在 jQuery 中删除事件处理程序的最佳方法? [英] Best way to remove an event handler in jQuery?
问题描述
我有一个 input type="image"
.这就像 Microsoft Excel 中的单元格注释.如果有人在与此 input-image
配对的文本框中输入一个数字,我会为 input-image
设置一个事件处理程序.然后,当用户点击 image
时,他们会弹出一个小弹出窗口,为数据添加一些注释.
I have an input type="image"
. This acts like the cell notes in Microsoft Excel. If someone enters a number into the text box that this input-image
is paired with, I setup an event handler for the input-image
. Then when the user clicks the image
, they get a little popup to add some notes to the data.
我的问题是,当用户在文本框中输入零时,我需要禁用 input-image
的事件处理程序.我尝试了以下方法,但无济于事.
My problem is that when a user enters a zero into the text box, I need to disable the input-image
's event handler. I have tried the following, but to no avail.
$('#myimage').click(function { return false; });
推荐答案
jQuery ≥ 1.7
从 jQuery 1.7 开始,事件 API 已更新,.bind()
/.unbind()
仍可用于向后兼容,但首选方法是使用on()/off() 函数.下面是,
jQuery ≥ 1.7
With jQuery 1.7 onward the event API has been updated, .bind()
/.unbind()
are still available for backwards compatibility, but the preferred method is using the on()/off() functions. The below would now be,
$('#myimage').click(function() { return false; }); // Adds another click event
$('#myimage').off('click');
$('#myimage').on('click.mynamespace', function() { /* Do stuff */ });
$('#myimage').off('click.mynamespace');
<小时>
jQuery <1.7
在您的示例代码中,您只是向图像添加另一个点击事件,而不是覆盖前一个:
jQuery < 1.7
In your example code you are simply adding another click event to the image, not overriding the previous one:
$('#myimage').click(function() { return false; }); // Adds another click event
这两个点击事件都会被触发.
Both click events will then get fired.
正如人们所说,您可以使用 unbind 删除所有点击事件:
As people have said you can use unbind to remove all click events:
$('#myimage').unbind('click');
如果您想添加单个事件然后将其删除(不删除可能已添加的任何其他事件),那么您可以使用事件命名空间:
If you want to add a single event and then remove it (without removing any others that might have been added) then you can use event namespacing:
$('#myimage').bind('click.mynamespace', function() { /* Do stuff */ });
并仅删除您的活动:
$('#myimage').unbind('click.mynamespace');
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