I need to set the class for an element in my page. With plain JavaScript, I would write something like:
document.getElementById('foo').className = "my_class";
This just sets the class, which is exactly what I want. But I'm using jQuery on my page and so would like to do this in a "jQuery way", since it seems weird to mix the old style and the jQuery style. But jQuery apparently only allows you use addClass() or removeClass(), like so:
$('#foo').addClass("my_class");
The problem is that it merely adds a class to the element, it does not replace the currently existing class. Does this mean I have to keep track of the old class and do a removeClass() first? Is there no way to tell jQuery to replace the current class no matter what it is and just replace it with a new one?
To remove all classes from an element:
$('#foo').removeClass();
Specifying no arguments to removeClass removes all the classes. So your solution would be:
$('#foo').removeClass().addClass('my_class');
使用.attr()
直接设置class
属性:
$('#foo').attr('class', 'my_class');
您可以像这样使用.attr()
函数:
$('#foo').attr('class', 'my_class');
You could use that:
$('#foo').attr('class', 'my_class');
It will replace any class with "my_class"
$('#foo').removeClass().addClass('my_class');
Ah, found the answer just seconds after I posted the question. Apparently my Google skills were insufficient... :-(
At any rate, the answer is in the removeClass() function. So, you can do:
$('#foo').removeClass().addClass("my_class");
Couldn't be simpler.
你可以尝试使用.toggleClass()
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