I have an endpoint that takes a long time (about a minute) to give a response. I want to call this endpoint from a Wordpress website while wp_remote_get and wp_remote_retrieve_body are running in the background, but I always get the page loaded only after the request is finished.
Is there a way I can add some lazy process so that the page can be displayed and the user gets a 'loading, please wait..' message until the request content is retrieved? I have seen many methods for image lazy loading but not for an arbitrary php run in the server. I also want to hide the get url from the page source script, all js get solutions seem to expose the url requested.
Here's what you need to do.
Create your page -- maybe in your template -- with some placeholder text. Something like this might work:
<div id="jimmys-lazy-loading">
loading, please wait...
</div>
Extend the WordPress REST API by adding a custom endpoint to the code you're writing (your plugin or theme customizations, maybe). When you hit this REST endpoint from your web page, it will in turn hit that slow endpoint, retrieve the data, and return it.
Write some Javascript that hits your REST API and then replaces your placeholder text with the stuff that you got back.
Or, if your slow endpoint allows itself to be hit directly from your users' browsers, write your Javascript to hit it and replace the placeholder text.
Once you get the basics working, you can make a fancier "wait" display, maybe with a spinner.
It's hard to give more specific advice without knowing a bit more about what you hope to do. Don't hestitate to ask another question if you still need help.
Related
everyone. I am making a website with t-shirts. I dynamically generate preview cards for products using a JSON file but I also need to generate content for an HTML file when clicking on the card. So, when I click on it, a new HTML page opens like product.html?product_id=id. I do not understand how to check for id or this part ?prodcut_id=id, and based on id it generates content for the page. Can anyone please link some guides or good solutions, I don't understand anything :(.
It sounds like you want the user's browser to ask the server to load a particular page based on the value of a variable called product_id.
The way a browser talks to a server is an HTTP Request, about which you can learn all the basics on javascipt.info and/or MDN.
The ?product_id=id is called the 'query' part of the URL, about which you can learn more on MDN and Wikipedia.
A request that gets a page with this kind of URL from the server is usually a GET request, which is simpler and requires less security than the more common and versatile POST request type.
You may notice some of the resources talking about AJAX requests (which are used to update part of the current page without reloading the whole thing), but you won't need to worry about this since you're just trying to have the browser navigate to a new page.
Your server needs to have some code to handle any such requests, basically saying:
"If anybody sends an HTTP GET request here, look at the value of the product_id variable and compare it to my available HTML files. If there's a match, send a response with the matching file, and if there's no match, send a page that says 'Error 404'."
That's the quick overview anyway. The resources will tell you much more about the details.
There are some solutions, how you can get the parameters from the url:
Get ID from URL with jQuery
It would also makes sense to understand what is a REST Api and how to build a own one, because i think you dont have a backend at the moment.
Here some refs:
https://www.conceptatech.com/blog/difference-front-end-back-end-development
https://www.tutorialspoint.com/nodejs/nodejs_restful_api.htm
I have used php simple html dom to no success on this issue.
Now I have gone to DOMDocument and DOMXpath and this does seem promising.
Here is my issue:
I am trying to scrape data from a page which is loaded via a web service request after the page initially shows. It is only milliseconds but because of this, normal scraping shows a template value as opposed to the actual data.
I have found the endpoint url using chrome developer network settings. So if I enter that url into the browser address bar the data displays nicely in JSON format. All Good.
My problem arises because any time the site is re-visited or the page refreshed, the suffix of the endpoint url is randomly-generated so I can't hard-code this url into my php file. For example the end of the url is "?=253648592" on first visit but on refresh it could be "?=375482910". The base of the url is static.
Without getting into headless browsers (I tried and MY head hurts!) is there a way to have Xpath find this random url when the page loads?
Sorry for being so long-winded but I wanted to explain as best I could.
It's probably much easier and faster to just use a regex if you only need one item/value from the HTML. I would like to give an example but therefor I would need a more extended snippet of how the HTML looks like that contains the endpoint that you want to fetch.
Is it possible to give a snippet of the HTML that contains the endpoint?
I've been trying to figure out how the "live search" function at http://www.codeandtheory.com/#/work/ works. I've looked at in firebug, and have looked at a bunch of AJAX search tutorials but codeandtehory's seems to work a lot "smoother". Any ideas?
That page is not initiating any AJAX requests. All the data are already on the page, so the search simply shows or hides relevant results without needing to retrieve any new information from the server.
It's certainly smoother, since there's no lag for a network (AJAX) request, but it works only if it's feasible to put every possible search result on the page from the outset.
I would not say the site is smooth, it makes 107 separate requests, a total of 2.17Mb for the initial load.
I've coded an HTML page using jQuery for loading content. Now if I want to link directly to a submenu, is this possible to do with JavaScript?
So for example if someone goes to www.mydomain.com/submenu1/
then some JavaScript code will execute and load the needed contents?
Thanks a lot :)
Is it possible to realize that with htaccess?
You will more likely want to have a URL structure that only needs a page to load from the server once, then the server is only queried by JavaScript XMLHttpRequests. Loading content based on a "hard" URL would be pointless, since you're doing a server request anyways and might as well return the content in the response.
For keeping addresses unique while still keeping the "hard" URL the same (preventing multiple server requests), you can use the hash/anchor part of the URL. This means your address might look something like this: http://www.example.com/#/submenu1/
The #/submenu1/ part stays on the client, so only / on www.example.com is requested. Then it's up to your JavaScript to load the content relevant to /submenu1/. See a page of mine for an example of this: http://blixt.org/js#project/hash?view=code
Also have a look at this question: Keeping history of hash/anchor changes in JavaScript
I have been reading Yahoo's Best Practices For Speeding Up Your Website, but still have a question that I could really use your help with:
The very first page of my web app needs to display a bunch of data that is dependent on the city the user is in. On the first visit, the user is prompted to pick her city and I store a cookie in the browser recording which city to start with. On her following visits to the site, the Javascript code checks the cookie and retrieves the data for that city as JSON.
Given that this data is necessary to display the fundamental part of the page, where should I load it from? Currently I am doing it from the top of Jquery's $(document).ready(), but it occurred to me that by definition that only gets executed once the entire page has loaded.
Which is the correct way to do this? (Eg, will it improve matters if I instead put some Javascript in the that checks for the cookie and loads the JSON feed for the right city? Some other solution...?)
Thank you for any insight
lara
Currently I am doing it from the top
of Jquery's $(document).ready(), but
it occurred to me that by definition
that only gets executed once the
entire page has loaded.
$(document).ready() will be called when the DOM is ready for manipulation, not when the entire page has loaded. The DOM will be ready as soon as the markup has been read and parsed into the DOM. This occurs before the entire page has loaded.
Putting your code to check the cookie value and retrieve city-specified data in $(document).ready() is perfectly fine.
If you really need this data to show the page correctly, how about simply inlining the data in the page itself? Save yourself an AJAX round-trip, be nice to your users in sub-Saharan Africa on the 300 baud modem.
I think the $(document).ready() is as soon as you can do it, although I'm not sure why you wouldn't just inspect the cookie values on the first request. Just check to see if they are set, and if they are, get the content for the user there are save yourself having to make any AJAX call. Maybe I'm missing something in your situation, but cookies are always sent with every request to a specific domain so AJAX/JavaScript shouldn't be necessary.