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];
}
Related
Im using pdfobject along with forcePDFJS which uses pdfjs viewer.js to render pdf's.. Once they are rendered I need to be able to jump to pages without reloading the document.. The documents can be pretty large
I've seen some mentions about using PDFApplicationViewer.pdfview.currentPageNumber. but I haven't seen a good example on how to use it correclty
I've seen two example of using the PDFApplicationViewer
1. PDFApplicationViewer.pdfview.currentPageNumber = pagNum;
2. document.getElementById('mycanvas').contentWindow.PDFApplicationViewer.pdfview.currentPageNumber = pagNum;
Althought the second on make more sense Im not sure where the contentWindow object from the element comes from. Im assuming the pdfobject embeds something that I could get access too but I can't figure it out..
Also, since I couldn't really find alot on this.. Is this even possible..
For time constraint reasons I don't want to have to put together a new viewer using pdfjs.. I like what comes with the viewer.html.. I just need to jump the pages without reloading
PDFObject.embed doesn't return any reference So I looked into the pdfObject code to see how it was embedding the pdf..
for this to work there needs to be a iframe.. So when rendering with pdfobject Im using a configureation as follows:
Notice forcePDFJS=true
if(!pageNum)
pageNum=1;
var options = {
pdfOpenParams: {
view: "FitV",
page: pageNum
},
forcePDFJS: true,
PDFJS_URL: "../pdfjs/web/viewer.html"
};
Here is code that works
var pdfviewer = document.getElementById('pdfviewer');//get the viewer element
var contenttag = pdfviewer.getElementsByTagName("iframe")[0]//got this from pdfobject code
contenttag.contentWindow.PDFViewerApplication.pdfViewer.currentPageNumber = parseInt(pageNum);//change the page
In my case, the pdfviewer id is not available anymore.
PDFObject does return the reference of iframe that it creates. I was using basic HTML + JS so I had to save that reference to global window object to be able to access it from anywhere in the project.
Finally, with the reference we have, we can access the PDFViewerApplication object as below and manipulate the PDF:
I'm building a scraper with phantom/casper.
At this point, I need to extract a URL that appears in the page only inside a js script.
Example of the page source code :
<script>
queueRequest('URL.aspx?var1='+VAR1+'&var2='+VAR2, getPageMenu');
</script>
I have no problem evaluating VAR1 and VAR2, as they are in the page context, but I need URL, which is hardcoded and has no reference to it. URL is of course different according to the page I'm on and I have no way of guessing it. Any ideas?
My ideas :
As the URL is called on page load to fill a div wih AJAX, I was thinking of maybe capturing the XHR request, but I don't know how.
I managed to get the script elem I need, using document.getElementsByTagName('script'). That may be one way to go, but how do I get only the line I need out of 200+ lines? (the one starting with queueRequest)
SO to make my question clear :
Which idea is better, 1 or 2?
if 1 : How do I capture the request URL with casper?
if 2 : How do I get the right line in my script?
If you want to search your script blocks, you can try something like this:
found = null;
scripts = document.getElementsByTagName('script');
for (i = 0; i < scripts.length; i++)
{
matches = /queueRequest\('(.+)\?/.exec(scripts[i].innerText)
if (matches)
{
found = matches[1];
break;
}
}
alert(found);
There might be tighter ways to implement the same thing but the regex is roughly what you're after. Note that this will only get you the URL part of the first appearance of queueRequest('something.something?...) in embedded script blocks.
Ok so another issue i got
I have a js file that i need to include on my page (i dont have access to edit this js file)
Inside that javascript there is a function wich has a line that i need to edit a variable in there.
lets assume:
Code:
var links = [{"offer_id":"1","title":"Text!","url":"http:\/\/www.site.com\/tracker\/1\/?http:\/\/site.com\/click.php?aff=9917&camp=5626&crt=13346&sid=e6a00014f247fe39de1b_1","footer_text":"text","blank_referrer":"1","active":"1","value":"0.40","creation_time":"1327785202"}];
notice : '&sid=e6a00014f247fe39de1b_1'
i need to add something right after sid=
so that i becomes for example:
Code:
&sid=AlssfIT_e6a00014f247fe39de1b_1
i added: AlssfIT_
any ideas how to achieve this ?
i tried something like
Code:
str.replace("&sid=","&sid="+kwd);
right after i "include" the js file but aparently is not working
I think you're going about it the wrong way. If notice is a variable in the global space you can just replace it normally.
window.someObject.notice = window.someObject.notice.replace("&sid=","&sid="+kwd);
This will of course only work if notice is a variable that is navigable to in the global namespace and is not inside a closure. It is inside a closure if it has a var declaration inside a function() {...}
But, assuming that there is global access to that variable, that will be your easiest way to achieve this.
