This is a long-shot and I'm writing because I have not idea where to start.
I want to write some code that can automatically and on regular basis grab the 5 dates from this website and put them into my iCal calender.
Where should I start and end to do this?
I'm pretty good in RoR and Javascript, but have absolutely no idea what technology I should use to accomplish this.
Hope you can shed some light on my question.
Thanks
Assuming the HTML page is always going to keep the same basic structure, you could use something like nokogiri to locate the nodes containing the dates.
You can then use the Date.strptime or DateTime.strptime methods to convert the date from the particular format, into a Date or DateTime object, as required.
As for then adding the dates to your calendar, it's not something I have had to do, but you might want to check out How to interact with a CalDAV server from Ruby?
Use an XMLHttpRequest object in Javascript to download the page that you need and then use a regular expression to parse out the dates. It seems that the dates all have a fixed format:
<b>Mon Day Hr:Min UTC+4</b>
so it should be easy to write the regular expression for this. I don't know the exact Javascript Regex format but here's the .NET equivalent, it should be easy to tweak this to Javascript - hope this helps:
<b>(?<date>(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) [0-9]{2} [0-9]{2}:[0-9]{2}) UTC[+-][0-9]+</b>
This finds all date fields in the page - once you have the date fields, each Regex match will have a sub-group named date that contains the actual date part.
If you go to this page: .NET Regex tester you can test the above expression to see how it returns the dates - just copy & paste your page's source with the dates. As I said, this is for .NET, not for Javascript but the differences are not terribly big.
Use a Ruby script. The Mechanize gem can scrape the dates from the web page. Then the ri_cal gem can add them to your calendar. A pure JavaScript approach like xxbbcc suggested may be possible but it will almost certainly be more involved. If you're already familiar with Ruby, I'd recommend taking advantage of the "magic" and let these gems do the dirty work for you.
Related
I am just a newcomer developing an app with html/css/js via phonegap. I've been searching info on how to make my app be displayed in different languages and Google doesn't understand me.
So the idea is to have a button on index.html that let the user choose the language in which the app will be displayed, in this case Spanish/English, nothing strange like arabic blablabla....
So I guess that the solution must be related to transform all the text that I load in html to variables and then depending on the language selected display the correct one. I have no idea how to make this, and Im not able to find examples. So that's what Im asking for... if someone could give some code snipet to see how html variables works and how should I save user language selection...
Appreciated guys!
This can be done by internationalization (such as i18N). To do this you need separate file for each language and put all your text in it. Search Google for internationalization.
Otherwise you can look into embeding Google Translate.
This depends on the complexity of language-dependencies in the application. If you have just a handful of short texts in a strongly graphic application, you can just store the texts in JavaScript variables or, better, in properties of an object, with one object per language.
But if you expect to encounter deeper language-dependencies as well (e.g., displaying dynamically computed decimal numbers, which should be e.g. 1.5 in English and 1,5 in Spanish), then it’s probably better to use a library like Globalize.js (described in some detail in my book Going Global with JavaScript and Globalize.js). That way you could use a unified approach, writing e.g. a string using Globalize.localize('greeting') and a number using Globalize.format(x, 'n1') and a date using Globalize.format(date, 'MMM d').
I'm using a date picker built in to my device and it returns the date in format YYYY/MM/DD
and returns the time in format HH:MM 24 hours.
The overall returned string is YYYY/MM/DDT/HH/MM
T being the separator.
What is the best way to validate this so that it matches the format YYYY/MM/DD/T/HH/MM
Regex ? Does JavaScript have validation for date/time built it even if i have to split at T so i have the date and time in separate variables?
Whats the best way/algorithm to do this aswell preformance wise?
If i split my varible in to array like...
["YYYY/MM/DD","HH:MM"]
Is there a regex or js function that validates this best? Preformance is key.
Thanks
I wouldn't be worried about performance, you're not going to be doing this hundreds of thousands of times in a tight loop, presumably.
A regex is a good way to do it, and will be easy to write; if you create the regex once and reuse it, it should perform well too.
