How to replace “live” from jQuery 1.8.3 to jQuery

问题:

This question already has an answer here:

• Turning live() into on() in jQuery 5 answers

My web framework automatically updated my jQuery script to the current last version, the 1.9.

Now all my:

$(".myclass").live("click", function() {...

don't work anymore. I mostly used it with some ajax called which filled html in my page.

I would know how to replace this functionnality in the last version. A friend told me to use "on" instead, but the "on" stays fixed on the same element.

Explanation, in this example (no ajax), I use a "+" icon, to display an "ul li list".

$(".closed").live('click', function(){
    $("#ul_list_"+$(this).attr('id')).addClass("displayed").removeClass("hidden").show();
    $(this).addClass("openned").removeClass('closed');
    $(this).html('<i class="icon-minus"></i>');
});

$(".openned").live('click', function(){
    $("#ul_list_"+$(this).attr('id')).addClass("hidden").removeClass("displayed").hide();
    $(this).addClass("closed").removeClass('openned');
    $(this).html('<i class="icon-plus"></i>');
});

(I know that the script is not the most optimized ever, but it worked. I used classes to open or close my lists. And if the visitor doesn't have JS enabled, nothing is hidden, all the folded lists are opened)

Notes:

• I've tried https://github.com/jquery/jquery-migrate, but the only message that I have is "JQMIGRATE: jQuery.fn.live() is deprecated", not how to fix it.

回答1:

The docs already provide an example:

Rewriting the .live() method in terms of its successors is straightforward; these are templates for equivalent calls for all three event attachment methods:

$(selector).live(events, data, handler); // jQuery 1.3+
$(document).delegate(selector, events, data, handler); // jQuery 1.4.3+
$(document).on(events, selector, data, handler); // jQuery 1.7+

So: $(document).on("click", ".closed", function() { ... }).

回答2:

You need to use on with a delegated handler:

$('#parent').on('click', '.closed', function() {
   // your code...
});

Note that you should replace #parent with the closest parent element to .closed which is available on page load - usually the element which .closed was appended to.

回答3:

you have to use the on instead of live. because live is deprecated on the version 1.7