I have been playing around with HTML5 and Javascript for the first time and I am stuck. My question in short is how do I call a method (in html) inside a JS file which starts with
$(function() { ... }
Basically I used azure which gives you a code project to start but when it gave me the files there was a page.js which started with:
$(function() {
var client = new WindowsAzure.MobileServiceClient('[...]', '[...]'),
todoItemTable = client.getTable('todoitem');
...
The azure service has a very simple database which I need to use to create a Kanban boardesc webpage.
I made my task element draggable and added events to handle it but I am unable to create the event method in this JS file and if I have it in my HTML I am unable to call any of the methods in the .js
I have asked around work and no one seems to have seen the $(function() { ... } thing before and I can't find the info that I need anywhere.
Thanks
You do not call this method directly; the syntax you're looking at is JQuery's document.ready in other words this function gets called when your document is finished loading.
JQuery Link - Document.Ready
That is the jQuery shorthand for the $(document).ready(handler) function. Anything you put in the function will be executed when the document is finished loading.
jQuery ready function
That syntax is jQuery - specifically an an alias of the "DOMReady" function
( http://api.jquery.com/ready/ ) which is called after the DOM has finished loading.
Try looking at this question's suggested answer by Derick Bailey.
Why define an anonymous function and pass it jQuery as the argument?
He includes some sample code of how to write a code using a JavaScript Module pattern.
Good luck!
Anthony
Related
I am learning about writing custom JavaScript for my Odoo 10 addons.
I've written the following piece of code:
odoo.define('ioio.io', function(require) {
'use strict'
const e = $('div.o_sub_menu_footer')
console.log('--testing--'.repeat(7))
console.log(e)
// the "Powered by Odoo" down the secondary menu
e.remove()
})
The code is well loaded and I can see my testing string in the console.
However when this code is being loaded before the target div, so e empty/not yet filled and thus its content is not removed.
Doing it manually from the console works.
My question is what is the right way to do that? And how to know exactly when the code gets executed?
You can
put your html code before the script tag in your file
use jQuery $(document).ready(...);
Place your script at the bottom of the <body> tag to make sure the DOM renders before trying to manipulate it.
This is an Odoo specific question, so you should use the Odoo standard way, which is via its base JS class. That class contains a ready() method which does exactly what you need.
In your case, to use that function, you need to require the class first. Then you can use ready().
Updating your code, it should look like this:
odoo.define('ioio.io', function(require) {
'use strict'
// require base class
var base = require('web_editor.base');
//use its ready method
base.ready().done(function () {
// put all the code you want to get loaded
// once the DOM is loaded within this block
const e = $('div.o_sub_menu_footer')
console.log('--testing--'.repeat(7))
console.log(e)
// the "Powered by Odoo" down the secondary menu
e.remove()
});
})
While your accepted answer leads to the same outcome, you might want to update it to this one since this is the Odoo way. It's generally advised to work within the Odoo framework as much as possible and customise only if really needed. (Though it can be tough to learn what features Odoo already provides because of its poor documentation.)
I'm using the Adobe Accessible Mega Menu plugin and am looking to extend this, (basically add a function that can be called from another script).
I've looked into extending jquery plugins, javascript closures and various other threads on the subject and I can see how this works
I can also see a bunch of public attributes and methods (ln 695 on) however attempting to call these merely returns the jquery object?
Equally adding a function and attempting to call that doesn't seem to work?
I've added a function called testFunction which fires an alert and should (i think) be called :
$("nav:first").accessibleMegaMenu("testFunction");
but no luck far..
Does anyone know how I can add a function to the above script, that can be called from another script?
https://codepen.io/anon/pen/VjzkqE
edit: solved - functions need to be accessed through the prototype obj as in :
nav.accessibleMegaMenu.AccessibleMegaMenu.prototype.customFunction(param);
I have implemented this approach on a project by using extend function from jquery and prototype to extend infinitescroll plugin you can take this approach and implement it to your plugin I hope this would be useful for you as well
$.extend($.infinitescroll.prototype, {
fucntion1: function() {
//function implementation
},
fucntion2: function() {
//function implementaion
}
});
take a look for the question Best Way to Extend a jQuery Plugin
So I'm using timeago plugin in my Rails 3 app, wrapping it within this function (note than the timeout just keeps the timeago strings updated to the minute at every moment):
function doTimeago() {
$('.timeago').each(function() {
var $this = $(this);
if ($this.data('active')!='yes') {
$this.timeago().data('active','yes');
}
});
}
And then in my application.js
$(function() {
doTimeago();
}
This works great until I load some elements using remote calls. I researched a bit and found no working solution. I'm not happy adding livequery plugin as suggested in this question since it seems deprecated.
I was thinking of adding this JS code to the end of every js.erb file in my app, but it feels really duplicated and nasty.
doTimeago();
Question part 1: ¿Is there an easy way to inject that code after every js.erb execution?
Question part 2: ¿How do I achieve my primary goal of having ajaxy loaded elements work with timeago?
You can bind it to ajaxComplete event, like this:
$(document).on('ajaxComplete', function(){
do_timeago();
});
BTW, I didn't understand your timeout in do_timeago function. Also, JS best practices are a bit different than ruby ones, consider rename your function to something like doTimeago.
