How to delete information in javascript

How to delete information in javascript: first add a field in front of each piece of data; then click the batch delete button to jump to the batchDelete() method; and finally create the background processing code.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to delete information with javascript?

JS Ajax batch deletion of data information

Batch deletion of data information is already a very common functional requirement. The following is a JS Ajax submission to the background for data processing A small example of deletion:

First add a field in front of each piece of data to display a check box. The code is as follows:

<input type="checkbox" name="userCheck" value="${user.id}" />

Click the batch delete button to jump to batchDelete() Method: The code is as follows:

function batchDelete(){
    //判断至少选择了一项
    var checkedNum = $("input[name='userCheck']:checked").length;
    if (checkedNum == 0) {
        alert("至少选择一项删除！");
        return;
    }
    if (confirm("确定删除选中的用户？")) {
        var userList = new Array();
        $("input[name='userCheck']:checked").each(function(){
            userList.push($(this).val());
        });
    $.ajax({
            type : "post",
            url : "<%=request.getContextPath() %>/user/batchDelete",
            data : {userList : userList.toString()},
            success : function(){
                alert("删除成功！");
                location.reload();
            },
            error : function(){
                alert("刪除失败！")
            }
        });
    }
}

The background Java processing code is as follows:

@RequestMapping(value="/batchDelete")
public String batchDelete(String userList){
    String[] strs = userList.split(",");
    for (int i = 0; i < strs.length; i++) {
        userService.delete(Integer.parseInt(strs[i]));
    }
    return "redirect:/user/users";
}

Recommended study: "javascript Advanced Tutorial"

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