I'm trying to modify a variable - which is created in javascript - and run a function to change some visual stuff on a page. But my greasemonkey script is - i guess - running before the javascript, i'm getting an error says function is not defined.
How can I force to run my script after the javascript runs?
Actually what I'm trying to do is very simple. There is a variable called cursort, what I want to do is change that to "data-price" and sort the list again using updateSort(). Here is the code:
var cursort = "data-price";
updateSort();
I had to do something similar, there was a object defined at the end of the page that I wanted to just cancel out, so it's functions wouldn't run (it captured link clicks and ran some stuff).
In the page it was defined like this:
var someObj = { ... }
I made a greasemonkey script (after much trial/error) that looked like this.
window.addEventListener ("load", runAfter, false);
function runAfter() {
unsafeWindow.someObj = null;
}
Now clicking on the links does not trigger all the other actions that were in someObj.
Maybe you can do something like that?
Related
So here' s the piece of code. I'm very new to JavaScript so don't be afraid to explain the obvious
$(".my-css-class").on("click", function() {
($(this).attr("data-property-1"), $(this).attr("data-property-2"), this);
});
There's an element in the .jsp page that looks like this:
<i class="clickMe"></i>
I know the .jsp creates a link-icon, and that the above JavaScript is an event handler. I know that it passes these 3 values as arguments another JavaScript method:
function doStuff(prop1, prop2, obj) {
if (prop1 == 'foo') {
//do stuff with prop2
}
else{
// do stuff with obj
}
}
It all works fine. What I want to know is what exactly is going on to make it work? I can't find anything in the code that connects what the event-handler returns to the 'doStuff' java-script function.
The names are totally different, so it's not reflection, it can't be parameter matching because there's other functions with the same number and type of parameters in the file, it can't be convention based because it still works if I find/replace the name of the function to gibberish.
I guess basically I'm asking what this line is doing:
($(this).attr("data-property-1"), $(this).attr("data-property-2"), this);
tl;dr: I'm at a loss, I know how the properties get as far as the onClick event-handler's anonymous function - but how does JavaScript know to pass them as arguments the to the doStuff() function?
the onClick event is a standard event triggered on click of any clickable html element and is automatically raised by the DOM.
You are hooking in to this by listening on any matched ".my-css-class" elements for an onClick Event.
The jquery syntax ".on" has been simplified over time and allows you to hook into any number of events like "submit" - OnSubmit event , or "load" - onLoad Event
Wherever your on("click", myFunction) event hook is picked up, your myFunction will execute.
Looking at your second point...
because it still works if I find/replace the name of the function to gibberish.
The DoStuff function will be found and replaced across all files in your site? or page? or open tabs? , so therefore it must exist somewhere as "doStuff(" or "giberish(".
so when you do a global find/replace, do each one slowly, until you locate it.
Finally, when you do a view source in the browser, this should either explicitly show you the doStuff function, or at the very least give you a clue as to satelite files loaded at runtime, where you can go and investigate.
Use firebug in firefox to debug loaded resources; the ".net tab" to view external loaded resources and the html/javascript they might contain. (for example: your master page might be loading in an embeded resource that contains the doStuff method, becuase of a user or server control reference in that master page)
Also have a look at this:
http://www.developerfusion.com/article/139949/debugging-javascript-with-firebug/
You can step through the javascipt piece by peice until it hits the doStuff method.
Just remember to set at least 1 breakpoint ;-)
I am currently building a website that uses windows to load in new content via ajax. These windows are allowed to contain the same page as in another window using the same javascript. Currently I assign a unique id to the new window which it then stores for later use.
Once the code is loaded in, all the ids in that window are converted by adding on to them a unique_id. ie "box" becomes "box_win1". I then send this id to the javascript by assigning it to a variable so it can be used in document.ready function.
