Question

我在一个开启（'模糊'）听众。 $（this）是我正在研究的DOM元素。当我的XMLHttpRequest.onload触发时，我需要继续处理$（this）。

$('#gameListDiv').on('blur','td', function(){
    var myObject = $(this);
    var myRequest = new XMLHttprequest();
    .
    alert(myObject.attr("class")); // popup: "myClass"
    .
    myRequest.onload = function() {
        if (myRequest.status === 200) {
            // How do I pass myObject Here so I can continue working with it?
            alert(myObject.attr("class")); // popup doesn't happen
        }
    }
}

如何将myObject'传递到线'。我需要根据XMLHttprequest的responseText更改它的ID。

Answer 1

您无需传入。由于您已将其存储在闭包中的变量中，因此onload可以访问它。只是按原样访问

$('#gameListDiv').on('blur','td', function(){
    var myObject = $(this);
    var myRequest = new XMLHttprequest();
    .
    .
    .
    myRequest.onload = function() {
        if (myRequest.status === 200) {
            myObject//totally legal and same as above
        }
    }
}

Answer 2

发现了问题。我在myRequest.onload语句块中错过了一个分号，导致了不稳定的结果。

Answer 3

如果您无法访问变量，只需增加其范围，使其可以从代码的任何部分访问：

use Icicle\Coroutine\Coroutine;
use Icicle\Dns\Executor\Executor;
use Icicle\Dns\Resolver\Resolver;
use Icicle\Loop;
use Icicle\Socket\Client\Connector;

$generator = function () {
    try {
        $resolver = new Resolver(new Executor('8.8.8.8'));

        // Coroutine pauses until yielded promise is fulfilled or rejected.
        $ips = (yield $resolver->resolve('example.com'));

        $connector = new Connector();

        // Coroutine pauses again until yielded promise is fulfilled or rejected.
        $client = (yield $connector->connect($ips[0], 80));

        echo "Asynchronously connected to example.com:80\n";
    } catch (Exception $exception) {
        echo "Asynchronous task failed: {$exception->getMessage()}\n";
    }
};

$coroutine = new Coroutine($generator());

Loop\run();

在此var myObject = $("#gameListDiv"); myObject.on('blur','td', function(){ var myRequest = new XMLHttprequest(); . alert(myObject.attr("class")); // popup: "myClass" . myRequest.onload = function() { if (myRequest.status === 200) { // How do I pass myObject Here so I can continue working with it? alert(myObject.attr("class")); // popup doesn't happen } } }中myObject。

See Javascript Scope here.

如何在XMLHttpRequest.onload = function中访问$（this）

3 个答案: