Question

我正在尝试访问并返回在load事件中创建的result变量：

function submit_form_with_file(form, link, file)
{
    var iframe = $('<iframe name="postiframe" id="postiframe" style="display: none" ></iframe>');
    //append the iframe to the html page
    $("body").append(iframe);
    result="";
    var form = $(form);
    ...
    form.submit();
    $(iframe).load(function ()
    {
        var body=window.frames[$(iframe).attr("name")].document.body;
        result=(body.textContent || body.innerText);
        alert(result);
    });
    return result;
}

当我执行return result时，我想要两件事：等到我的iframe已加载，然后在load事件中返回result变量。怎么实现呢？

Answer 1

您不能从load回调中返回avalue，因为它是异步执行的，您可以做的是传递一个回调，该回调将在加载完成时调用。

function submit_form_with_file(form, link, file, loadCallback) {
    var iframe = $('<iframe name="postiframe" id="postiframe" style="display: none" />');
    // append the iframe to the html page
    $("body").append(iframe);
    result = "";
    var form = $(form);
    // ...
    form.submit();
    $(iframe).load(function () {
        var body = window.frames[$(iframe).attr("name")].document.body;
        result = (body.textContent || body.innerText);
        loadCallback(result);
    });
    return result;
}

然后

submit_form_with_file(form, link, file, function (result) {
    //loading is completed, do something with result
})

jquery：在onload事件中访问变量

1 个答案: