如何使用jquery突出显示所选列表项？ [英] How can I highlight a selected list item with jquery?

问题描述

我在列表中有几个项目，并希望通过应用一些css样式，可能是背景颜色等来突出显示用户点击的项目。

I have several items in a list and want to highlight the one a user clicks on by applying some css style, maybe a background color etc.

我的HTML看起来像这样：

My HTML looks like this:

<ul class="thumbnails">
    <li>
        <a href="#" class="thumbnail">
            <img class="giftthumb" src='thumb1.jpg' alt="">
            <span class="gifttitle">Thumb1</span>
        </a>    
    </li>
    <li>
        <a href="#" class="thumbnail">
            <img class="giftthumb" src='thumb2.jpg' alt="">
            <span class="gifttitle">Thumb3</span>
        </a>    
    </li>
    <li>
        <a href="#" class="thumbnail">
            <img class="giftthumb" src='thumb3.jpg' alt="">
            <span class="gifttitle">Thumb3</span>
        </a>    
    </li>
</ul>

jQUery检索所选项目：

jQUery to retrieve selected item:

$('.thumbnail').click(function(e) {
    e.preventDefault();

    ???

})

推荐答案

你可以使用jQuery的类管理方法（即 addClass（）和 removeClass（）在这种情况下）在所选项目上添加一个类，并从所有其他项目中删除相同的类（如果您希望一次只选择一个）。 / p>

You could use jQuery's class management methods (namely addClass() and removeClass() in this case) to add a class on the selected item and remove the same class from all the other items (if you want only one selected at a time).

//save class name so it can be reused easily
//if I want to change it, I have to change it one place
var classHighlight = 'highlight'; 

//.click() will return the result of $('.thumbnail')
//I save it for future reference so I don't have to query the DOM again
var $thumbs = $('.thumbnail').click(function(e) {
    e.preventDefault();
    //run removeClass on every element
    //if the elements are not static, you might want to rerun $('.thumbnail')
    //instead of the saved $thumbs
    $thumbs.removeClass(classHighlight);
    //add the class to the currently clicked element (this)
    $(this).addClass(classHighlight);
});

然后在你的CSS中添加：

Then in your CSS just add:

.highlight {
    background-color: cyan;
    font-weight: bold;
}

jsFiddle演示

这比直接从jQuery / Javascript更改CSS属性更好（使用 .css（）方法，例如），因为关注点的分离将使您的代码更易于管理和阅读。

This is a better solution than changing CSS properties directly from jQuery/Javascript (with the .css() method for example), because separation of concerns will make your code more manageable and readable.

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