressed, the old file is still displaying. I have tried using
<META HTTP-EQUIV=expires CONTENT=0><META HTTP-EQUIV=PRAGMA CONTENT=NO-CACHE>, but doesn't work 100% of the time.
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