Why jQuery event not firing when outside ready function, even after document is ready?

问题

Why does click event not firing in this case, although DOM appears to be loaded ('ready' shows in the console)?

$(document).ready(function() {
    console.log("ready!");
});

$("p").click(function() {
    alert("You clicked on paragraph.");
});

My understanding, that because code for click event is after document ready function is correctly executed, it should work, but it doesn't. It will only work when event is included between curly braces in ready function.

回答1:

$(document).ready is asynchronous. You are passing a callback function to it so that it logs the fact the DOM is ready. However, the click binding code is being executed immediately after you set up the ready handler, not when the callback has executed.

You just need to make sure you put the binding logic within the ready handler.

回答2:

If you want that code to be executed in the "ready" event, just move it there.

$(document).ready(function() {
    console.log("ready!");

    $("p").click(function() {
        alert("You clicked on paragraph.");
    });
});

The way you defined it right now doesn't mean it is executed when the DOM is loaded.

回答3:

You can place the code directly in the $(document).ready() function or create a new function that binds the click when the DOM is ready.

    $(document).ready(function() {
        bindClickEvent();
    });

    function bindClickEvent() {
       $("p").click(function() {
           alert("You clicked on paragraph.");
       });
    }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>

<p>Click me!</p>

来源：https://stackoverflow.com/questions/41665382/why-jquery-event-not-firing-when-outside-ready-function-even-after-document-is

标签

javascript

jquery

document-ready