Hope it helps.
Suppose we need to embed a widget in third party page. This widget might use jquery for instance so widget carries a jquery library with itself.
Suppose third party page also uses jquery but a different version.
How to prevent clash between them when embedding widgets? jquery.noConflict is not an option because it's required to call this method for the first jquery library which is loaded in the page and this means that third party website should call it. The idea is that third party site should not amend or do anything aside putting tag with a src to the widget in order to use it.
Also this is not the problem with jquery in particular - google closure library (even compiled) might be taken as an example.
What solutions are exist to isolate different javascript libraries aside from obvious iframe?
Maybe loading javascript as string and then eval (by using Function('code to eval'), not the eval('code to eval')) it in anonymous function might do the trick?
Actually, I think jQuery.noConflict is precisely what you want to use. If I understand its implementation correctly, your code should look like this:
(function () {
var my$;
// your copy of the minified jQuery source
my$ = jQuery.noConflict(true);
// your widget code, which should use my$ instead of $
}());
The call to noConflict will restore the global jQuery and $ objects to their former values.
Function(...) makes an eval inside your function, it isn't any better.
Why not use the iframe they provide a default sandboxing for third party content.
And for friendly ones you can share text data, between them and your page, using parent.postMessage for modern browser or the window.name hack for the olders.
I built a library to solve this very problem. I am not sure if it will help you of course, because the code still has to be aware of the problem and use the library in the first place, so it will help only if you are able to change your code to use the library.
The library in question is called Packages JS and can be downloaded and used for free as it is Open Source under a Creative Commons license.
It basically works by packaging code inside functions. From those functions you export those objects you want to expose to other packages. In the consumer packages you import these objects into your local namespace. It doesn't matter if someone else or indeed even you yourself use the same name multiple times because you can resolve the ambiguity.
Here is an example:
(file example/greeting.js)
Package("example.greeting", function() {
// Create a function hello...
function hello() {
return "Hello world!";
};
// ...then export it for use by other packages
Export(hello);
// You need to supply a name for anonymous functions...
Export("goodbye", function() {
return "Goodbye cruel world!";
});
});
(file example/ambiguity.js)
Package("example.ambiguity", function() {
// functions hello and goodbye are also in example.greeting, making it ambiguous which
// one is intended when using the unqualified name.
function hello() {
return "Hello ambiguity!";
};
function goodbye() {
return "Goodbye ambiguity!";
};
// export for use by other packages
Export(hello);
Export(goodbye);
});
(file example/ambiguitytest.js)
Package("example.ambiguitytest", ["example.ambiguity", "example.greeting"], function(hello, log) {
// Which hello did we get? The one from example.ambiguity or from example.greeting?
log().info(hello());
// We will get the first one found, so the one from example.ambiguity in this case.
// Use fully qualified names to resolve any ambiguities.
var goodbye1 = Import("example.greeting.goodbye");
var goodbye2 = Import("example.ambiguity.goodbye");
log().info(goodbye1());
log().info(goodbye2());
});
example/ambiguitytest.js uses two libraries that both export a function goodbye, but it can explicitly import the correct ones and assign them to local aliases to disambiguate between them.
To use jQuery in this way would mean 'packaging' jQuery by wrapping it's code in a call to Package and Exporting the objects that it now exposes to the global scope. It means changing the library a bit which may not be what you want but alas there is no way around that that I can see without resorting to iframes.
I am planning on including 'packaged' versions of popular libraries along in the download and jQuery is definitely on the list, but at the moment I only have a packaged version of Sizzle, jQuery's selector engine.
Instead of looking for methods like no conflict, you can very well call full URL of the Google API on jQuery so that it can work in the application.
<script src="myjquery.min.js"></script>
<script>window.myjQuery = window.jQuery.noConflict();</script>
...
<script src='...'></script> //another widget using an old versioned jquery
<script>
(function($){
//...
//now you can access your own jquery here, without conflict
})(window.myjQuery);
delete window.myjQuery;
</script>
Most important points:
call jQuery.noConflict() method IMMEDIATELY AFTER your own jquery and related plugins tags
store the result jquery to a global variable, with a name that has little chance to conflict or confuse
load your widget using the old versioned jquery;
followed up is your logic codes. using a closure to obtain a private $ for convience. The private $ will not conflict with other jquerys.
You'd better not forget to delete the global temp var.
I'm trying to integrate a javascript library for drag&drop on tables into one page of my custom Drupal module. I've included the js file using drupal_add_js, but I don't know how to initialize it.
The documentation for that library states that an init function should be called like
<body onload="REDIPS.drag.init()">
How would I do that in Drupal? Or has Drupal some better way of initializing the script?
Drupal has its own mechanism for this, involving adding a property to Drupal.behaviors. See this page: http://drupal.org/node/205296
Drupal.behaviors.redipsDragBehavior = function() {
REDIPS.drag.init();
};
From the linked page:
Any function defined as a property of
Drupal.behaviors will get called when
the DOM has loaded.
You could try adding another drupal_add_js call in the same function as your other add_js:
drupal_add_js('REDIPS.drag.init();','inline','header',true);
The last param "true" is to defer the execution of the script.
I hope that helps in some way!