Assuming your example of the format is a typo and you meant YYYY/MM/DDTHH:MM, a modern JavaScript engine should also support using that string as the argument to new Date(...) provided you change the / to - (which you can readily do via String#replace). That's because it fits the pared-down ISO-8601 format defined as part of ES5. But older engines (IE8 and earlier, for instance) may not support it, you'd have to test on the browsers you intend to support. But if it's really YYYY/MM/DDT/HH/MM, ignore this paragraph.
As part of a small project I'm working on, I need to be able to parse a string into a custom object, which represents an action, date and a few other properties. The tricky part is that the input string can come in a variety of flavors that all need to be properly parsed.
Input strings may be in the following formats:
Go to work tomorrow at 9am
Wash my car on Monday, at 3 pm
Call the doctor next Tuesday at 10am
Fill out the rebate form in 3 days at 2:30pm
Wake me up every day at 7:00am
And the output object would look something like this:
{
"Action":"Wash my car",
"DateTime":"2011-12-26 3:00PM", // Format is irrelevant at this point
"Recurring":False,
"RecurranceType":""
}
At first I thought of constructing some sort of tree to represent different states (On, In, Every, etc.) with different outcomes and further states (candidate for a state machine, right?). However, the more I thought about this, the more it started looking like a grammar parsing problem. Due to a (limited) number of ways the sentence could be formed, it looks like some sort of grammar parsing algorithm would need to be implemented.
In addition, I'm doing this on the front end, so JavaScript is the language of choice here. Back end will be written in Python and could be used by calling AJAX methods, if necessary, but I'd prefer to keep it all in JavaScript. (To be honest, I don't think the language is a big issue here).
So, am I in way over my head? I have a strong JavaScript background, but nothing beyond school courses when it comes to language design, parsing, etc. Is there a better way to solve this problem? Any suggestions are greatly appreciated.
I don't know a lot about grammar parsing, but something here might help.
My first thought is that your sentence syntax seems to be pretty consistent
1st 3-4 words are generally VERB text NOUN, followed by some form of time. If the total options are limited to what form the sentence can take, you can hard-code some parsing rules.
I also ran across a couple of js grammar parsers that might get you somewhere:
http://jscc.jmksf.com/
http://pegjs.majda.cz/
http://www.corion.net/perl-dev/Javascript-Grammar.html
This is an interesting problem you have. Please update this with your solutions later.
I am using intalio editor in that I want to convert the Hijri date into a Gregorian date or vice-versa. we write code in javascript using jsx3 so please help me.
For Gregorian->Hijiri, see here
Bidirectional C# version here that could be converted to Javascript
EDIT: An excellent page and convertors can be found here. That page says:
All calculations are done in
JavaScript executed in your own
browser; complete source code is
embedded in or linked to this page,
and you're free to download these
files to your own computer and use
them even when not connected to the
Internet.
which suggests to me you can use the code, but you probably want to check with the page author
It helps to know that muslims refer to the Gregorian calendar as Masihi. Googling for "hijrah to masihi converter" turns up this page as the second hit: http://www.islamicity.com/PrayerTimes/defaultHijriConv.asp
The javascript is code contains two functions GregToIsl and IslToGreg that does what you want.
There is a copyright notice on that page so you shouldn't simply copy-paste the code. But the functions are short enough for you to extract the relevant maths out of.
The maths/algorithm itself is almost a thousand years old so it shouldn't have any legal restriction.
Try dojox.date.islamic
In Javascript the correct way for such conversion is to use Intl object (read more) as following:
a = new Date();
localeFormat= 'ar-SA-islamic-umalqura';
Intl.DateTimeFormat(localeFormat).format(a)
Let's say I have a date that I can represent in a culture-invariant format (ISO 8601).
I'll pick July 6, 2009, 3:54 pm UTC time in Paris, a.k.a. 5:54 pm local time in Paris observing daylight savings.
2009-07-06T15:54:12.000+02:00
OK... is there any hidden gem of markup that will tell the browser to convert that string into a localized version of it?
