I need to follow these steps:
Load an script text encoded base64 using Ajax (multiline included before encode).
Edit and Decode using atob()
Run it like in eval().
But I have some issues:
eval() doesn't works because It can't have line break.
I can't use "dataType=script" in Ajax because when dataType is script I just can't edit it before run.
I've tried to remove all comments and line breaks from loaded codes but it doesn't works. I got some errors and I things it's not the best way to do it.
I've tried:
var F = new Function(atob(data));
F();
But it doesn't works.
The only way to works was:
var script = "<script type='text/javascript'> " + atob(data) + " </script>";
$('body').append(script);
But I can't use that because my project will load a lot of requests and it isn't the ideal way since will add a lot of script tags in the DOM. In addition It is not synced with my main codes.
I need create a PDF from an HTML view rendering with Javascript Apis
This is my code in PHP Laravel 4
$con = Contrato::find($id);
$html = (string) View::make('contratos.contratopdf')->with('con',$con)->render();
return PDF::load(utf8_decode($html), 'A5', 'landscape')->show();
In the view I have this script
<script src="http://test.rentacar.cl/js/lib/jquery.signaturepad.min.js"></script>
This js change the Dom in a normal HTML but when I show in PDF don't work.
Thanks!!
PhantomJS works nicely, take a look at this package: https://github.com/jonnnnyw/php-phantomjs
Full documentation here: http://jonnnnyw.github.io/php-phantomjs/
Example:
<?php
use JonnyW\PhantomJs\Client;
$client = Client::getInstance();
$request = $client->getMessageFactory()->createCaptureRequest('http://google.com');
$response = $client->getMessageFactory()->createResponse();
$file = '/path/to/save/your/screen/capture/file.jpg';
$request->setCaptureFile($file);
$client->send($request, $response);
From my experience of dompdf(very famous pdf library),those library don't support JS interpreting(because the php don't have the power to interpret the javascript),here are two workaound I think you can try.
1.Server side rendering html,move your dom manipulation to php in order to create the dom element.(Recommended)
2.Use php and phantomJS.The php call phantomJS to capture the screen of html and saved the screenshot to pdf.
I have a simple html file in which there's javascript code referring to google charts.
The code I use is this (I'll show the important part):
function drawChart(){
var data = google.visualization
.arrayToDataTable([ ['Label', 'Value'],['Temp', 22.75],]);
// etc...
}
I use a bash command (sed) to replace that 22.75 value with a new one from the last line of a .txt file. However, this throws some errors which I haven't been able to neither correct nor ever identify.
So is there any javascript code that takes that file, extracts the last value and simply displays it on the right place of the code?
UPDATE:
Sorry for the lack of info in this question, I really appreciate all the people that took the time on reading my question. I'll try to fill with more information in the next minutes.
I am able to extract the last line of the .txt file, extract the value on the right part of the '-' symbol and store it in a variable. Then that value is taken to update the html file with a sed command. The error comes when the value is updated but with no value. I guess that happends due to a failed record of temperature in the txt file, then the extracted value is a null. Finally is the html fiel with javascrit code happens to be like this:
(...)['Temp', ],]);
Then the updater can't update the value since due to the way that sed command is written I guess there's no way that it can detect a no-number-value in there. So the html remains without a value all the time.
TXT File structure:
(...)
20:25:03-23.312
20:26:02-23.312
20:27:03-23.375
20:28:03-23.375
20:29:02-23.375
20:30:02-23.312
Bash script:
# (...code...)
lastRecord=`cat /home/pi/scripts/temp_control/logs/"$today".log | awk 'END{print}'`
function rightNow {
lastTemp=`echo $lastRecord | cut -d'-' -f2`
timeOfTemp=`echo $lastRecord | cut -d'-' -f1` # Not used yet
#Command used to update
sed -i "s/['Temp', [0-9]\{1,2\}.[0-9]\{1,3\}]/$lastTemp]/" /var/www/rightnow.html
}
rightNow
You cud get your file just like any other ajax request.
