With Selenium or JavaScript how could you get the (over the network) transferred size (bytes) of the loaded page including all the content, images, css, js, etc?
The preferred size is that of what goes over the network, that is compressed, only for the requests that are made, etc.
This is what you usually can see in dev tools, to the right in the network status bar:
If that's not possible, could one just get a total size of all the loaded resources (without compression, etc)? That would be an acceptable alternative.
The browser is Firefox, but if it could be done with some other Selenium compatible browser that would be acceptable also.
I guess this could be done using a proxy, but is there any JS or Selenium way to get such information?
If proxy is the only way, which one would one use (or implement) to keep things simple for such a task? Just implementing something in Java before setting up the driver?
(The solution should work at least on Linux, but preferably on Windows also. I'm using Selenium WebDriver via Java.)
For future reference, it is possible to request this information from the browser by javascript. However, at the time of writing no browser supports this feature for this specific data yet. More information can be found here.
In the mean time, for Chrome you can parse this information from the performance log.
//Enable performance logging
LoggingPreferences logPrefs = new LoggingPreferences();
logPrefs.enable(LogType.PERFORMANCE, Level.ALL);
capa.setCapability(CapabilityType.LOGGING_PREFS, logPrefs);
//Start driver
WebDriver driver = new ChromeDriver(capa);
You can then get this data like this
for (LogEntry entry : driver.manage().logs().get(LogType.PERFORMANCE)) {
if(entry.getMessage().contains("Network.dataReceived")) {
Matcher dataLengthMatcher = Pattern.compile("encodedDataLength\":(.*?),").matcher(entry.getMessage());
dataLengthMatcher.find();
//Do whatever you want with the data here.
}
If, like in your case, you want to know the specifics of a single page load, you could use a pre- and postload timestamp and only get entries within that timeframe.
The performance API mentioned in Hakello's answer is now well supported (on everything except IE & Safari), and is simple to use:
return performance
.getEntriesByType("resource")
.map((x) => x.transferSize)
.reduce((a, b) => (a + b), 0);
You can run that script using executeScript to get the number of bytes downloaded since the last navigation event. No setup or configuration is required.
Yes you can do it using BrowserMobProxy. This is a java jar which use selenium Proxy to track network traffic from client side.
like page load time duration, Query string to different services etc.
you can get it bmp.lightbody.net . This api will create .har files which will contain all these information in json format which you can read using
an online tool http://www.softwareishard.com/har/viewer/
I have achieved this in Python, which might save people some time. To setup the logging:
logging_prefs = {'performance' : 'INFO'}
caps = DesiredCapabilities.CHROME.copy()
caps['loggingPrefs'] = logging_prefs
driver = webdriver.Chrome(desired_capabilities=caps)
To calculate the total:
total_bytes = []
for entry in driver.get_log('performance'):
if "Network.dataReceived" in str(entry):
r = re.search(r'encodedDataLength\":(.*?),', str(entry))
total_bytes.append(int(r.group(1)))
mb = round((float(sum(total_bytes) / 1000) / 1000), 2)
Related
I have an old html page that creates a script file and executes it using:
fsoObject = new ActiveXObject("Scripting.FileSystemObject")
wshObject = new ActiveXObject("WScript.Shell")
I am trying to modify it and make it usable also from other browsers. If you know the answer stop reading and please answer. If there is no quick answer, here is the description of my attempts. I was successful in doing the job, but only when the script is shorter than 2000 characters. I need help for scripts longer than 2000 characters.
The webpage is for internal use only, so it is easy for me to create a custom URL protocol on each computer that runs a VBScript file from a network drive.
I created my custom URL Protocol that starts a VBScript file like this:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\MyUrlProtocol]
"URL Protocol"=""
#="Url:MyUrlProtocol"
"UseOriginalUrlEncoding"=dword:00000001
[HKEY_CLASSES_ROOT\MyUrlProtocol\DefaultIcon]
#="C:\\Windows\\System32\\WScript.exe"
[HKEY_CLASSES_ROOT\MyUrlProtocol\shell]
[HKEY_CLASSES_ROOT\MyUrlProtocol\shell\open]
[HKEY_CLASSES_ROOT\MyUrlProtocol\shell\open\command]
#="C:\\Windows\\System32\\WScript.exe \"X:\\MyUrlProtocol.vbs\" \"%1\""
In MyUrlProtocol.vbs I have this:
MsgBox "The length of the link is " & Len(WScript.Arguments(0)) & " characters"
MsgBox "The content of the link is: " & WScript.Arguments(0)
When I click on click me I see two messages, so everything works well (tested with Chrome and IE in Windows 7.)
It works also when I execute document.getElementById("test").click()
I thought this could be the solution: I would pass the text of the script to the VBS static script, which would create the dynamic script and run it, but with this system I can't pass more than ~2000 characters.
So I tried to split the text of the script in chunks smaller than 2000 characters and simulate several clicks on the link, but only the first one works.
So I tried with xmlhttp.open("GET","MyUrlProtocol:test",false);, but Chrome says Cross origin requests are only supported for HTTP.
Is it possible to pass more than 2000 characters to a VBScript script via a custom URL protocol?
If not, is it possible to call several custom URL protocols in sequence?
If not, is there another way to create a script file and run it from Javascript?
EDIT 1
I found a solution, but in Chrome only works when it likes, so I'm back to square one.
The code below in IE executes the script 4 times (correct), but in Chrome only the first execution runs.
If I change it to delay += 2000, then Chrome usually runs the script 2 times, but sometimes 1 and sometimes 3 or even 4 times.
If I change it to delay += 10000, then it usually runs the script 4 times, but sometimes misses one.
The function is always executed 4 times, both in Chrome and IE. What is weird is that the sr.click() sometimes does nothing and the function execution continues.
<HTML>
<HEAD>
<script>
var delay;
function runScript(text) {
setTimeout(function(){runScript2(text)}, delay);
delay += 100;
}
function runScript2(text) {
var sr = document.getElementById('scriptRunner');
sr.href='intelliclad:'+text;
sr.click();
}
function test(){
delay = 0;
runScript("uno");
runScript("due");
runScript("tre");
runScript("quattro");
}
</script>
</HEAD>
<BODY>
<input type="button" value="Run test" onclick="test()">
scriptRunner
</BODY>
</HMTL>
EDIT 2
I tried with Luke's suggestion of setting the next timeout from inside the call back but nothing changed (IE works always, Chrome whenever it likes).
Here is the new code:
var scripts;
var delay = 2000;
function runScript() {
var sr = document.getElementById('scriptRunner');
sr.href = 'intelliclad:' + scripts.shift();
sr.click();
if(scripts.length)
setTimeout(function() {runScript()}, delay);
}
function test(){
scripts = ["uno", "due", "tre", "quattro"];
runScript();
}
Some background: The page asks for the shape of a panel, which can be just a few parameters [nfaces=1, shape1='square', width1=100] or hundreds of parameters for panels with many faces, many slots, many fasteners, etc. After asking for all the parameters a script for our internal 3D CAD (which can be larger than 20KB) is generated and the CAD is started and asked to execute the script.
I would like to do all on the client side, because the page is served by a Domino web server, which can't even dream of managing such a complex script.
I didn't read your whole post...have an answer:
I too wish that custom url protocols can handle long urls. They simply do not. IE is even worse as some OSs only accept 800 chars.
So, here's the solution:
For long urls, only pass a single use token. The vbscript uses the token
and does a url get to your web server to get all of the data.
This is the only way I've been able to successfully pass lots of data around. If you ever find a clearer solution, please remember to post it here.
Update:
Note that this is the best way I have found to deal with the url protocol limitations. I too wish this was not necessary. This does work and works well.
You mentioned Dominos, so possibly you need something in a POS environment... I create a web based POS system, so we could face a lot of the same issues.
Suppose you want a custom url to print a pdf to the default printer without the annoying popup window. We need to do this thousands of times a day...
When building the web page, add the print button which when pressed calls the custom url: myproto://printpdf?id=12345&tocken=onetimetoken
this will execute your vbscript on the local desktop
in your vbscript, parse the arguments and react. In this case, your command is printpdf and the id is 123456 and you have a onetime tocken key.
have the vb script to an https get to: https://mydomain.com/APIs/printpdf.whatever?id=12345&key=onetimetoken
check the credentials based on the ip address and token, if all aligns, then return the contents of the pdf (you may want to convert the pdf to a byte array string)
now the vbscript has the pdf, assemble it and write it to a temp folder then execute a silent pdf print command (I use Sumatra PDF http://blog.kowalczyk.info/software/sumatrapdf/free-pdf-reader.html)
mission accomplished.