The closest solution is using Javascript's Date.prototype.toLocaleString(). It certainly does a good job, but it can be slow to iterate over a lot of dates, and it relies on Javascript.
Is there any HTML, CSS, XSLT, or otherwise semantic markup that a browser will recognize and automatically render the correct localized string?
Edit:
The method I am currently using is replacing the text of an HTML element with a localized string:
Starting with:
<span class="date">2009/07/06 15:54:12 GMT</span>
Using Javascript (with jQuery):
var dates = $("span.date", context);
// use for loop instead of .each() for speed
for(var i=0,len=dates.length; i < len; i++) {
// parse the date
var d = new Date(dates.eq(i).text());
// set the text to the localized string
dates.eq(i).text(d.toLocaleString());
}
From a practical point of view, it makes the text "flash" to the new value when the Javascript runs, and I don't like it.
From a principles point of view, I don't get why we need to do this - the browser should be able to localize standard things like currency, dates, numbers, as long as we mark it up as such.
A follow up question: Why do browsers/the Web not have such a simple feature - take a standard data item, and format it according to the client's settings?
I use toLocaleString() on my site, and I've never had a problem with the speed of it. How are you getting the server date into the Date object? Parsing?
I add a comment node right before I display the date as the server sees it. Inside the comment node is the date/time of that post as the number of milliseconds since epoch. In Rails, for example:
<!--<%= post.created_at.to_i * 1000 %>-->
If they have JS enabled, I use jQuery to grab those nodes, get the value of the comment, then:
var date = new Date();
date.setTime(msFromEpoch);
// output date.toLocaleString()
If they don't have JS enabled, they can feel free to do the conversion in their head.
If you're trying to parse the ISO time, that may be the cause of your slowness. Also, how many dates are we talking?
Unfortunately, there is not.
HTML & CSS are strictly used for presentation, as such, there is no "smarts" built in to change the way things are displayed.
Your best bet would be to use a server side language (like .NET, Python, etc.) to emit the dates into the HTML in the format you want them shown to your user.
It is not possible to do this with HTML, it has no smart tags that can make any kind of decisions like this. It is strictly presentational. I do wonder, though, if HTML5 perhaps has a tag for something like this...
Anyways, the way I see it, you have 3 options:
Stick to the Javascript way. There's questions with more details on it on this website, such as How do I display a date/time in the user’s locale format and time offset? and How can I determine a web user’s time zone?
Try to use geolocation. That is, your server side script fires off a request to one of the many geolocator services out there on the user's first page visit to try and guess where the user is. The downside of this is that it will be wrong about 10% of the time, so it's not that much better than the market share Javascript is going to get you.... (all in all, then, not a very good method...)
Ask the user! You will see that most websites that want to display a tailored experience for you will ask you this sort of thing because it's just not possible to know. As a neat fallback, you could wrap the question around <noscript> tags so you only ask those with Javascript disabled while offering the Javascript experience to those that have it.
Dojo has some pretty good localizations for dates and currencies. Using this method also allows you to pick different formats (e.g.: short date vs long date) and force locales.
The language and the user's locale should be sent on the HTTP header. You can use those to create the correct date format server-side to be displayed to the user. However, this is often undesirable because many users completely ignore their locale settings in their OS and/or browser. So, you may be feeding USA style timestamps to New Zealanders.
I liked the trick posted in the comment above, but it sounds like a QA headache, since you could be dealing with a large number of clients that implement timestamps in very different ways.
The most effective solution I have seen, is to simple provide a panel to allow your users to choose what time format they like. Some users even ****gasp**** like ISO formats. Then you do the time format conversion server side. If your application language does not have good locale to timezone formatting mapping, check your database. Many databases provide locale-based customized timezone formatting as well.
Because this anwser still popups in google I share that this is now possible to do by using a readonly datetime-local input (see below) and you can then style the input the way you want:
<input type="datetime-local" value="2018-06-12T19:30" readonly />
For more information see: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/datetime-local