Using javascript
var request = new XMLHttpRequest();
request.open('GET', 'public_path_to_file.txt', false);
request.send();
var textFileContent = request.responseText
Using jQuery
var textFileContent;
$.get('public_path_to_file.txt', function(data) {
textFileContent = data;
});
Whats left is to get the right part from textFileContent. Dependent of the structure of the file we can do this in different ways. Without an example file you are on your own but here is some examples.
If you need the last line
var lines = textFileContent.split("\n");
var lastLine = lines[lines.length - 1];
If you need to use regex
var regex = //* some regex to get your content*//gm;
var result = regex.exec(textFileContent);
// result should now the content who matches your regex
First I'll assume that you ultimately want to read a local file with your browser and your current workflow is something like a local 'bash-script' that
first updates/modifies an inline piece of javascript (inside a locally stored html
file) with the last occurring value retrieved from a local txt-file (using sed)
opens the (just modified html-) file (via commandline) inside a common browser.
Then I assume the sed-route once worked but now doesn't work anymore (probably because the html file has changed?) and now you'd like the inline javascript (in the html file) to fetch that value from the textfile itself and subsequently use it (thus without the need for the 'bash-script'/sed solution.
Thus, the answer (based on above assumptions) to your final question: 'is there any javascript code that takes that file, extracts the last value and simply displays it on the right place of the code?', depends on your final requirement:
are you ok with a file-input where you select the text-file every time you view the html-file?
If your answer is YES, then, (depending on the browser you use) you can read a local file (and work your magic on it's contents).
In modern browsers, using the File API (which was added to the DOM in HTML5) it's now possible for web content to ask the user to select local files, then read the contents of those files.
For example, using FireFox's 'FileReader' you could do:
html:
<input type="file" id="fileinput" multiple />
javascript:
function readAllFiles(evt){
var files = evt.target.files, i = 0, r, f;
if(files){
for(; f = files[i++]; ){
r = new FileReader();
r.onload = (function(f){
return function(e){
alert(e.target.result);
};
})(f);
r.readAsText(f);
}
} else {
alert("Error loading files");
}
}
document.getElementById('fileinput')
.addEventListener('change', readAllFiles, false);
Note that for accessing local files in Chrome you must start Chrome with this switch: chrome --disable-web-security
However,
if the answer is NO (so you want to specify the file, and more importantly it's path, inside the 'code', so you don't have to select the text-file every time your local app runs) then you (usually) can't (because you can't get/set the path, thank the great maker)...
Unless you choose a specific older/unpatched browser (specifically for this task) where you know of a (hack) way to do this anyway (like the IE xml vulnerability or the XMLHTTP vulnerability or etc... you get the picture..).
Some alternative solutions (that don't require you to select the correct textfile over and over again)
Setup a fullblown web (LAMP) server (to use the XMLHttpRequest way as used in aross answer, but this might feel like shooting at a mosquito with a cannon..)
Explore different script languages (but effectively still do the same as your now broken sed-solution)
Combine 1 and 2, choosing from php (the latest version has a small webserver included, you might start/stop it when needed (even in the bash-script workflow) OR using node.js (which is 'javascript' and where you can program/control a small task-specific server in just a couple of lines).
Hope this helps!
Update:
Based on your updated question, comments and request for recommendation, I'd like to suggest to use PHP to dynamically fetch the value from your log txt file and have it generate your html code with inline javascript on the fly (every time you visit the page).
The browser will never see the php code, only what php inserted to your page (in this example the last found value or 0).
You'd rename the rightnow.html file to rightnow.php and modify it (something like) this:
<!DOCTYPE html>
<html><head>
<!-- your header code -->
<script type="text/javascript">
//parts of your javascript
<?php // start php script
$logFile= '/pathToYour/logFile.log'; // <-Modify
if( $fp= #fopen($logFile, "r") ){ // if logfile succesfully opened,
fseek($fp, -30, SEEK_END); // set pointer 30 chars from EOF
$val= array_pop(explode("-", rtrim(fread($fp, 30)))); //get last value
fclose($fp); // close file
}
?> // end php script
function drawChart(){
var data=google.visualization
.arrayToDataTable([ ['Label', 'Value'],
['Temp', <?php echo $val? $val : "0"; ?>],
]); // ^php above inserts value or 0
// etc...
