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jquery - How to resolve two jquery conflict

I have a page which includes two jquerys one for slider other for populate dropdawn.The problem is when I put both of them my jqueries are not working together.What should i do?
My index:
<!-- JAVASCRIPTs for slider -->
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/comment-reply.js"></script>
<script type="text/javascript" src="js/jquery.quicksand.js"></script>
<script type="text/javascript" src="js/jquery.tipsy.js"></script>
<script type="text/javascript" src="js/jquery.prettyPhoto.js"></script>
<script type="text/javascript" src="js/jquery.cycle.min.js"></script>
<script type="text/javascript" src="js/jquery.anythingslider.js"></script>
<script type="text/javascript" src="js/jquery.eislideshow.js"></script>
<script type="text/javascript" src="js/jquery.easing.js"></script>
<script type="text/javascript" src="js/jquery.flexslider-min.js"></script>
<script type="text/javascript" src="js/jquery.aw-showcase.js"></script>
<script type="text/javascript" src="js/layerslider.kreaturamedia.jquery-min.js"></script>
<script type="text/javascript" src="js/shortcodes.js"></script>
<script type="text/javascript" src="js/jquery.colorbox-min.js"></script>
<script type="text/javascript" src="js/jquery.tweetable.js"></script>
<script type="text/javascript" src="js/slider-layer.js"></script>
<!-- JAVASCRIPTs for dropdawn -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(document).on('change','.productcategory',function(){
console.log("hmm its change");
var cat_id=$(this).val();
var div=$('#d').parent();
var op=" ";
$.ajax({
type:'get',
url:'{!!URL::to('findProductName')!!}',
data:{'id':cat_id},
success:function(data){
//console.log('success');
//console.log(data);
console.log(data.length);
op+='<option value="0" selected disabled></option>';
for(var i=0;i<data.length;i++){
op+='<option value="'+data[i].id+'">'+data[i].model+'</option>';
console.log(data[i].model);
}
div.find('.productname').html(" ");
div.find('.productname').append(op);
},
error:function(){
}
});
});
});
</script>
I try to add
<script type="text/javascript">
var jQuery = $.noConflict(true);
</script>
but when add this in the end of bouth script then slider work and dropdown not, and when not add this code for conflict works dropdown and slider doesn't work.
I use next links:
Can I use multiple versions of jQuery on the same page?
http://jsfiddle.net/PGLVs/
Any ideas of what I'm doing wrong?

Basically you should release release $ or jQuery variable for newer versions so add noConflict between both versions as below. This will make $ alias available for newer version.
<script src"olderversion"></script>
<script type="text/javascript">
jQuery.noConflict();
</script>
<script src"newerversion"></script>
If in case you have to call any plugin with lot of lines using $ or jQuery using old versions you can folow below approach.
jQuery.noConflict();
(function( $ ) {// if you want to use $
$(function() {
// More code using $ as alias to jQuery
});
})(jQuery);
// Other code using $ as an alias to the other library
jQuery.noConflict();
(function( jQuery ) {// if you want to use $
$(function() {
// More code using jQuery as alias to jQuery
});
})(jQuery);
Please mark it as answer if it meets your requirement.

a quick example:
in the head:
<script type="text/javascript" src="/jqueryV1.js"></script>
<script type="text/javascript">
var $myJQ = jQuery.noConflict();
</script>
<script type="text/javascript" src="/jqueryV2.js"></script>
<!-- the version 2 in now in $ while the 1 is in $myJQ -->
code that uses version 2 can keep the global $.
Now in the rest of your code, you could simply replace all the $ by $myJQ where the version 1 is used, but it means rewriting all, what you can do instead is to use an argument that acts as a local var, to be able to keep $ in the code that uses version 1:
(function($){
//inside this function, using $ means using the global $myJQ
$('#selector')...
})($myJQ);

need to use jquery-1.min.js and jquery.min.js together

I need to use both below files but just one of the can work if both of the use in pae
<script src="jquery.min.js"></script>
<script src="jquery-1.min.js"></script>//just this work
Or if change order
<script src="jquery-1.min.js"></script>
<script src="jquery.min.js"></script>//just this work
I use a drag and drop plugin , this need jquery.min.js and my theme need to jquery-1.min.js for be responsive

You should be able to do this when you use noConflict.
<!-- load jQuery-1 -->
<script type="text/javascript" src="jquery-1.min.js"></script>
<script type="text/javascript">
var jQuery_1_min = $.noConflict(true);
</script>
<!-- load jQuery -->
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
var jQuery_min = $.noConflict(true);
</script>
Now whenever you need one of these files you can do this.
//example
$jQuery_min('.selector').live('click', function(){
//do something
});
If it still wont work I dont know anymore... This is the way everybody does it. Quick google search.