Since I do know what you what to do in your custom url and the general workflow, I can only describe how I've solved the sort url issue.
Using this technique, the possibilities are limitless. You have full control over the local computer running the web browser, you have a onetime use token which grants access to a web API with can return any sort of information you program.
You could write a custom url protocol to turn on the pizza oven if you wanted :)
If you are not able to create the server side code which is listening for vbscript's get request then this would not work.
You might be able to pass the data from the browser to the vbscript using the clipboard.
Update 2:
Since in this case the data is on the client (one single form can define hundreds of parameters), the server API doesn't know what to answer to the vb script request. So the workflow described above must be preceded by these two steps:
The onkeypress event executes a submit to send the current parameters to the server
The server replies with the refreshed form, adding to the body onload a call to a function which uses another submit to call the custom url, as described on point 1 listed above.
Update 3:
stenci, what you've added (in Update 2) will work. I would do it like this:
user presses a button saying I'm done editing the form
ajax post the form to the server
the server saves the data and attaches unique key to the datastore
the server returns the key to ajax callback function
now the client has a single use key and invokes the url schema passing the key
vbscript does an https get to the server and passes the key
server returns the data to the vbscript
It is a bit long winded. Once coded it will work like a charm.
The only other alternative I can see is to copy the form data to the clipboard using something like: http://zeroclipboard.org/
and then in vbscript see if you can read the clipboard like: Use clipboard from VBScript
How about creating an iFrame for each instance?
Something like this:
function runScript(text) {
var iframe = document.createElement('iframe');
iframe.src = 'intelliclad:'+text;
document.body.appendChild(iframe);
}
function test(){
runScript("uno");
runScript("due");
runScript("tre");
runScript("quattro");
}
You can then use css styling to make these iframes transparent / hidden.
You might not like this answer, but I've used this method in the past and it works.
Instead of relying on ActiveX, consider using a Java Applet, and JNI.
Basically, you have to make sure the native scripts you want to run are available on your client machine, along with a JNI wrapper.
The applet will have to be at least self signed, for the browser to allow it to load and access a native library. Once the JNI libraries are loaded, you can easily call methods from the page / applet.
As a consequence of using Java, you could possibly use the same applet for windows as well as linux clients, provided of course you have native libraries present on the respective clients.
This series of articles talks about precisely your problem : http://www.javaworld.com/article/2076775/java-security/escape-the-sandbox--access-native-methods-from-an-applet.html
P.S the article is really old, but the concept remains unchanged.
We've got a single page app built with Knockout and Backbone which makes Ajax calls to the server and does some complex data caching and DOM rendering. We're really like to measure the performance (and log it back to the server) as seen by the user. I can't seem to get my head wrapped around whether the browser Navigation Timing API is going to be useful for this or not. From what I see in examples, the Navigation Timing API is tied to window.performance and this is limited to the page load and not suitable for monitoring Ajax behavior. True or false? If false, what else can I use?
I'd love to set custom instrumentation points between which to measure time, e.g. for an Ajax call that does some DOM rendering with a server result.
1 - True, window.performance is tied to page load. See example below which shows this:
<button id='searchButton'>Look up Cities</button>
<br>
Timing info is same? <span id='results'></span>
<script type="text/javascript" src="//code.jquery.com/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js"></script>
<script type="text/javascript">
jQuery('#searchButton').on('click', function(e){
// deep copy the timing info
var perf1 = jQuery.extend(true, {}, performance.timing);
// do something async
jQuery.getJSON('http://ws.geonames.org/searchJSON?featureClass=P&style=full&maxRows=10&name_startsWith=Denv', function() {
// get another copy of timing info
var perf2 = jQuery.extend(true, {}, performance.timing);
// show if timing information has changed
jQuery('#results').text( _.isEqual( perf1, perf2 ) );
});
return false;
});
</script>
Also, even if you did get it working you'd have missing data from old browsers that don't support this object.
