I've made a code which displays an array which shows traffic lights flashing, should I save externally as script files or embed it into the HTML.
I also need to explain why I've done this.
Please I've got until over Christmas to finish this, I've looked everywhere and can't find much, so I'm turning to this where apparently experienced programmers are and who have done all this before.
Please don't close the question, I really need help. Thanks
What is the ultimate goal?
Code maintainability - use external script
Reuseability - use external script
Downloadtime/network i/o - a bit better if embedded.
Want the HTML/CSS redone by designer later - use external script
The more I think of it, the more reasons I see to put it extern.
And tge one I listed pro embed - that's nullified at second load (script from cache)
Revering to the MVC-Pattern I'd put it in an extra file. It's just better structured and better to read.
Another advantage is that you can reuse your code. Like if you'd have a second page which uses this code you would just need the include it there, too.
Related
Good evening, I'm working on a project with a team, we have to make a browser without using JEditorPane or any other class that reads HTML.
How can we do that? Do we need to make a new class that does what JEditorPane does? Can I find somewhere JEditorPane's code? Thanks!
Well, this is an answer:
If you need to display web content without using any pre-existing engine (such JEditorPanel or a ChromeBind), you need to read the HTML as a XML file and construct your native View based on it (without CSS and JS this is a fairly easy task) by constructing the screen based on a one-to-one equivalent of a HTML tag to a Java JComponent.
Modern Web Browsers are pretty complicated, so there are a lot of different pieces that come together to display a web page. In order to build a browser, you need to first understand what a browser is. For that, I recommend reading this tutorial.
Once you have an understanding of how a browser actually works you need to determine which pieces you can reuse and which pieces you have to write from scratch. Do you have to write the entire rendering engine? Good luck! Can you use an existing engine like Gecko or Webkit? Or maybe you can get a little closer to done and use the java port of Webkit?
Once you have a better understanding of the question come back and ask more direct questions when you get stuck at a specific piece. As it is, your first step is to gain an understanding of the problem you are trying to solve.
alright, after a few hours of searching and reading all over the net, I have broken down and decided to ask for help. I am working to automate many of the more medial and repetitive tasks as work, and stumbled upon AutoIt, I love the tool. anyway, Today's task is the export of a slew of tables and queries from Access 2007 in a few different formats. mostly CSVs some Tab delimited, and a couple of dBase DBFs and DBTs. now none of this is all that difficult and in fact the person who previously held my position created about a hundred Macros in the mdb that export the tables. seems to me that he fell well short of hastening the process as you still have to run each macro. I am looking to create an autoit script that will export the correct tables in the correct format to the correct place with the correct name. doesn't seem like it should be that difficult.
so thus far I have been imagining using ADO to tell Access to export which table in which format and where. but I cannot seem to find the necessary commands needed to do that. I also figured that perhaps, at least with the text based formats (CSV, txt, tab) I could read each record out of a given table or query and then build the text file myself in autoit, not the simplest way of doing it, but it could work. The problem arises when trying to create the dBase file, I haven't a clue where to begin with that.
I am open to using JAVA, AutoIt, PHP, or Perl to accomplish my task.
I should note that I am fairly new to ADO. the syntax in ADO seems to elude me frequently. so, any and all help is appreciated, please refrain from the "Just google it" responses. if you have a link to share, or a resource that you have found helpful please post that as well, I am not allergic to reading or doing research. Sometimes it just makes more sense to ask for help.
Thanks,
Kyle
If you are open to using VBA, you could probably make it work with only a little code and the DoCmd-Object.
To export as CSV, have a look at DoCmd.Transfertext
To export to dBase, have a look at DoCmd.TransferDatabase
If you have questions about using those, just ask in the comments and I will provide more information.
This is a sort of bonkers idea, but if you already know Java, you may be able to get this to work with the JDBC-ODBC bridge. You'll first have to register your particular Access database as a named ODBC data source, as the bridge does not appear to support on-the-fly ODBC. I don't have a Windows machine on hand and don't remember the exact sequence of steps to do that, but it should be available from the ODBC driver manager.
