How to access the name collection object through getElementsByName in js-JS Tutorial-php.cn

How to access the name collection object through getElementsByName in js

高洛峰

Release： 2016-12-08 13:24:50

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1. Find all elements with a given name attribute. This method will return a node collection, which can also be called an object collection.

2. This collection can be treated as an array, and the value of the length attribute represents the number of collections.

3. Because in the html page, name cannot uniquely determine an element, so the name of the method is getElementsByName instead of getElementByName

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
 
<body>
    <p>
        <input type="text" name="luck" value="我中奖了，中了一个亿" onclick="aa()" id="luck1" />
    </p>
    <p>
        <input type="text" name="luck" value="我交了女朋友" id="luck2" />
    </p>
    <p>
        <input type="text" name="luck" value="我升迁了" id="luck3" />
    </p>
    <p>
        <input type="text" name="luck" value="我买房了" id="luck4" />
    </p>
     
    <script>
        /*
        1、获取每一个文本框的值
        2、获取每一个文本框的类型
        3、为每一个文本框增加点击事件
        */
         
        /*
            第一步 获取name属性为luck值得对象数组(节点数组)
        */
        var luckElements = document.getElementsByName("luck");
         
        /*
            第二步 遍历节点数组
        */
        for(var i=0;i<luckElements.length;i++){
            //获取元素的value值
            alert(luckElements[i].value);
            //获取元素的type值
            alert(luckElements[i].type);
            //为每一个元素的onclick属性赋值即为文本框增加点击事件
            luckElements[i].onclick=function(){
                alert(this.value);
            }
        }
    </script>
</body>
</html>

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3. Because in the html page, name cannot uniquely determine an element, so the method The name is getElementsByName instead of getElementByName