General JS-Problems with templates and jQuery » History » Version 10

Jörg Kiekebusch, 04/27/2012 11:04 PM

1 1 Max Milbers
h1. General JS-Problems with templates and jQuery
3 7 Alex Steiner
jQuery is often used by templaters and other extensions. jQuery must not be loaded more than one time. To prevent incompatibilities, you can easily switch off the loading of the virtuemart jQuery library. (Only turn off Virtuemart Jquery IF your template, or other modules are loading Jquery). This can be checked by viewing the page source.
4 1 Max Milbers
5 8 Alex Steiner
*To Disable Virtuemart Jquery*
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Look for this at /administrator/index.php?option=com_virtuemart&view=config tab templates. 
8 2 Max Milbers
The options for you important are:
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Using the Virtuemart jQuery 	
10 6 Alex Steiner
Using the product Scripts 	(Product Scripts have to be enabled for cart functions to work)
11 1 Max Milbers
Using the Script ajax Countries / Regions
Most jquery conflicts are fixed, when you disable the "Virtuemart jQuery" library. 
15 6 Alex Steiner
*Backend Menu Jquery Conflict*
16 5 Alex Steiner
*Slightly different, but similar is the problem, when the backend jQuery is broken.* You can recognize it when the menu on the left side is completely expanded and when the store/apply has no effect. This happens, when you do not have access to the jQuery of google. So you need to prevent using the jQuery of google. But you can't store the configuration. So you must 
17 2 Max Milbers
edit the virtuemart.cfg file in /administrator/components/com_virtuemart 
and change google_jquery=1 to google_jquery=0
Then go in your database and empty the table _virtuemart_adminmenuentries. Just use refresh your backend and the problem should be solved.
22 9 Patrick Kohl
23 10 Jörg Kiekebusch
h2. javascript/Css Template Overiding & Avoiding Conflicts between Libraries
24 9 Patrick Kohl
h3. using vmJsApi::js()
27 10 Jörg Kiekebusch
*A simple example :*
28 9 Patrick Kohl
29 10 Jörg Kiekebusch
By calling the function this way, we verify if the function already exists in the template (in templates/MY_TEMPLATE/js folder) before using the Virtuemart internal (components/virtuemart/assets/js folder).
The benefit is that you can place your own javascript in the (My_TEMPLATE) js folder and overide the virtuemart script.
A static array prevents duplicate loading of all javascripts loaded this way by using the first parameter(here 'jquery-ui')
32 9 Patrick Kohl
33 10 Jörg Kiekebusch
_In this example we load 'JOOMLAROOT/components/virtuemart/assets/js/jquery-ui.js' if this doesn't already exist in the template/js folder.
34 9 Patrick Kohl
35 10 Jörg Kiekebusch
*Full Example :*
36 9 Patrick Kohl
38 10 Jörg Kiekebusch
Here with all parameters the complete name and path are splitted.
In this case we load the library externally. Therefore we have '//' as 2nd parameter.
_Setting a path does not permit to auto-overide this file with the template version_
41 9 Patrick Kohl
42 10 Jörg Kiekebusch
As mentioned before, the first parameter is the name used to compare the loaded files and must always be the exactly the same. Do not change it for the override library or you loose the benefit of being able to compare them.
43 9 Patrick Kohl
Then using *vmJsApi::js('jquery-ui.1.8.6')* and *vmJsApi::js('jquery-ui')* has not the same *Main name* and simply do not prevent the reloading. For this you must *always use same name* for *same library* and change the parameter number 3(in this case '1.8.16').
46 10 Jörg Kiekebusch
The last parameter used here is *true*  and must be set if you want use the minified version (this add .min in the file name to load).
47 9 Patrick Kohl
In this example we load '//' (http// is not needed for external load and permit to auto load http or https revision from Google here in case of SSL)
h3. using vmJsApi::css()
The logic is same but the path change
load the facebox.css testing if the file exist in template (in templates/MY_TEMPLATE/css folder) or load the virtuemart css (components/virtuemart/assets/css folder).