}
//parts of your javascript
</script>
</head><body>
<!-- your body code -->
</body></html>
Note that fopen in combination with setting the filepointer via fseek and sequentially fread-ing from the pointer to EOF does not load the complete logfile (60min * 24hour=1440 lines of 16 bytes=22.5kB at the end of the day) into memory (good for this purpose), but only the last 30 chars (as in this example).
The variable to your logfile and path must still be modified to your situation (I don't know the format of your $today variable).
Depending on your further needs you might want to perform some extra checks/logic on the array of values that explode returns (instead of popping the last value). Or what about modifying the html a little so you could also include the last temperature's time reading, etc. (But this tested piece of code should get you started and explains the procedure of going the php way).
Update:
Since you have chosen to place the last known value of your logfile as in textfile placed inside your public www-root (with a bash script I assume, every minute of the day?), you can now indeed go the 'ajax' way, as answered by aross!
However I want to hint that the code/solutions in all current answers here could be mixed (since you now also have ajax working): instead of ajax-ing (loading) a txt file, you could have php fetch and send this value to the browser on-the-fly/on-demand!
So, instead of requesting http://url_to_my_rpi/file_to_download.txt, you could request http://url_to_my_rpi/read_last_temperature.PHP which should fetch the last known value out of the log-file (set proper security/access) and send it to the browser (set proper headers), just like your text-file did. You wouldn't have to change anything in the html/javascript except the url you request.
The advantage would be (depending on how your current bash-scripts works) that your PI now only does this 'work' (of getting the last value of your logfile) when you are viewing your monitor-page. And that you are not writing that file in your www-root every minute of every day (as I suspect).
The solution achieved, finally, was like this:
I did it with a jQuery statement and reusing the javascript code of Google Charts.
First I added javascript and jQuery tags in the html file:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type='text/javascript' src='https://www.google.com/jsapi'></script>
Then I merged jquery code and javascript code that I had in one script:
<script type='text/javascript'>
// Needed this var so that I could use it in other places of the code
var t;
jQuery.get('http://url_to_my_rpi/file_to_download.txt',function(data){
console.log(data)
t=data;
},'text');
google.load('visualization', '1', {packages:['gauge']});
google.setOnLoadCallback(drawChart);
function drawChart() {
t=eval(t);
var data = google.visualization.arrayToDataTable([
['Label', 'Value'],
['Temp', t],]);
// (... more javascript with Google Charts options, display parameters..)
</script>
Finally, and even if it's not listed as the main question, be sure to enable *mod_headers* on your apache and add Header set to apache2.conf file (In my case: /etc/apache2/apache2.conf)
1) Enable the module:
a2enmod headers
2) Add the line on your configuration file
Header set Access-Control-Allow-Origin "*"
3) Restart apache 2
4) In case the 3 steps above didn't work, follow the instrcutions by entering in this website or reinstall apache2.
When I'm using controller function with parameters the rendered view just seems to forget every included .js files.
public function view($id = null) {
if(!$id) {
throw new NotFoundException(__('Invalid post'));
}
$post = $this->Post->findById($id);
if(!$post) {
throw new NotFoundException(__('Invalid post'));
}
$this->set('post', $post);
}
If I take parameters away and put variable '$id = 1' on function the view with postID 1 renders okay in 'posts/view'.
I included javascript files to default.ctp in traditional way:
echo "script type='text/javascript' SRC='../js/jquery-1.9.1.min.js'></script>";);
(it includes '<' but this text editor won't me type it for safety reasons I guess)
I don't have knowledge about 'js helpers' of cakePHP. Can't I use javascript in traditional way?