Jquery slider doesn't work with own jQuery variable

I am creating a widget that will eventually sit on a clients site, and I need to create my own jQuery variable, so that the jquery versions don't conflict. Currently I have the following code:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> // Clients own jquery.
<script type="text/javascript" src="sf_content/js/jquery-1.11.2.min.js"></script> // My jQuery.
<script type="text/javascript">
var $sf_jquery = $.noConflict(true);
</script>
Everything else works just fine, but jQuery slider stopped working when I changed to my own jquery:
TypeError: $sf_jquery(...).slider is not a function
Is the problem with the jQuery slider, or am I missing something else here?
Good plain javascript slider -tips are welcome as well!
Edit: Everything the widget needs, is inside function call like this:
$sf_jquery(function(){ // all of the code here });
Edit: The jQuery Ui is imported aswell. Just forgot to add it here. The importing looks like this:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> // Clients own jquery.
<script type="text/javascript" src="sf_content/js/jquery-1.11.2.min.js"></script>
<script type="text/javascript">
var $sf_jquery = $.noConflict(true);
</script>
<script type="text/javascript" src="sf_content/js/jquery-ui.min.js"></script>
Edit, Solution!
Dummy me didn't think that the slider isn't part of the native jQuery. The noConflict must be after the jQueryUI, like this:
<script type="text/javascript" src="sf_content/js/jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="sf_content/js/jquery-ui.min.js"></script>
<script type="text/javascript">
var $sf_jquery = $.noConflict(true);
</script>

You aren't including jQueryUI code (at least in your example).
Slider is part of jQueryUI and is not native to jQuery alone. (https://jqueryui.com/slider/)

Your "noconflict" function must be called before the second jQuery call.

jquery version of tinymce 4

I am trying to use jquery version of tinymce 4.
<script src="http://tinymce.cachefly.net/4.0/jquery.tinymce.min.js"></script>
<script>
$(function(){
$("textarea").tinymce();
});
</script>
<textarea>Your content here.</textarea>
But when I run the page, I get the error message tinymce is not defined. How can I fix it? Thank you.

You should add these files:
<script src="/js/jquery-1.10.2.js" type="text/javascript"></script>
<script src="/js/tinymce/tinymce.min.js" type="text/javascript"></script>
<script src="/js/tinymce/jquery.tinymce.min.js" type="text/javascript"></script>

Why does prototype.js interfere with unrelated javascript operations?

Building a website. When I order my tags like this, LightCycle works but Lightbox doesn't:
Lightcycle works, Lightbox doesn't:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript" src="./js/prototype.js"></script>
When I order it like this, Lightbox works but LightCycle doesn't:
Lightbox works, LightCycle doesn't:
<script type="text/javascript" src="./js/prototype.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
Frustrating.

You're having a conflict because both libraries use the $ shortcut. Look into the noconflict feature of jQuery or the equivalent of prototype.
You can read more here: http://docs.jquery.com/Using_jQuery_with_Other_Libraries

Because they use the same $ shorthand.
Try the following:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">jQuery.noConflict();</script>
<script type="text/javascript" src="./js/prototype.js"></script>

Does a call to jQuery.noConflict() fix it? You can also give jQuery an alias within your on functions if you miss the $ shortcut:
var $j = jQuery.noConflict();
References:
http://docs.jquery.com/Using_jQuery_with_Other_Libraries
http://samsami2u.wordpress.com/2009/03/14/prototypejs-jqueryjs-conflict-and-resolution/

So using Surreal Dreams recontamination, I implemented this:
<script src="./prototype.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script>
var $j = jQuery.noConflict();
// Use jQuery via $j(...)
$j(document).ready(function(){
$j("div").hide();
});
// Use Prototype with $(...), etc.
$('someid').hide();
</script>
<script type="text/javascript" src="./js/scriptaculous.js?load=effects,builder"></script>
<script type="text/javascript" src="./js/lightbox.js"></script>
<script type="text/javascript" src="http://malsup.github.com/chili-1.7.pack.js"></script>
<script type="text/javascript" src="http://cloud.github.com/downloads/malsup/cycle/jquery.cycle.lite.1.0.min.js"></script>
<script type="text/javascript">
$(function() {
$('#slideshow1').cycle({
delay: 2000,
speed: 1000,
});
});
</script>
The next question that springs to mind is what to replace 'someid' with. I'm assuming '#slideshow1'. But what displays when I do this is just a plain black page. Annoying.