I want to show the most recent image from a folder (Windows) and have the page (.html) automatically refresh, say, every 5 seconds. What's the easiest way to do this? I prefer not to install any software for this and do it in (for example) the browser.
It is not possible to get the creation date of an image using only JS.
You need to either try an AJAX solution, or use a specific name for the last saved file (f.e: "lastimg.png")
For the 5second refresh mechanism You can use setInterval.
Using this solution, this topic might also be useful for You.
For a more specific answer, try to ask a more specific question.
Related
We plan to create a Shopify app but we face some problems to find in documentations how to interact with pages.
I`m not sure we must ask every time users to add codes and etc, so I need to know if I miss something.
I need to interact with the product pages in Shopify from an app.
I search and read all the web for this and everything is how to start but not the actual examples.
I know for the ScriptTags and how to include them but that is.
If someone can give me a simple example of how for example to hide the Buy button and insert something on instead.
I know how to select it with the default theme with JQuery but what about all other themes?
There are two ways to interact with the front page:
1) Inject some code in the page ( the live one )
2) Use ScriptTag as you mentioned.
The code injection script will modify the product template for example and inject your code if you like to do this automatically or you can instruct the user to do so on their own, but if they are not code savvy there might be issues.
In addition this code will live only on the live theme in most cases. And if the user likes to delete your app at a specific time you must be sure to write the logic in such way that it won't affect the site if your app is no longer present ( since it will be really hard to clean up the files once you add the code automatically )
For this approach you will need to use the Asset API.
You will need to get the content of the file with a GET request to the file and make a put request in order to update it.
The better approach is to use ScriptTag API.
This will allow the use of a script file that will be attached on EVERY theme. This will not modify the theme files in any form or shape.
It seems that this is the approach that you are looking for.
Please have in mind that you will be the one hosting the file from your app so pretty much you can write what ever you like there. So if you like to use jQuery you must be sure that the themes have included jQuery or you will have to add the jQuery core code inside your script.
As for how to write a script tag, there is a pretty straightforward documentation here: https://help.shopify.com/en/api/reference/online-store/scripttag#create-2020-01
I'm attempting a scrapy-with-splash project to get a few fields off the website "https://sailing-channels.com/by-subscribers". This site uses java to retrieve and delete listings as you scroll.
I've not had any luck getting the splash server to give me the whole set of data, or any of the detailed listings for that mater.
My first question is can splash even do this?
I really don't care how I get this data. I would prefer doing it with a program but any tool that can get me fields from this site in an .csv file would do the job. Anyone have any suggestions?
Thanks for any advice
Why do you want render it? They have pretty good API, check https://sailing-channels.com/api/channels/get?sort=subscribers&skip=0&take=5&_=1548520116425. So you can iterate, increasing skip argument and parsing json each time.
Looks like very promising way.
I have a set of harvested atom feeds. Some of them have a few years, and some of the posts link to images that are no longer there.
Is there any way to get the most recent version kept by the Way Back Machine?
I know I can do it manually, but I'd like to automate the process. archive.org provides a restful API, but as far as I could find out it doesn't seem to provide the specific calls that I need. I suppose I could always fallback to web-scraping, but I'd prefer a more elegant solution, if there is one.
Figured it out. To get the latest version of a file you just have to GET the URL (don't forget to check that the HTTP status code is 200):
http://web.archive.org/web/form-submit.jsp?type=replay&url=<file_url>
Alright so I learned that to have an upload button on a page, what you do is basically call a php file (call is upload.php) that would upload a file to the server. I have no idea where I am supposed to put the php file inside the server so I can call it.
I feel stupid because I can't find any answers online. I am getting very frustrated and confused because I am told I need to create a database but I have no idea how to edit a database in Joomla. I took a class in SQL so I don't have to learn about that. I just don't know where it is. I was also told I need to make a component. But this is confusing because all I want to do is have an upload button that will upload an image to the server.
I understand your frustration. I've got the basic idea on what you are trying to do. Here are a couple of options:
You might wanna take a look at Joomla! Extensions Directory ™. You might just find there a component or a module that already does this for you.
If you want to do it on your own, than you need to create a small module or a component inside Joomla! Please refer to the Joomla! Documentation or tutorials on this topic. Please note that you won't get this working instantly, because you first need to understand how Joomla! works. So your upload.php file will go in your module / component files. I don't think you need to do any SQL.
Now the part with "allowing a user" is a bit confusing... you want to "allow" any user to upload things to your server or just let's say, registered users? Generally uploading scripts need to be very strong from the security point of view. If this is the case, that you need to do a search for Joomla! ACL
You can simply create a form and add the "media" field type.
http://docs.joomla.org/Standard_form_field_types
You can also opt for the "file" field types to allow different types of fields.
Both fields can be added using the Joomla Component Creator: http://www.notwebdesign.com/joomla-component-creator/
And you might also want to take a look at K2 which has an excellent image upload functionality that allows scaling of images into three different sizes.
I need to display pages in a tutorial fashion. I looked in to netsupport, beamyourscreen and other possibilities but, I do not want the viewers to download anything. I cannot use gd / send screenshots due to audio / video instructions embedded in some of the pages.
Basically, I need the ability to "refresh" a users browser window to a different page via an interface on my end. Whether via a form submission, javascript or any other type of "controller" that allows me to change the page on the viewers browser. PERL preferred but, PHP / javascript whatever works and is cross browser. I set up a simple javascript page forward timer that "works" but, page load times and conversation interruptions are a huge factor.
The entire tutorial website will be developed around this ability.
I was looking in to curl / cron / wget methods but, found little information.
I have seen forum and chat scripts that basically perform a similar task but, there must be a simple(ish) solution in leau of hacking up another script to suit my needs.
I do not want others to control the pages either. The site really, only needs to be accessable during the tutorial however, It "could" remain web accessable as long as user interaction was normal unless (being controlled).
The initial site concept is based on instructing people how to properly introduce new pets into a home. Will be operated by a veteranarian that saved my pets life. I wanted to give something back.
Possible? I really appreciate simple examples etc...
You have no other way but to keep polling the server for "instructions" using javascript. No, you can't send nothing to the end user browser, neither curl nor wget.
Mainly, you'll have to set up a simple request/response protocol between the browser and the server.
If you want to go deeper, you can use something like cometd/meteord/etc. If not, a hidden iframe that reloads himself and receives pages with javascript code for the needed actions can do the trick.
Another alternative.
With javascript dopolling and single character flatfile. Have a simple one character flatfile with a single var. Write it in perl (it is faster and uses less resources than php). The parent script calls a javascript variable in a flatfile. It hits the flatfile and goes wherever the var sets it. The flatfile is written to by the controller. Done.
I guess you could also rename an empty flatfile and use that as the controller. I am usure which is faster, open and read a specific file or hit the directory and return the file name. On the controller side, opening and writing to a file vs renaming a file. Maybe they counter each other in resources and time?
This way the site can act as a normal site. When you want to have remote users see a "presentation" (automatically being shown the site pages at the controllers pace), the controller activates polling and tells the viewers to push a start button. This allows a remote instructor to load pages for the viewers at his leisure.
It is a simple solution that works with nothing really sophisticated going on. No frames are needed either. Just need javascript enabled.
Any better suggestions are welcome!
It occurred to me that what you might want to use is HTML Push technology. Check out the wiki, they have several links. I have never used it myself