Site renders okay in every other view (e.g. posts/add) and .js files are included in source code of 'posts/view/1'
The problem
You're using relative paths to the javascript;
<script src='../js/jquery-1.9.1.min.js'></script>
In this url, ../ means '1 directory up from the current location`, so when you're currently visiting this URL;
http://mysite.com/home/
Then your browser will correctly try to load the script from;
http://mysite.com/js/jquery-1.9.1.min.js
However, if you're visiting this url;
http://mysite.com/home/and/some/more/
Then the browser will look for the JavaScript here:
http://mysite.com/home/and/some/js/jquery-1.9.1.min.js
How to fix the problem
Use absolute paths for all 'assets' (CSS, JavaScript, Images);
src='/js/jquery-1.9.1.min.js'
Output the script-tags using CakePHP Helpers (after all, that's what they are meant for: to simplify your work :), e.g. echo $this->Html->script('jquery-1.9.1.min');
CSS and Javascript files don't change very often, so I want them to be cached by the web browser. But I also want the web browser to see changes made to these files without requiring the user to clear their browser cache. Also want a solution that works well with a version control system such as Subversion.
Some solutions I have seen involve adding a version number to the end of the file in the form of a query string.
Could use the SVN revision number to automate this for you: ASP.NET Display SVN Revision Number
Can you specify how you include the Revision variable of another file? That is in the HTML file I can include the Revision number in the URL to the CSS or Javascript file.
In the Subversion book it says about Revision: "This keyword describes the last known revision in which this file changed in the repository".
Firefox also allows pressing CTRL+R to reload everything on a particular page.
To clarify I am looking for solutions that don't require the user to do anything on their part.
I found that if you append the last modified timestamp of the file onto the end of the URL the browser will request the files when it is modified. For example in PHP:
function urlmtime($url) {
$parsed_url = parse_url($url);
$path = $parsed_url['path'];
if ($path[0] == "/") {
$filename = $_SERVER['DOCUMENT_ROOT'] . "/" . $path;
} else {
$filename = $path;
}
if (!file_exists($filename)) {
// If not a file then use the current time
$lastModified = date('YmdHis');
} else {
$lastModified = date('YmdHis', filemtime($filename));
}
if (strpos($url, '?') === false) {
$url .= '?ts=' . $lastModified;
} else {
$url .= '&ts=' . $lastModified;
}
return $url;
}
function include_css($css_url, $media='all') {
// According to Yahoo, using link allows for progressive
// rendering in IE where as #import url($css_url) does not
echo '<link rel="stylesheet" type="text/css" media="' .
$media . '" href="' . urlmtime($css_url) . '">'."\n";
}
function include_javascript($javascript_url) {
echo '<script type="text/javascript" src="' . urlmtime($javascript_url) .
'"></script>'."\n";
}
Some solutions I have seen involve adding a version number to the end of the file in the form of a query string.
<script type="text/javascript" src="funkycode.js?v1">
You could use the SVN revision number to automate this for you by including the word LastChangedRevision in your html file after where v1 appears above. You must also setup your repository to do this.
I hope this further clarifies my answer?
Firefox also allows pressing CTRL + R to reload everything on a particular page.
In my opinion, it is better to make the version number part of the file itself e.g. myscript.1.2.3.js. You can set your webserver to cache this file forever, and just add a new js file when you have a new version.
When you release a new version of your CSS or JS libraries, cause the following to occur:
modify the filename to include a unique version string
modify the HTML files which reference the library to point at the versioned file
(this is usually a pretty simple matter for a release script)
Now you can set the Expires for the CSS/JS to be years in the future. Whenever you change the content, if the referencing HTML points to a new URI, browsers will no longer use the old cached copy.
This causes the caching behavior you want without requiring anything of the user.
I was also wondering how to do this, when I found grom's answer. Thanks for the code.
I struggled with understanding how the code was supposed to be used. (I don't use a version control system.) In summary, you include the timestamp (ts) when you call the stylesheet. You're not planning on changing the stylesheet often:
<?php
include ('grom_file.php');
// timestamp on the filename has to be updated manually
include_css('_stylesheets/style.css?ts=20080912162813', 'all');
?>