The pseudo code for the window is like the following:
document.ready{
var temp_id=id+1;
$("#mybox" + temp_id).val("abc")
//run some startup stuff
}
I am just wondering is there a better way to do this. As I find if I open to many new windows all at once the temp_id conflicts and goes to the wrong window.
I would like to some how create an instance of the code but I am not sure how. I cannot use global functions however as that may cause naming conflicts.
put this into a function
function callMe (){
var temp_id=id+1;
$("#mybox" + temp_id).val("abc")
//run some startup stuff
}
you can use callMe() anywhere then
I'm trying to test a page using CasperJS, in particular I want to poke the data model a bunch. Let's say I've got a basic function called taxes, and I want to ensure that it uses the right tax rate. So I'd like something like:
this.test.assert(taxes(100, 'Ontario') === 15, "Check ontario tax rate");
Rather than filling out a form and seeing what it prints. That taxes method exists in the global scope, so I'm able to execute it quite easily from anywhere (including from the console in firebug or Chrome). But it's not in the right scope for that to work inside CasperJS (I think? I'm getting ReferenceError: Can't find variable: taxes.
It seems like I'm missing something simple.
TL;DR: How do I execute an on-page bit of JS directly inside a CasperJS test?
Have you tried using evaluate()?
relevant quote: "execute code as if you were using the browser console."
something along the lines of:
casper.evaluate(function(amount, province) {
return taxes(amount, province);
}, {100, 'Ontario'});
Use assertEvalEquals() method.
If you're calling the method via a jQuery-style reference, make sure to explicitly include the library, lest you'll get the ReferenceError:
var casper = require('casper').create({
clientScripts: ['js/jquery-1.7.2.js']
});
...
casper.start('foo.php',
function() {
console.log(this.evaluate(function() {
return $('taxes').text();
}));
});
casper.run();
See: https://groups.google.com/forum/#!msg/casperjs/2uyUOqdzShw/bHWrJYXni40J
If you're calling it implicitly in the global scope (i.e., straight javascript, rather than, for example, $('taxes')), you might have to explicitly prepend the window or document namespace to the reference:
document.querySelector('#taxes').value = taxes_text;
I need a way to load a website - something like gBrowser.loadURI, window.location or window.open - but I need to execute some more code AFTER that website has been loaded (and parsed by the browser). The functions I've mentioned don't block execution of my code until the site is fully loaded, but only until it has started loading.
In case it matters: This code will not be part of my/a website, but will be a FireGestures script.
https://developer.mozilla.org/en/Code_snippets/Tabbed_browser#Manipulating_content_of_a_new_tab seems to be what you want. They suggest:
var newTabBrowser = gBrowser.getBrowserForTab(gBrowser.addTab("http://www.google.com/"));
newTabBrowser.addEventListener("load", function () {
// use newTabBrowser.contentDocument to manipulate DOM
// or do whatever you want on-load
}, true);
See also docs for tabbrowser and browser.
I know that for safety reasons that this is not easy to achieve, however there would be a way to do so as firebug does...
Please help, would like to invoke some script in the page's context to achieve some effect...
Basically, I would like to achieve two functionality:
1. add jQuery to any web page automatically if not already exist.
2. when open certain address, call a method of that page to auto notify the server. (an ajax functionality of the page)
I have tried to inject on the body, no luck.
tried to get the window object, which however do not have access to call the function.
Will try to change the location to something like: javascript:alert('test inject');
Many thx.
OK, after reading some official documentation and the GreaseMonkey's source, I get the following method which basically works for me.
Hope it will save sb's hour:
var appcontent = document.getElementById("appcontent"); // browser
if (appcontent) {
appcontent.addEventListener("DOMContentLoaded", function (evnt) {
var doc = evnt.originalTarget;
var win = doc.defaultView;
var unsafeWin = win.wrappedJSObject;
// vote.up is the function on the page's context
// which is take from this site as example
unsafeWin.vote.up(...);
}, true);
}
}
Greasemonkey does that. If you are developing your own extension with similar functionality, you can use Components.utils.evalInSandbox.