jQuery’s$ doesn’t work

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2

I’m using a code that uses $ jQuery, only when using the cipher it error in the console and the jQuery code ends up not working. The only solution was to use jQuery instead of $ :

jQuery(document).ready(function(){

    jQuery("#finalizarcadastrojovem").click(function(){

        var form = jQuery("#nome").val();

        console.log(form);

        return false;

    })
})

I wish I knew how to fix it 'cause I want to use it $ and not jQuery

jquery
  • 7

    Are you using another framework that uses $ as well? Sometimes because of order and compatibility, the $ ends up being overwritten, for this has the function $.noConflict.

3 answers

5

Wakim is right, there is probably another code (probably another framework) using $. But what you may not know is that jQuery passes the object itself jQuery as an argument from callback of ready. So you can do it like this:

jQuery(document).ready(function($){    
    $("#finalizarcadastrojovem").click(function(){
        var form = $("#nome").val();   
        console.log(form);    
        return false;   
    });
});

  • Still, it’s worth checking the other frameworks you use and using $.noConflict() to avoid the risk of disrupting the other framework.

  • Actually I’m pretty sure jQuery also defines the object jQuery globally and the $ as shortcut. How it should load another framework that overwrites the $, soon only leaves the jQuery.

  • Exactly, @Wakim. And use noConflit to define $ would interfere with the other framework. So I think the solution I am proposing is reasonable.

  • @bfavaretto, the noConflict does not define the $, take a look: "If you need to use Another Javascript library alongside jQuery, Return control of $ back to the other library with a call to $.noConflict()" http://api.jquery.com/jquery.noconflict/

  • 2

    @Pedrolorentz This is if jQuery is loaded later. In the question code, I believe it is being loaded before the other framework.

5


You must have some other script forcing jQuery instead of $

search for jQuery.noConflict()

but to help you try:

<script type="text/javascript">
    var $ = jQuery.noConflict();
    $(document).ready(function(){

        $("#finalizarcadastrojovem").click(function(){

            var form = jQuery("#nome").val();

            console.log(form);

            return false;

        })
    });
</script>

But the advice is that you search the scripts and try to find this forced jQuery, if you have nothing I do not know what to say, I use enough jQuery.noConflict() from a look http://api.jquery.com/jquery.noconflict/

  • var $ = jQuery.noConflict(); will erase the reference to $ if another library is already using it and forcing jQuery (!). The probability of generating a new error is high.

1

There are several ways to restore the dollar.

Some CMS like wordpress use by default jQuery instead of $ to avoid possible conflicts with other libraries. Keep in mind to use jQuery is safer than $.

To force globally can do:

window.$ = jQuery;

Even that in this way removes the $ to other libraries that might be using it and force jQuery. This will cause the other library to fail. Maintaining the jQuery is safer.

To do so "controlled"

jQuery(document).ready(function ($) {
        jQuery("#finalizarcadastrojovem").click(function () {
            var form = jQuery("#nome").val();
            console.log(form);
            return false;
        })
});

So you can recover the dollar only within this scope and in the global space the dollar is "available" to be used by other libraries.

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