I change files like /etherpad/trunk/infrastructure/ace/www/ace2_inner.js and then run /etherpad/trunk/etherpad/rebuildjar.sh and yet when I run it again everything looks the same. Is there a trick I'm missing?
I've also tried running rebuildjar.sh with clearcache to no avail.
Look at bin/build.sh and track down which scripts are called directly and which scripts are called via subscripts. The whole thing is a mess :/
ace2_inner is perhaps one of the autogenerated .js files? What you need to do is read the first 10-20 lines of every source code file before you edit it, to make sure you're not editing an autogenerated file.
If you don't know the structure, then use bin/build.sh every time until you learn how to handle the source code. (This advice isn't actually etherpad-specific :)
And then make sure you've STOPPED all etherpad servers before starting up a new one.
Always clear the browser cache properly after changing the etherpad files. Otherwise none of your changes will show up.
I have to make a simple change to a HTML-Element (add and remove some attributes). The problem is that I have to go through a lot of HTML-files to do that.
How could I automate that? Sure, there are libraries for parsing and modifying HTML, but after looking at a few of them I am getting the feeling that most don't support saving the changes to the HTML-files.
Check out Html Agility Pack. There are plenty of examples out there.
I'd like to store then later display user-entered content securely with minimal effort (my goal is a web app not writing a bunch of security-related code).
EDIT: Google App Engine for Java
I'm working with the same issue myself; but I haven't had the chance to get it out into the real world yet; so please just keep in mind that MY ANSWER IS NOT BATTLE TESTED. USE AT YOUR OWN RISK.
First, you need to ask yourself if you're going to be allowing the user to use ANY html markup. So, for example, can the user enter a link? What about make bold text?
If the answer is NO, then it is fairly simple. Here is the idea of how to set the filter up:
http://greatwebguy.com/programming/java/simple-cross-site-scripting-xss-servlet-filter/
But personally, I don't like the filter being used in the first example; I just put it there to show you how to set the filter up.
I would recommend using this filter:
http://xss-html-filter.sourceforge.net/
So basically:
Setup the example from first link, get it working
Download the example from the second link, put it in your project in such a way you can access it from your code.
Rewrite the cleanXSS method to use what you downloaded from the second link. So probably something like:
private String cleanXSS(String value) {
return new HTMLInputFilter().filter( input );
}
If you do want to allow HTML (such as an anchor tag/etc) then it looks like the HTMLInputFilter has mechanisms to allow this; but it isn't documented so you'll have to figure it out by looking at the code yourself or provide your own way of filtering.
user-entered content securely with minimal effort (my goal is a web app not writing a bunch of security-related code).
How much security-related code you need to write depends on how much you are at risk (how likely is it someone would want to attack your site, which it self is related to how popular your site is).
For example if your writing a public notepad, which will have a total of 3 users, you can get away with the bare minimum, if however your writing a we hate China, Iran and all hackers/crackers app dealing with $1,000,000 worth of transactions an hour and 3 billion users, you may be a bit more of a target.
Simply put you shouldn't trust any data that comes from outside your app including from the datastore. All this data should be checked that it's what you expect.
I've not validated incoming Java Strings against XSS however removing HTML is normally good enough, and Jsoup looks interesting for this (See Remove HTML tags from a String )
Also to be sure you should ensure your outputting what you expect to be outputting and not the some JavaScript.
Most templating engines, including django's (which is bundled with App Engine), provide facilities to escape output to make it safe to print in HTML. In newer versions of Django, this is done automatically unless you tell it not to; in 0.9.6 (still the default in webapp), you pass your output values to |escape in the template.
Escaping on output is universally the best way to do this, because it means you have the original unmodified text; if you modify your escaping or output formatting later, you can still format text entered before that.
You can also use a service that will proxy all connections and block any XSS attempts. I know only one service like that - CloudFlare (but it doesn't mean there aren't others like that). Unfortunately security features goes in with Pro plan which is paid :(