We Keep Coding

Django Admin and third party Javascript

I am running django 2.0, which has jquery 2.2.3. I want to utilize this ImageViewer Javascript app https://github.com/s-yadav/ImageViewer with one of my admin pages. I added the js files and css file to the Media class within my ModelAdmin class, and collected all the static files. The files are loaded on the web page. I am following the app's example for Image Mode (http://ignitersworld.com/lab/imageViewer.html)
The page loads, but there is an error in the js console:
imageviewer.js:16 Uncaught TypeError: $ is not a function
at imageviewer.js:16
at imageviewer.js:789
(anonymous) # imageviewer.js:16
(anonymous) # imageviewer.js:789
The first few lines of the ImageViewer script - line 16 is the one with 'body'
/*
ImageViewer v 1.1.3
Author: Sudhanshu Yadav
Copyright (c) 2015-2016 to Sudhanshu Yadav - ignitersworld.com , released under the MIT license.
Demo on: http://ignitersworld.com/lab/imageViewer.html
*/
/*** picture view plugin ****/
(function ($, window, document, undefined) {
"use strict";
//an empty function
var noop = function () {};
var $body = $('body'),
$window = $(window),
$document = $(document);
The last line of the script is line 789, the source of the second error:
}((window.jQuery), window, document));
The header of my admin page:
<script type="text/javascript" src="/admin/jsi18n/"></script>
<link href="/static/imageviewer.css" type="text/css" media="all" rel="stylesheet" />
<script type="text/javascript" src="/static/admin/js/vendor/jquery/jquery.js"></script>
<script type="text/javascript" src="/static/admin/js/jquery.init.js"></script>
<script type="text/javascript" src="/static/admin/js/core.js"></script>
<script type="text/javascript" src="/static/admin/js/admin/RelatedObjectLookups.js"></script>
<script type="text/javascript" src="/static/admin/js/actions.js"></script>
<script type="text/javascript" src="/static/admin/js/urlify.js"></script>
<script type="text/javascript" src="/static/admin/js/prepopulate.js"></script>
<script type="text/javascript" src="/static/admin/js/vendor/xregexp/xregexp.js"></script>
<script type="text/javascript" src="/static/imageviewer.js"></script>
<script type="text/javascript" src="/static/my_code.js"></script>
The html for my image in the admin page:
<div class="readonly"><div id="image-gallery-3" class="cf"><img src="/documents/bfa1a808-7412-46c0-9d68-1a1df98f5a9c_thumb.jpg" data-high-res-src="/documents/bfa1a808-7412-46c0-9d68-1a1df98f5a9c.jpg" alt="" class="pannable-image"></div></div>
And the my_code.js to make this thing work, as shown in the example:
$(function () {
$('.pannable-image').ImageViewer();
});
The only difference between the example page for ImageViewer and my code is that the my_code.js appears in the example page after the html for the image, and my_code.js appears before the html for the image. Does that make a difference?
I am not a js guy, and I have run into this same error before when trying to integrate a third party Javascript code with the django admin pages. I still don't have a solution to this problem, except not to try to use any custom js with the django admin pages!
I think there is some sort of interaction between the django jquery and third party js, which causes this error, but again, I am not a js guy! I have google the error and integrating third party js with the django admin, but have not found anything that works.
Thanks!
Mark

After some testing and more googling I found the following answer.
I had to add the line var jQuery = django.jQuery, $ = jQuery; at the top of the imageviweer.js file. The issues was the line django.jQuery = jQuery.noConflict(true); in jquery.init.js.
This image viewer allows one to zoom in on an image. So, there are really two images, the one that is loaded on the page, and the one that the imageviewer script manipulates for the zoom and pan. The image on my page seems to have been too small. Once I increased the size of that image, the zoom/pan worked.
Problem solved, and I hope this is a "universal" solution for future third party javascript plugins for the django admin pages.
Mark

jQuery code always returns "not defined" in Sublime

I have my jQuery linked in the html file before the js file, and I've ensured that it is loading properly in the browser window. The jQuery code actually WORKS, so I have no idea why sublime thinks it cant understand the sytax. I've tried just about every suggestion in this post (JQuery - $ is not defined) which there was a ton. Also, i dont currently have sublimeLinter installed, currently using a console that i set up with this (http://www.wikihow.com/Create-a-Javascript-Console-in-Sublime-Text).
This code:
<html>
<head>
<script type="text/javascript" src="jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="script.js"></script>
</head>
<body> </body>
</html>
with this js:
var $j = jQuery.noConflict();
$j(document).ready(function() {
$j("body").text("Hello world!");
});
leads to this error message:

Add an ignore comment to the top of your document. What is happening is that your linter is not seeing jQuery as it is not part of the current document. This will force your linter to ignore the jQuery keyword while linting.
/*globals $:false, jQuery:false*/

$('body').layout is not a function

I'm using the jQuery UI Layout plugin and I keep getting this error in Firebug: $('body').layout is not a function. I also get the same error in IE8 and below.
Obviously, it's being caused by the line where I initiate the layout UI in my scripts file:
$('body').layout({ *options here* });
Is there a way to prevent this error from showing? I'm pretty sure I need the BODY selector for this particular plugin to run.
** SOLUTION **
As the helpful answers say below, I had this line: $('body').layout({ *options here* }); BEFORE I included my jQuery and jQuery UI Layout Plugin files. Once I put the body.layout after those two inclusions, the error went away.

You seem to either
1) have not included the plugin properly (script tag missing/typo in the url, included it before loading jquery itself, whatever else could go wrong)
 or
2) calling $("body").layout too early - wrap it with $(document).ready(function() { });
it should be
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.layout.js"></script>
...
<script type="text/javascript">
$(document).ready(function() {
$("body").layout() // will work now
});
</script>

Make sure you're including the lines:
<SCRIPT type="text/javascript" src="/path/to/jquery-latest.js"></SCRIPT>
<SCRIPT type="text/javascript" src="/path/to/jquery.layout-latest.js"></SCRIPT>
Prior to the code you placed in your question. Otherwise, layout will have been undefined before use.

ReferenceError for 3rd party library used in jQuery plugin, on android

I'm working on an app that uses a jQuery UI plugin, which in turn uses the Raphael library. Things work great on iOS and normal browsers, but on android I am getting the error:
ReferenceError: can't find variable Raphael
raised in this line of the init method of the jQuery UI plugin I wrote (jquery.ui.sketch.js):
var p = Raphael(el.attr("id"));
This is the head of my index.html that I'm using to mock-up my app:
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.4.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js" type="text/javascript"></script>
<script type="text/javascript" src="/js/raphael.js"></script>
<script type="text/javascript" src="/js/raphael.json.js"></script>
<script type="text/javascript" src="jquery.ui.sketch.js"></script>
And the body looks like:
<body id="home">
... a bunch of divs
<script type="text/javascript">
$(function(){
// ...jquery stuff that works fine
// initialize sketch widget, FAILS HERE ON ANDROID:
$('#paper').sketch({
saved: function(e,ui){
savedDrawing = ui;
alert("saved JSON to a global variable 'savedDrawing'");
},
// these could be bound to an element if we want:
startdrawing: function(){
console.log("figure started");
},
donedrawing: function(){
console.log("finished drawing");
}
});
</script>
I'm kind of stumped.

Seems the issue is simply that Raphael doesn't support Android (or rather has no way of doing SVG). Duh. Apparently v3.0 browser has SVG support.

Jquery validation with zip codes

I have a program that allows a user to enter a zip code to generate a google map. I want to make sure that the zip code is valid. To do so I am using the jquery validate method. Here is how my code looks:
$('#zipInput').validator({
format: 'zipUS',
invalidEmpty: true,
correct: function () {
//Code for correct
},
error: function() {
//Error code here
}
});
The problem is that this is not working for me. I get the error $('#zipInput').validator if not a function. I have been looking for examples of the validate method online and I used this link to build my code. I have added jquery.validate.js to my web page as well (issue with incorrect sources maybe?) Any suggestions or examples that I could look at to help figure out my issue?
EDIT: Here is all of the scripts I use in order:
<script src="jquery-1.5.1.min.js" type="text/javascript"></script>
<script src="jquery-ui-1.8.11.custom.min.js" type="text/javascript"></script>
<script type="text/javascript" src="jquery.jscrollpane.min.js"></script>
<script src="mwheelIntent.js" type="text/javascript"></script>
<script src="jquery.validate.js" type="text/javascript"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script src="Default.js" type="text/javascript"></script>

You need to do at least two things:
Load jQuery itself before the plugin.
Enclose your code in a jQuery.ready() construct.
If you are already doing so, please post all the relevant code.

You have to put a call to the validator code you've written inside the function which you are using to call the dialog. This is if the validator code is in the dialog which you are loading.
Another idea is to put the validator code inside the jquery.ready function in the form from which you load the dialog, but this will add some redundant code to that page.