我无法检查输入复选框元素

Question

我已动态生成此复选框元素，我正在尝试动态检查它。 我是这样做的：

var id = "123"; //dynamically generated

var input = document.createElement("input");

input.setAttribute("type", "checkbox");
input.setAttribute("name", "x_"+id);
input.setAttribute("id", "x_"+id);
input.setAttribute("value", "");

input.setAttribute("checked",true);  //This isn't working

var elem = document.getElementById('x_' + id);
elem.checked = true;      //This isn't working

Answer 1

您永远不会将该元素添加到页面中。它在这里工作，只需要做：

document.body.appendChild(input);

＆＃13;

＆＃13;

var id = "123"
var input = document.createElement("input");

input.setAttribute("type", "checkbox");
input.setAttribute("name", "x_"+id);
input.setAttribute("id", "x_"+id);
input.setAttribute("value", "");

input.setAttribute("checked",true);  //This isn't working

document.body.appendChild(input);

var elem = document.getElementById('x_' + id);
elem.checked = true;      //This isn't working`enter code here`

＆＃13;

＆＃13;

＆＃13;