2 - The Boomerang project seems to go beyond the web timing API and also supports older browsers. There is a talk with slides and sample code by the current maintainer listed in this conference. Sorry no direct link.
You can now use the User Timing API (W3C Recommendation 12 December 2013) which provides a way that you can insert API calls at different parts of your Javascript and then extract detailed timing data.
You do that using mark(), it lets you work out how much time it took you hit that ‘mark’ in your web application, and then measure() to calculate the time elapsed between your marks.
For your specific case you can have something like this:
app.render = function(content){
myEl.innerHTML = content;
window.performance.mark('end_render');
window.performance.measure('measure_render', 'start_xhr', 'end_render');
};
var req = new XMLHttpRequest();
req.open('GET', url, true);
req.onload = function(e) {
window.performance.mark('end_xhr');
window.performance.measure('measure_xhr', 'start_xhr', 'end_xhr');
app.render(e.responseText);
}
window.performance.mark('start_xhr');
myReq.send();
There seems to be patchy support for window.performance.getEntries(), which will give you details of all resources loaded into a page along with their URLs. I use this API for jsonp (not XMLHttpRequest) requests in AzurePing.info for the browsers that support it, falling back to new Date().getTime() for those that don't.
At time of writing, IE 10 and Chrome support getEntries, but Firefox does not. Unfortunately, not all the timing properties are set - even in Chrome and IE. All I could rely on was a fetchStart, responseEnd, and duration.
Sample source is on GitHub.
The Navigation Timing API is in my opinion not really helpful when it comes to measuring single page application performance.
Along with the already mentioned User Timing API, the Resource Timing API is actually much more helpful. This API provides functionality to retrieve the timings for all requests made in a user session (actually all you see in the network tabs of the developer tools in most browsers). These timings include Round-Trip times as well as DNS-lookup times etc.
Unfortunately, this is a relatively new specification and is not yet implemented accross all browsers. Chrome and IE > 10 provide implementations (although not yet complete). Surprisingly, IE seems to have implemented the most unitl now...
There are two ways to do it
Resource Timing API
Wrapping XMLHTTPRequest
Lets see the differences between them.
1. Resource Timing API
Browsers add supports for Resource Timing API recently. Resource Timing API basically has timing information about each and every resources loaded from app. It may be css, javascript or AJAX requests. You can get list of resources details as
performance.getEntriesByType('resource');
It will return array of object where you can find AJAX requests by initiatorType which is equal to xmlhttprequest. But there are some limitation.
By default, maximum resource size is 150. Above array only have maximum of 150 resources. If you want more, you can increase buffer size as performance.setResourceTimingBufferSize(500).
You will not get information about whether the AJAX requests is succeed or failed.
2. Wrapping XMLHTTPRequest
If you can wrap your XMLHTTPRequest API, you will get all information that you need from timing, status code and byte size. But you have to write lot of code and ofcourse test, test and test.
[Disclaimer] I work for atatus.com where we help you to measure page load time, AJAX timing and custom transaction. Also you can see session traces about how each and every resources perform.
I have seen a number of questions that don't answer this, is it possible to check someones bandwidth using java script and load specific content based on it?
The BBC seem to give me low quality images when using my mobile and in the middle of nowhere.
by the looks of this this cool service does this and its a CDN so it could be server side.
http://www.resrc.it/docs/
Does anyone know how they do it? or how I could do it using asp.net or javascript, or an community opensource plug in.
I think it may be possible with https://github.com/yahoo/boomerang/ but not sure this is its true purpose.
Basically you do this like this:
Start a timer
Load an fixed size file e.g a image through an ajax call
Stop the timer
Take some samples and compute the average badwidth
Somethign like this could work:
//http://upload.wikimedia.org/wikipedia/commons/5/51/Google.png
//Size = 238 KB
function measureBW(cnt, cb) {
var start = new Date().getTime();
var bandwidth;
var i = 0;
(function rec() {
var xmlHttp = new XMLHttpRequest();
xmlHttp.open('GET', 'http://upload.wikimedia.org/wikipedia/commons/5/51/Google.png', true);
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
var x = new Date().getTime() - start;
bw = Number(((238 / (x / 1000))));
bandwidth = ((bandwidth || bw) + bw) / 2;
i++;
if (i < cnt) {
start = new Date().getTime();rec();
}
else cb(bandwidth.toFixed(0));
}
};
xmlHttp.send(null);
})();
}
measureBW(10, function (e) {
console.log(e);
});
Not that var xmlHttp = new XMLHttpRequest(); won't work on all browsers, you should check for the UserAgent and use the right one
And of course its just an estimated value.
