在使用preventDefault之后尝试重新启用链接 [英] trying to reenable link after preventDefault has been used

问题描述

我有一个带有文本没有新通知"的链接.以下代码用于使链接不可点击:

I have a link with the text "No New Notifications". The following code is used to make the link not clickable:

if ($.trim($('a#full_notifications_link').text()) == "No New Notifications"){
    $('a#full_notifications_link').click(function(){
        event.preventDefault();
        return false;
    });
}

我正在使用Ajax轮询服务器并更新文本.当文字更新为查看所有通知"时，我希望链接变为可点击的.我正在使用以下代码，但无法正常工作.

I am using Ajax to poll the server and update the text. When the text is updated to say "See All Notifications", I want the link to become clickable. I am using the following code, but it is not working.

$(document).ajaxComplete(function(){
    if ($.trim($('a#full_notifications_link').text()) == "See All Notifications"){
        $('a#full_notifications_link').click(function(){
            return true;
        });
    }
});

我知道问题与返回true有关，因为如果我在返回true之前就将警报放入，则警报有效.不幸的是，该链接仍然不可点击.

I know the problem has something to do with returning true, because if i put an alert in right before returning true, the alert works. Unfortunately, the link is still unclickable.

我也无法更改任何html，因为后端每次生成的HTML都不一样.

I also CANNOT change any of my html because it is generated differently every time by the backend.

推荐答案

添加新的事件处理程序不会删除您已有的事件处理程序，因此仍会阻止默认操作.

Adding a new event handler does not remove the event handlers you already have, so the default action is still prevented.

改为使用on()和off()

if ($.trim($('a#full_notifications_link').text()) == "No New Notifications"){

    $('a#full_notifications_link').on(function(event){
        event.preventDefault();
    });
}

$(document).ajaxComplete(function(){
    if ($.trim($('a#full_notifications_link').text()) == "See All Notifications"){

        $('a#full_notifications_link').off('click');

    }
});

仅检查事件处理程序中的文本似乎更容易

It does seem easier to just check the text inside the event handler

$('a#full_notifications_link').on('click', function(e) {
     if ( $.trim($(this).text())  == "No New Notifications"){
         e.preventDefault();
     }
});

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