Develop Reference

Rails 4 - Layouts only showing half the time with javascript

I made a little script in javascript to display a different image based on the day, it works fine but half the time when I load the page only the image will be displayed and not the rest of the app(no menus) and the other half everything is working perfectly.
I put the JS code in the index.html.erb file since it's really small, should I put it somewhere else or the problem is elsewhere?
EDIT :
I ended up writing it in coffeescript in the .js.coffee file with an "#" in front of the name of the function and tell call it in the view and I still got the same problem.
View file (app/view/module/index.html.erb)
<script type="text/javascript">
#myfunction();
</script>
function : in app/assets/javascripts/module.js.coffee
#day = ->
today = new Date
number = today.getDay() + 1
document.write '<img src="url' + number +'.jpg">'
return

document.write will erase everything in the html before writing to it, that's why you only see the image.
You should do something like this instead:
placeholder = document.getElementById("placeholder")
placeholder.innerHTML = '<img src="url' + number +'.jpg">'
where placeholder is an existing element in the html with id of "placeholder"

You can't use coffescript in a script tag* - sprockets will not convert the coffee script to javascript which the browser can actually run.
If you had checked the browser console you would have seen that # causes a syntax error in javascript.
SyntaxError: Unexpected token ILLEGAL
When javascript hits a syntax error it will stop executing the script.

Cache static HTML pages with get variables

I have a website with a lot of iframes like this:
<iframes src="expamle.com\page.html?var=blabla&id=42" scrolling="no"></iframe>
I have to change var=blabla&id=42 for each iFrame. These parameters are used in the javascript of the iframe. Is there any way to cache(give hints to the browser) page.html (static) once for all variables ?
I have to use an iframe since I want to be able to update this code ( from another server) & to run it in another scope.

No - Anything changing the query string represents a seperate resource for the browser.
However, you may be able to achieve that effect if you can make some slight changes to page.html. If you write it this way:
<iframes src="expamle.com\page.html#var=blabla&id=42" scrolling="no"></iframe>
Note the use of the # character - that's the key there.
The query string becomes simply "page.html" and will cache that way. However, the Javascript of that page will have access to the variable document.location.hash, which will contain "var=blabla&id=42". It'll be written as a single string, but it shouldn't be difficult to parse. Some libraries even use that tag to pass parameters in semi-real-time to iframes for IE6 compatibility.

If it's only used in the javascript but is really only 1 page server side don't use ? But use # it will consider it as the same page but at diferent anchor pounts. So if test.com/#foo is cached then test.col/#bar is too (same page, different anchor points)

You can update the frame URLs from code:
var fr = document.getElementsByTagName('iframe');
var sites = "1.com,2.com".split(",");
for(var x=0;x<fr.length;x++) {
document.getElementsByTagName('iframe')[x].src="http://"+sites[x];
}

read value from txt file in javascript

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.

Relative/Absolute CFC path in Open BlueDragon

I'm trying to migrate an existing ColdFusion codebase from Adobe CF8 to OpenBD. My files include something like this:
/cfc/one.cfc
/cfc/two.cfc
/app/page.cfm
In CF8 I had a mapping from 'cfc' to '/cfc', and in page.cfm I had:
<cfajaxproxy cfc="cfc.one" jsclassname="oneCfc">
<cfajaxproxy cfc="cfc.two" jsclassname="twoCfc">
and then in Javascript I could call the CFC using:
var c = new oneCfc();
...and life was good.
Under Open BD (v2.0.3b) however, I can't seem to call the CFC functions from Javascript. The proxy is declared as before, and I can create the object in Javascript, but when I try to call a function I get the following error in my browser dev tools:
POST http://127.0.0.1:8080/app/cfc/one.cfc 404 (Not Found)
It appears to be using a relative path in Javascript when it tries to call the function, even though it's already got the object created.
The CFC is valid according to OpenBD (I can browse to ./cfc/one.cfc?wsdl, and I can call functions on it using ./cfc/one.cfc?method=getData etc). It doesn't seem to matter whether I have a mapping defined in OpenBD or not.
The one workaround that seems to work is having the CFC in the same function as the calling CFM file, but this isn't a very good solution when I want to reuse the CFC code from many different pages.
Has anyone got CFCs in other directories working under OpenBD?