Heres a JSBin example
Start a timer.
Send a AJAX request to your server, requesting a file of known size.
When the AJAX request's done loading, stop the timer, and calculate the bandwidth from the passed time and file size.
The problem with JavaScript is that users can disable it. (Which is more common on phones, that happen to be better off with smaller images)
I've knocked this up based on timing image downloads (ref: http://www.ehow.com/how_5804819_detect-connection-speed-javascript.html)
Word of warning though:
It says my speed is 1.81Mbps,
But according to SpeedTest.Net my speeds are this:
The logic of timing the download seems right but not sure if it's accurate?
Well, like I said in my comments, you can choose 2 approaches:
1) You are in the context of a mobile app, then you can query the technology used by the device directly so you can notify the server directly what type (and size) of content you area able to render. I think phone gap can help you with accessing some of the native mobile API's using JavaScript.
2) The server-timer thing. You can "serve" some files yourself, lets say you have a magic file in your landing page, that, as soon as the client request the file, you grab this HTTP request with a custom handler. You "manually" serve the file by writing to the output stream, and you measure the bytes send and the time it took to reach the EOF, then you can somehow measure the bandwith. Combine this with the session cookie and you have this information per connected browser.
While this isn't an answer, it may be important to note that measuring bandwidth isn't always reliable.
http://www.smashingmagazine.com/2013/01/09/bandwidth-media-queries-we-dont-need-em/
To paraphrase the above:
...the number of bits downloaded divided by the time it took to download them...is true when you download a large file over a single warmed-up TCP connection. That is rarely the case.
Typical page load scenario:
Initial HTML page is downloaded using slow-start mechanism, so measurement will significantly underestimate the available bandwidth
CSS and JavaScript external resources are loaded -- a collection of new TCP connections, all in their slow-start phase, and they are not all necessarily to the same destination server
Images are loaded -- multiple connections, each one downloading a resource. The problem is that these connections are not always in the same phase of their life cycle. Some might be in the slow-start phase; some may have suffered a packet loss and, thus, reduced their window and the bandwidth they are trying to fill; and some might be warmed-up TCP connections, ready to fill the bandwidth. These TCP connections are not necessarily all to the same destination server, and the bandwidth towards the various destination servers might be different between one another.
So, estimating bandwidth is possible, but it is far from simple, and it is possible only for certain phases of the page-loading process. And because having several TCP connections to various destination servers is common (for example, a CDN could host the image resources of a Web page), we cannot really tell what is the bandwidth we want to measure.
Since this is an older question, the alternative suggestion at the end of the article is to consider the more recent srcset attribute for responsive imagery, which lets the browser decide which asset to load based on whatever it knows (which should be more than us). It sounds like it's weighted more towards just determining resolution, but maybe it'll get smarter as support goes up.
I have released BwCh which is an open-source JavaScript API to detect bandwidth for web-based environments
It is built with ES2015. It uses some of the latest JavaScript innovation (window.navigator.connection currently supported in Chrome 48+ for Android as of April 2016) in order to provide a flexible method to detect bandwidth for both mobile and desktop devices. It fallbacks/complements to image pre-loading to detect bandwidth where those newest API are not available.
Was wondering if there is any way in Silverlight to open a new browser tab and set its content. In short, my app receives files (binary data) and needed to have the user's browser presenting them.
My app downloads contents (images/pdfs/whatever) from repositories from the cloud and stores them as binary data in a local cache; then after that I need a way to display those now local contents to the end user in a new tab. The "new tab" requirement is due to silverlight not supporting rendering of many file types such as .gif, .pdf and others - things that browsers handle easily, either natively or with widely used plugins. So my current WTF-y solution uses System.Windows.Browser and consists in the following:
// Get document and body
var doc = HtmlPage.Document;
var body = doc.Body;
// Create a <form> element and add it to the body
var newForm = doc.CreateElement("form");
newForm.SetAttribute("action", "www.example.com/contentpresenter.php");
newForm.SetAttribute("enctype", "multipart/form-data");
newForm.SetAttribute("method", "POST");
newForm.SetAttribute("target", "_blank");
body.AppendChild(newForm);
var inp = doc.CreateElement("input");
inp.SetAttribute("type", "text");
inp.SetAttribute("name", "mcontent");
inp.SetAttribute("value", Tools.ToBase64( content.Content as Stream ));
newForm.AppendChild(inp);
var inpt = doc.CreateElement("input");
inpt.SetAttribute("type", "text");
inpt.SetAttribute("name", "tcontent");
inpt.SetAttribute("value", content.ContentType);
newForm.AppendChild(inpt);
// Send away!
newForm.Invoke("submit");
In short, it creates a javascript script that posts the content to a remote PHP script which in turn does nothing more than decoding and presenting the content, which will open in a new tab. Yes, I'm fully aware of how idiotic it sounds - but does the trick and works as intended.
As far as I know, creating a new HtmlWindow and building up/altering its contents is not an option due to security constraints. An obvious option is having Silverlight produce javascript which would in turn create a new tab that loads the provided content, but javascript is not too big in handling binary or base64 data - at least not cross-browser seamlessly - and the whole thing seems stupid anyways.
Is there a solution to achieve this solely through Silverlight, or at least with a minimum amount of javascript involved? Alternatively, is there any javascript library you would recommend to handle base64 data?
Best regards!
I recomend you to find Telerik's silverlight components sources and use RadHtmlPlaceholder (slightly buggy).
+ You can enable trusted application to run inside the browser for SL 5 and use WebBrowser control (best quality) but for windows only.
Is it possible to to take a screenshot of a webpage with JavaScript and then submit that back to the server?
I'm not so concerned with browser security issues. etc. as the implementation would be for HTA. But is it possible?
Google is doing this in Google+ and a talented developer reverse engineered it and produced http://html2canvas.hertzen.com/ . To work in IE you'll need a canvas support library such as http://excanvas.sourceforge.net/
I have done this for an HTA by using an ActiveX control. It was pretty easy to build the control in VB6 to take the screenshot. I had to use the keybd_event API call because SendKeys can't do PrintScreen. Here's the code for that:
Declare Sub keybd_event Lib "user32" _
(ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Public Const CaptWindow = 2
Public Sub ScreenGrab()
keybd_event &H12, 0, 0, 0
keybd_event &H2C, CaptWindow, 0, 0
keybd_event &H2C, CaptWindow, &H2, 0
keybd_event &H12, 0, &H2, 0
End Sub
That only gets you as far as getting the window to the clipboard.
Another option, if the window you want a screenshot of is an HTA would be to just use an XMLHTTPRequest to send the DOM nodes to the server, then create the screenshots server-side.
Another possible solution that I've discovered is http://www.phantomjs.org/ which allows one to very easily take screenshots of pages and a whole lot more. Whilst my original requirements for this question aren't valid any more (different job), I will likely integrate PhantomJS into future projects.
Pounder's if this is possible to do by setting the whole body elements into a canvase then using canvas2image ?
http://www.nihilogic.dk/labs/canvas2image/
A possible way to do this, if running on windows and have .NET installed you can do:
public Bitmap GenerateScreenshot(string url)
{
// This method gets a screenshot of the webpage
// rendered at its full size (height and width)
return GenerateScreenshot(url, -1, -1);
}
public Bitmap GenerateScreenshot(string url, int width, int height)
{
// Load the webpage into a WebBrowser control
WebBrowser wb = new WebBrowser();
wb.ScrollBarsEnabled = false;
wb.ScriptErrorsSuppressed = true;
wb.Navigate(url);
while (wb.ReadyState != WebBrowserReadyState.Complete) { Application.DoEvents(); }
// Set the size of the WebBrowser control
wb.Width = width;
wb.Height = height;
if (width == -1)
{
// Take Screenshot of the web pages full width
wb.Width = wb.Document.Body.ScrollRectangle.Width;
}
if (height == -1)
{
// Take Screenshot of the web pages full height
wb.Height = wb.Document.Body.ScrollRectangle.Height;
}
// Get a Bitmap representation of the webpage as it's rendered in the WebBrowser control
Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
wb.Dispose();
return bitmap;
}
And then via PHP you can do:
exec("CreateScreenShot.exe -url http://.... -save C:/shots domain_page.png");
Then you have the screenshot in the server side.
