How to change tr attribute in jquery

How to change the tr attribute in jquery: 1. Set the attribute directly. This method may not be valid in HTML because the bgcolor attribute is not supported; 2. Use the ".css()" method, which is mainly used to set CSS Attributes; 3. Provide a function for the "attr()" method, which allows attributes to be dynamically set based on existing attribute values ​​or other factors.

Operating system for this tutorial: Windows 10 system, jQuery3.7.0 version, Dell G3 computer.

jQuery is a fast, concise JavaScript library that simplifies tasks such as HTML document traversal and manipulation, event handling, animation, and Ajax operations. In jQuery, you can use different methods to change the attributes of HTML elements.

The following are some examples showing how to use jQuery to change the attributes of the a34de1251f0d9fe1e645927f19a896e8 (table row, table row) element:

1. Set the attributes directly:

$("tr").attr("attributeName", "newValue");

For example, to change the background color of a a34de1251f0d9fe1e645927f19a896e8 element, you would write:

$("tr").attr("bgcolor", "#f2f2f2");

Please note that this method may not work in HTML because it does not support the bgcolor attribute . In fact, for background color, CSS is often recommended.

2. Use the .css() method:

$("tr").css("cssPropertyName", "newValue");

This method is mainly used to set CSS properties. For example, to change the background color of a a34de1251f0d9fe1e645927f19a896e8 element, you can write:

$("tr").css("backgroundColor", "#f2f2f2");

3. Provide a function for the attr() method:

$("tr").attr("attributeName", function(index, oldValue) {  
    // 在这里，index 是当前元素的索引，oldValue 是旧的值。  
    // 返回一个新的值。  
    return "newValue";  
});

This approach allows you to dynamically set properties based on existing property values ​​or other factors. For example, if you want to change the background color of a a34de1251f0d9fe1e645927f19a896e8 element, but the color should be based on its index, you can write:

$("tr").attr("bgcolor", function(index) {  
    let colors = ["#f2f2f2", "#f0f0f0", "#e8e8e8", "#e5e5e5"]; // 假设你有4个<tr>元素  
    return colors[index % colors.length]; // 循环使用这4种颜色  
});

The above are several ways to change the properties of the a34de1251f0d9fe1e645927f19a896e8 element using jQuery . If you want to change HTML attributes (such as id, class, etc.), then you should use the attr() method. If you want to change CSS properties (such as width, height, margin, etc.), then you should use the css() method.

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