For future reference: this problem was resolved (more or less) in OpenBD 3.0, released early March 2013.
In 3.0 the code that creates the AJAX proxy .js file was modified to include the lines:
javascript.append( " this.remoteCFC = '" );
javascript.append( CFC.replace('.', '/') );
javascript.append( ".cfc';\r\n" );
While it still does not take into account any server-side mappings, it at least allows you to reference a path that is not a child of the current .cfm page:
<cfajaxproxy cfc=".cfc.one" jsclassname="cfcOne">
(note the leading ., which is replaced with a / by OpenBD. In previous versions of OpenBD this would generate an error)

Is there a way to AutoFormat (Javascript) code in TestComplete?

So similar to ALt-Shift-F in Netbeans, is there a to do this right in the ide in TestComplete? Not sure if this is possible or if anyone can think of a workaround to autoFormat without leaving the TestComplete window.
I'm trying to get the below solution to work with http://jsbeautifier.org/ for javascript / Jscript code in TestComplete.
Thanks

Great question!
There is no built-in function for that. So, we should not expect any solution to be 100% convenient - it is just not a simple task to modify the current script editor contents (if at all possible). So, whatever you do, it will still be some kind of compromise.
In general, the task is three-fold:
Get the current unit code.
Format the code.
Put the code back to the unit.
According to my understanding, items 1 and 3 can be accomplished only by creating a TestComplete plug-in - accessing editors for project nodes is not an easy thing.
UPDATE: silly me! There is a way to access the script editor code - I've updated the below part.
What will help us avoid switching to a different app, are the Script Extensions:
We create a custom Checkpoint in the form of a Script Extension, and install it to TestComplete. As a result, we get a button on the toolbar that we can click to invoke our code.
In the design time action, we call some code that reads the editor contents, then uses external code formatting functionality, and replaces the editor contents with the formatted code.
It would extremely interesting to see the implementations other TestComplete users can suggest! As a start, I am posting a solution that includes using an external web site to format VBScript code (http://www.vbindent.com/). I know that the starter of the post is probably using JScript, but I have not found a JScript formatter yet.
My solution is a simple Script Extension. I can't post a file here, so I will post the code of the two Script Extension files:
Description file:
<!-- Description.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<ScriptExtensionGroup>
<Category Name="Checkpoints">
<ScriptExtension Name="VBScript Code Indent" Author="SmartBear Software" Version="0.1" HomePage="smartbear.com">
<Script Name="VBIndent.js">
<DesignTimeAction Name="Indent Current VBScript Unit" Routine="DesignTimeExecute"/>
</Script>
<Description>
Indents VBScript code in the currently active unit.
</Description>
</ScriptExtension>
</Category>
</ScriptExtensionGroup>
Code file:
// VBIndent.js
function DesignTimeExecute()
{
if (CodeEditor.IsEditorActive)
{
var newCode = IndentVBSCode_Through_VBIndent(CodeEditor.Text);
if (null == newCode)
return;
CodeEditor.Text = newCode;
}
}
function IndentVBSCode_Through_VBIndent(codeToIndent)
{
var URL_VBIndent = "http://www.vbindent.com/?indent";
var httpObj = Sys.OleObject("MSXML2.XMLHTTP");
httpObj.open("POST", URL_VBIndent, false);
httpObj.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
httpObj.send("thecode=" + escape(codeToIndent));
var responseText = httpObj.responseText;
// Extract the indented code from the response
var rx = /<textarea name=\"thecode\".*?>((.*\n)*?)<\/textarea>/;
matches = rx.exec(responseText);
if (null == matches)
{
return null;
}
codeIndented = matches[1];
return codeIndented;
}
After you create these files, and put them to something like "\Bin\Extensions\ScriptExtensions\VBIndent", and click "File | Install Script Extensions | Reload", you will see a new "Indent Current VBScript Unit" item in the custom checkpoints drop-down button on the Tools toolbar. Clicking the element will format the VBScript code in the currently active editor.
So, this is to give a clear idea of what a solution can look like. Better suggestions are welcome! Share your thoughts!

FYI
I've done. Based on your posts.
JSFormat.tcx
https://drive.google.com/uc?export=download&id=0B1x_73bHRc2Jcm8wbTJ2dUpZQTQ
To install the extension copy attached file JSFormat.tcx to C:\Program Files (x86)\SmartBear\TestComplete 10\Bin\Extensions\ScriptExtensions
To use view next image:
https://drive.google.com/uc?export=download&id=0B1x_73bHRc2Jc3RuLXFpTnlCSnc
Regards