This might not be the ideal solution for you, but it might still be worth mentioning.
Snapsie is an open source, ActiveX object that enables Internet Explorer screenshots to be captured and saved. Once the DLL file is registered on the client, you should be able to capture the screenshot and upload the file to the server withing JavaScript. Drawbacks: it needs to register the DLL file at the client and works only with Internet Explorer.
We had a similar requirement for reporting bugs. Since it was for an intranet scenario, we were able to use browser addons (like Fireshot for Firefox and IE Screenshot for Internet Explorer).
This question is old but maybe there's still someone interested in a state-of-the-art answer:
You can use getDisplayMedia:
https://github.com/ondras/browsershot
The SnapEngage uses a Java applet (1.5+) to make a browser screenshot. AFAIK, java.awt.Robot should do the job - the user has just to permit the applet to do it (once).
And I have just found a post about it:
Stack Overflow question JavaScript code to take a screenshot of a website without using ActiveX
Blog post How SnapABug works – and what they should do
I found that dom-to-image did a good job (much better than html2canvas). See the following question & answer: https://stackoverflow.com/a/32776834/207981
This question asks about submitting this back to the server, which should be possible, but if you're looking to download the image(s) you'll want to combine it with FileSaver.js, and if you want to download a zip with multiple image files all generated client-side take a look at jszip.
You can achieve that using HTA and VBScript. Just call an external tool to do the screenshotting. I forgot what the name is, but on Windows Vista there is a tool to do screenshots. You don't even need an extra install for it.
As for as automatic - it totally depends on the tool you use. If it has an API, I am sure you can trigger the screenshot and saving process through a couple of Visual Basic calls without the user knowing that you did what you did.
Since you mentioned HTA, I am assuming you are on Windows and (probably) know your environment (e.g. OS and version) very well.
If you are willing to do it on the server side, there are options like PhantomJS, which is now deprecated. The best way to go would be Headless Chrome with something like Puppeteer on Node.JS. Capturing a web page using Puppeteer would be as simple as follows:
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://example.com');
await page.screenshot({path: 'example.png'});
await browser.close();
})();
However it requires headless chrome to be able to run on your servers, which has some dependencies and might not be suitable on restricted environments. (Also, if you are not using Node.JS, you might need to handle installation / launching of browsers yourself.)
If you are willing to use a SaaS service, there are many options such as
Restpack
UrlBox
Screenshot Layer
A great solution for screenshot taking in Javascript is the one by https://grabz.it.
They have a flexible and simple-to-use screenshot API which can be used by any type of JS application.
If you want to try it, at first you should get the authorization app key + secret and the free SDK
Then, in your app, the implementation steps would be:
// include the grabzit.min.js library in the web page you want the capture to appear
<script src="grabzit.min.js"></script>
//use the key and the secret to login, capture the url
<script>
GrabzIt("KEY", "SECRET").ConvertURL("http://www.google.com").Create();
</script>
Screenshot could be customized with different parameters. For example:
GrabzIt("KEY", "SECRET").ConvertURL("http://www.google.com",
{"width": 400, "height": 400, "format": "png", "delay", 10000}).Create();
</script>
That's all.
Then simply wait a short while and the image will automatically appear at the bottom of the page, without you needing to reload the page.
There are other functionalities to the screenshot mechanism which you can explore here.
It's also possible to save the screenshot locally. For that you will need to utilize GrabzIt server side API. For more info check the detailed guide here.
As of today Apr 2020 GitHub library html2Canvas
https://github.com/niklasvh/html2canvas
GitHub 20K stars | Azure pipeles : Succeeded | Downloads 1.3M/mo |
quote : " JavaScript HTML renderer The script allows you to take "screenshots" of webpages or parts of it, directly on the users browser. The screenshot is based on the DOM and as such may not be 100% accurate to the real representation as it does not make an actual screenshot, but builds the screenshot based on the information available on the page.
I made a simple function that uses rasterizeHTML to build a svg and/or an image with page contents.
Check it out :
https://github.com/orisha/tdg-screen-shooter-pure-js