If not, you can try grabbing the contents of the script and executing it hopefully overwriting the original code. This will only work if your script and the script you are fetching are from the same origin (domain, subdomain, port, protocol, a few other things) - it is impossible otherwise due to the _Same Origin Policy_
Assuming you are at the same origin, you could do something like this (using jquery for simplicity)
( function() {
// First we need the url of the script, we can grab it out of the element directly or it can be hard coded
var scriptLocation = $('script#the-id-of-the-script-element').prop('src');
// Now that we have the location fetch the script again so we can get it as plaintext
// this will usually not do another HTTP request since your browser has it cached
$.get(scriptLocation).done(function(text) { // I prefer the deferred syntax as being more explicit, this is equivalent to $.get(scriptLocation, function(text) {
var newText = text.replace("&sid=","&sid="+kwd);
eval(newText);
});
} )()
Something like this could work.
try regex: (not tested)
myregexp = new RegExp("/&sid=/", "gims");
str.replace(myregexp, "&sid=" + kwd);
I was looking at FireBug Lite and saw that they use a pretty cool technique to pass options into an external script file:
<script type="text/javascript" src="https://getfirebug.com/firebug-lite.js">
{
overrideConsole: false,
startInNewWindow: true,
startOpened: true,
enableTrace: true
}
</script>
What is the name of this technique and how does it work?
It's not an automatic variable-passing-technique as you may think.
All their code does is loop through all the script tags until they find the one which loaded their code (by comparing the src attribute to a regular expression (/(firebug-lite(?:-\w+)?(?:\.js|\.jgz))(?:#(.+))?$/;).
If it finds the tag, it simply gets the .innerHTML of the script tag, and evaluates it.
I guess this (unnamed) techique isn't relevant in the real-world, as we don't have a guaranteed method of finding which script tag refers to our library (especially as it is common for all script's to be combined into one script file on live servers).
Furthermore, I have my doubts over how cross-browser this is; as it certainly doesn't go by the spec, which states:
Having said that (and thought about it): the spec states that the browser shouldn't interpret both. However this isn't relevant with this technique. The browser doesn't have to interpet both, as the content of the script is read in through innerHTML (and even if it did read in the content, it doesn't do any harm anyway). Aslong as the browser conforms to the spec, and loads the URI (which all browsers do), there's no problem! (apart from not knowing/ guaranteeing which script tag your library belongs to).
The script may be defined within the
contents of the SCRIPT element or in
an external file. If the src attribute
is not set, user agents must interpret
the contents of the element as the
script. If the src has a URI value,
user agents must ignore the element's
contents and retrieve the script via
the URI.
(i.e., don't interpret both).
Further to #Matt's answer, and to clarify my comment:
var doc = Firebug.browser.document;
var script = doc.getElementsByTagName("script")[index];
var url = getScriptURL(script);
var isExternal = url && url != doc.location.href;
try
{
if(isExternal)
{
Ajax.request({url:url, onSuccess:renderProcess, onFailure:onFailure})
}
else
{
var src = script.innerHTML;
renderProcess(src)
}
}
catch(e)
{
onFailure()
}
I am loading a script using the script embed tag and I want to get the url variables and the loading script name inside the script. Is it possible? For Example,
<script src="test.js?id=12"></script>
Inside test.js is there any way to get the url variable id?
Any help would be appreciated.
Thanks,
Karthik
Aside from the answers in the linked post, FWIW with Firefox 4 only you can (with caveats); document.currentScript.src which will return the full url, including arguments.
Thanks for all your efforts I have made that working by assigning an id attribute in the script tag and accessed via jQuery,
<script src="test.js?id=12" id="myScript"></script>
var currentScript = $("#myScript").attr('src'); //This will give me my script src
Thanks,
Karthik
If you want to get a variable from the current URL you can use this:
function queryParser(url){
this.get=function(p){return this.q[p];}
this.q={};
this.map=function(url){
url=url || window.location.search.substring(1);
var url=url.split('&');
var part;
for(var i=0;i<url.length;i++){
part=url[i].split('=');
this.q[part[0]]=part[1];
}
}
this.map(url);
}
var query=new queryParser();
// assuming you have ?test=something
alert(query.get('test'));
I recommend you map the result, so you don't re-parse whenever you want to find a specific element.
I don't really know why you'd pass a query string in a script tag like that, unless you specifically want off-site includes with a simple robust system for various effects. Or are actually using PHP to handle that request.
If you want to "send" a variable to one of your scripts, you can always do:
<script type="text/javascript">
var myVar="I'm in global scope, all scripts can access me";
</script>
<script src="test.js?id=12"></script>
If you really need to get the URL of the currently included script, you can use the code supplied by my peers in the other answers, you can then use:
var query=new queryParser(scriptURL);
alert(query.get('id'));// would alert 12 in your case
Navigating through the link on your comments you can get the proper answer.
Anyway, to make things easier:
var allScripts=document.getElementsByTagName('script');
var indexLastScript= allScripts.length -1;
alert (allScripts[indexLastScript].src);
This will show up "test.js?id=12" as a regular String so its up to you to split it in order to get de param.
Hope it helps, I've tried it on the run over the Chrome Javascript Console. :D.