i develop some extension for google grome
i inject at document_end event my js (+jquery)
i set in manifest allFrames: true
my match url has frameset
my goal get element by id inside one of frame
i do
//wait for load my frame
$("frame[name='header']).load(function() {
//here I need get element by id inside this frame
});
how to do this properly?
PS: my frame is from the same domain
You dont need to do document load, I assume your doing this from a content script. Just place the "run_at" manifest to be document_end and within your content script you check if the current URL is that frame page, then you will be in that Domain.
Something like this:
if(location.href == 'http://someweb.com/path/to/page.html') {
var foo = document.getElementById('foo')
Something like that will get you started.
Related
I'm creating the Angular app which lets user save his html code (maybe it has style and script tag to control the view) and there is a live preview next to it. User can save the code and other users can come to see the code and the preview. I also worry about the security because of script tag and I want the script to work only with the code that user provides (Not allow to control or get the data in the parent frame). So I need some suggesting of how to do it.
I have tried the preview with iFrame by giving the value through the 'srcdoc' property, but it looks like the security is bad.
You would not need to use an iframe in that situation, you can just render an HTML string inside of a div element using the innerHtml input like so:
<div [innerHTML]="htmlString"></div>
Where htmlString is a string containing the HTML code. You will have to sanitize the content of that variable with the DomSanitizer.
constructor(private domSanitizer: DomSanitizer){}
...
ngOnInit() {
this.htmlString = this.domSanitizer.bypassSecurityTrustHtml(yourHTMLString);
}
I'm experimenting with Chrome browser extensions. I want to be able to take any text input into the browser (through the URL bar of the browser or onto text boxes on social media sites and so on) and send that text to a server. I'm wondering if this is possible in chrome and what functions I need to use to achieve this?
I suspect the logic of the extension would work something like this: any time a link is clicked where there is text in an input form / text box, extract that text or form input and send it using some JS requests library to a server.
Which Chrome API function can be used to get the text input into a form?
You can get DOM information (input, textareas, etc) using content_script which has direct access to the web page data. URL data can be accessed through either the popup.js or background.js using the chrome API chrome.tab.query.
In the past I have had the best luck using MutationObservers, this looks at real-time changes to the web page (or wherever you specify you want the observer to be). Then you can send that data to the server.
small example.
function extractinputdata() {
var inputdata = document.getElementById('some specfic HTML element')
if (inputdata != null) {
new MutationObserver(function(){
//when a change has been made to the element or its children, you can record the new data
}).observe(inputdata, {characterData: true, childList: false, subtree:true});
}
}
I have a Chrome extension that loads/injects a contentscript.js This script appends html and css to the webpage.
Currently I have the html and css written into my contentscript. What I would like is for the css itself, as well as the body of my new elements to be in separate document, mostly so it looks better than having html and css as text in a .js document.
Then in the contentscript I would do something like
node = the_html_doc.html
document.getElementsByTagName("body")[0].appendChild(node);
But how do I access such a separate document from my contentscript? It needs to be available in all tabs (I use the activeTab permission), not just the url in the manifest "matches".
A better solution would be to use a background script. What I did was to make a file called background.html that would store nothing but templates. I then had my background script (background.js) setup to communicate with my content script (content.js). The content script would send a message to the background script with a command indicating it wants a template. Leveraging jQuery, i can easily select and return a template to my content script which can then be injected into the page.
Here is the code (bits an pieces):
background.html
<div id="template-1"></div>
<div id="template-2"></div>
...
background.js
chrome.runtime.onMessage.addListener(function(cmd, sender, sendResponse){
c = JSON.parse(cmd);
if(c.cmd == "GET_TEMPLATE"){
//respond with the template referenced by c.selector
sendResponse($(c.selector).outerHTML);
}
});
content.js
var command = {cmd:"GET_TEMPLATE", selector:"#template-1"};
chrome.runtime.sendMessage(JSON.stringify(command), function(response) {
//and here you should get your template
console.log(response);
//you can start using jQuery like $(response) to alter it
});
This method has worked flawlessly for me. I not only use commands here but I use them everywhere now, it works well with message passing.
You might be able to use the web_accessible_resources manifest setting, then in your content script you can just inject a link element that points to the chrome.extension.getURL(<filename>) value for the CSS, and inject a script element of type text/html with an id, and then fetch the contents of that node and use those for your appendChild call.
I'm brand new to making Chrome Extensions and have done the simple tutorials, but I'm having trouble finding what I need. I want the extension to allow a user to chose an image on a webpage, and then copy the URL for that image into the extension. Can anyone help me out? I'm sure if I see an example I'd get a better grasp on how extensions can interact with a page.
From what I understand of your question, I'd say you want to create a context menu item that shows up when you right-click an image. For example, in your background script, use:
chrome.contextMenus.create({
title: "Use URL of image somehow",
contexts:["image"],
onclick: function(info) {
handleImageURL(info.srcUrl);
}
});
function handleImageURL(url) {
// now do something with the URL string in the background page
}
This will add a context menu item that shows up on all pages, but only when you right-click on images. When the user selects it, the onclick handler of the menu item fires handleImageURL with the URL of the image as the argument. The URL can be processed in any way you like, e.g., saved in a localStorage list, sent to a server via Ajax, or passed in a message to a listening content script in the current tab.
EDIT with alternative:
You might want a content script that gets injected into every page. The script could bind an event listener to every image element at load time:
// in my_content_script.js...
var imgs = document.getElementsByTagName("img");
for(var i = 0, i < imgs.length; ++i) {
imgs[i].addEventListener("click", function() {
alert(this.src);
// do things with the image URL, this.src
});
}
To inject it into all subdomains of example.com, your manifest would include:
...
"content_scripts": {
"matches":["*://*.example.com/*"],
"scripts":["my_content_script.js"]
},
...
Note that this pure-JS solution doesn't attach listeners to images dynamically added after load time. To do that in your content script with jQuery, use:
$(document).on("click", " img", function() {
alert(this.src);
});
And add your jQuery file name to the scripts array in your manifest, next to my_content_script.js.
Based on this Google Chrome Extension sample:
var images = [].slice.apply(document.getElementsByTagName('img'));
var imageURLs = images.map(function(image) {
return image.src;
});
chrome.extension.sendRequest(images);
For a more detailed example (e.g. how to handle the request), you can check out this extension I wrote called Image Downloader
I'd like to have my background page watch the URL and call chrome.tabs.executeScript on certain URLs. What API should I call to watch the URL in such a manner?
chrome.tabs.onUpdated.addListener can be used to detect tab loads. This will not detect navigation within frames though:
chrome.tabs.onUpdated.addListener(function(tabId, info, tab) {
if (info.status === 'complete' && /some_reg_ex_pattern/.test(tab.url)) {
// ...
}
});
For this purpose, you'd better use a content script, with all_frames set to true. Within the content script, you can inject code using the methods as described in this answer. Then use the page's location object to filter URLs.