I couldn't really find anything online for what I was looking for.
Currently, I have some php code that grabs news feeds and every time the loop runs through, it stores it in an array slot {0,1,2} etc. The interesting part is, I don't know how to refresh the php rss grab function without refreshing the page.
Essentially I have index.php, and with code inside, and I'd like to re-run the php script in those arrows <> through javascript.
I know in javascript you can assign script names and call them in html, that's essential what I want to do but for php, is it possible?
Currently your RSS fetching logic is intertwined with your presentation logic. You need to separate them so the RSS logic can be called independently.
Consider a structure like this:
rss.php - script with logic to fetch RSS feed and package it up as PHP array
index.php - require(s) rss.php and wraps the results in HTML
api.php - another script which require(s) rss.php, but responds with JSON data that can be consumed by Javascript
Now you can present the RSS data when the page loads and then periodically call api.php via Javascript to update the results.
You could also forgo calling rss.php from index.php, merely have it present an HTML skeleton with the javascript and when the page loads, have the javascript call api.php right away to build the initial list. That way you don't have the presentation logic in two places.
PHP is a server-side language, meaning your script will be run by the server before it is returned to your client (the browser).
What you can do if you want to continuously get new data from your script is call your server periodically with JavaScript using an AJAX call and display that to your user.
See this and this.
Related
I need to do this for a university assignment. I can only use jQuery and JavaScript. My professor has given us an API for interacting with the database, so that means we have a directory containing a lot of .php scripts we can call from the jQuery and JavaScript.
Basically I have an Accounts.html page which will display user information based on the clicked list item in another page called Projects.html which contains an ul with one li for each user.
I have everything ready to go up to this point, but I don't understand how I could possibly send data to a .html page then load it from a script within that page without making it a .php page (meaning I'd be able to use POST data).
I suppose I could possibly use GET data, but I'd much rather use POST.
Or can you use POST with .html pages?
Please share your thoughts as to which solution would be best.
Thank you!
Your question is still a bit vague...it would be better if I knew exactly what you were trying to do. In terms of a general idea of how JavaScript can load other files...
You can load external HTML files into sections of your code with jQuery's load method:
http://api.jquery.com/load/
Or you can more directly control the data using jquery's get method:
http://api.jquery.com/jquery.get/
and then subsequently processing the HTML data to get the data you need out of it. E.g. you could use get to get the HTML data...then put that HTML data into jQuery and grab the UL tags out of it and do further processing on those:
$.get('some/file',function(result) {
var $uls = $(result).find('ul');
}
Background:
I am using node.js and a module called scrap (with jQuery) to screen scrape a website and display some of its information on my own website
To do this, I am making a JSON of data available at a certain path in my website so that the client can retrieve the information when they load the client-side javascript
I am exporting a variable in the JSON called isLoaded that will be true if the server has finished loading all of the data for the json
Problem:
Since scrap and jquery make asynchronous calls and load them into the data variable that is sent with the JSON, all of the information might not be included in the JSON just yet
This is fine most of the time, but take for instance the example when I access the page that loads that data and the server is still populating the data that is exported with the JSON object
This essentially requires the client to refresh the page until all of the data is loaded.
Question:
Is there a way to continuously call $http.get(...path...) inside the client-side javascript until the variable 'isLoaded' returns true?
Note:
I have already tried a loop but for some reason the loop can't get new data once it's running. Also, I have tried to the best of my ability to find an answer on Google with no luck. If anyone could point me in the right direction, I would appreciate it.
I have two web pages that I'll call domain.com/Alvin and domain.com/Bert for this example.
Alvin displays search results based on a query string variable, but it loads the results using JavaScript approximately two seconds after the page loads.
Bert needs to use these results for occasional ad-hoc reporting, but due to the way the company is set up, I can't link directly into the database that Alvin is pulling from. A different team manages the Alvin page, so I won't have access to change their existing code.
While I think I could do this with .NET, I'm unsure of how to do the request with PHP which is highly preferred for the page.
Is anybody aware of how I could use file_get_contents, file_get_html or any other PHP functions to get the HTML of another page but only pull the HTML five seconds after the initial request to allow the JavaScript to update the results?
Credit to mplungjan - not sure why I didn't think of this earlier, but I was able to replicate the AJAX to the same request. Thanks!
Since they are on the same domain, one page can ajax the other page in – mplungjan
I am developing a web app which functions in a similar way to a search engine (except it's very specific and on a much smaller scale). When the user gives a query, I parse that query, and depending on what it is, proceed to carry out one of the following:
Grab data from an XML file located on another domain (ie: from www.example.com/rss/) which is essentially an RSS feed
Grab the HTML from an external web page, and proceed to parse it to locate text found in a certain div on that page
All the data is plain text, save for a couple of specific queries which will return images. This data will be displayed without requiring a page refresh/redirect.
I understand that there is the same domain policy which prevents me from using Javascript/Ajax to grab this data. An option is to use PHP to do this, but my main concern is the server load.
So my concerns are:
Are there any workarounds to obtain this data client-side instead of server-side?
If there are none, is the optimum solution in my case to: obtain the data via my server, pass it on to the client for parsing (with Javascript/Ajax) and then proceed to display it in the appropriate form?
If the above is my solution, all my server is doing with PHP is obtaining the data from the external domains. In the worst (best?) case scenario, let's say a thousand or so requests are being executed in a minute, is it efficient for my web server to be handling all those requests?
Once I have a clear idea of the flow of events it's much easier to begin.
Thanks.
I just finish a project to do the same request like your req.
My suggestion is:
use to files, [1] for frontend, make ajax call to sen back url; [2] receive ajax call, and get file content from url, then parse xml/html
in that way, it can avoid your php dead in some situation
for php, please look into [DomDocument] class, for parse xml/html, you also need [DOMXPath]
Please read: http://www.php.net/manual/en/class.domdocument.php
No matter what you do, I suggest you always archive the data in you local server.
So, the process become - search your local first, if not exist, then grab from remote also archive for - 24 hrs.
BTW, for your client-side parse idea, I suggest you do so. jQuery can handle both html and xml, for HTML you just need to filter all the js code before parse it.
So the idea become :
ajax call local service
local php grab xm/html (but no parsing)
archive to local
send filter html/xml to frontend, let jQuery to parse it.
HTML is similar to XML. I would suggest grabbing the page as HTML and traversing through it with an XML reader as XML.
I am making a website but I get a bit lost programming dynamic sites.
The user needs to enter x (inside a textbox), click submit, process in java (serverside) and present outcome as a report to the user (using javascript).
I'm at the moment using JSP to process the users input but now I need to pass the JSON code into the javascript. The javascript requires JSON data.
At the moment I have JSP which returns the necessary JSON code and the Javascript which works with hardcoded JSON code. I need to somehow store the returned JSON (from the JSP) in a variable and pass it to the Javascript. I have a vague understanding of AJAX - i'm just unsure if this is possible and how to link it all together.
Thank you.
Your JSP "page" can simply generate JSON directly. There's no reason the output from JSP has to be HTML. From the client, therefore, you POST to the server, the JSP runs, and the result (pure JSON from your JSP) is sent back to the client as the ajax response.
Sounds like the perfect place for AJAX - you can submit the request with javascript, and when it comes back process it further with javascript. Unless you want the page to refresh.
If you are using jQuery, you can look here to see how to implement it, should be relatively painless: http://api.jquery.com/jQuery.post/