Question

这是我的问题。我有以下功能

def index():
    rows=db(db.mylist).select()
    return dict(rows=rows)

所以每当我重新加载前视图索引时，我想从数据库中检索行并在列表中向用户显示数据

{{for(r in rows)}}
    li.innerhtml={{=rows.task}}
{{pass}}

显然，这不是正确的做法。我想我必须使用json和XML。

这是我正在使用的表格

db.define_table(
   'mylist',
   Field('task', 'string')
)

<div class="col-sm-6">
         <div class="panel panel-default">
             <div class="panel-heading center " style="color: black; font-style: inherit">
                 <form>
                 Task:
                <input name="name" id="task"  />
                     <button type="button" class="btn btn-success btn-sm" onclick=add(),ajax('{{=URL('default','insert_task')}}',['name'])  >add</button>
                     </form>

             </div>

              <div class="panel-body center">
                  <ul id="list" class="list-group">  </ul>
              </div>

         </div>

     </div>
 </div>


var ul = document.getElementById("list");
var lastId=0;
function add()
    {
        if(!isBlank(document.getElementById("task").value)) {


            var iCon = document.createElement('div'); //create a div container
            var dbtMenu=document.createElement('div');
            var li = document.createElement("il");  //create a list-element
            var closeSpan = document.createElement("span"); //create a span for badge attribute
            var ClickListState=0;

            dbtMenu.setAttribute("class","container");
            //dbtMenu.appendChild(dropDownList);
            li.setAttribute('id',lastId); // set an attribute for id
            iCon.className = "glyphicon glyphicon-remove"; // image for remove button
            closeSpan.setAttribute("class", "badge"); //create a new attribute for span
            closeSpan.appendChild(iCon); // put it in the span set
            iCon.addEventListener("click",function(){var element=document.getElementById(li.getAttribute('id'));
                                                    element.parentNode.removeChild(element);}); //functionlity
            li.innerHTML = document.getElementById('task').value;
            var value=document.getElementById('task').value;
            var pass= document.getElementById('task').value;
            li.setAttribute("class", "list-group-item hover-yellow");
            li.addEventListener('click',function() {if(ClickListState==0){li.style.backgroundColor="red"; ClickListState++;}
                                                    else {li.style.backgroundColor="white"; ClickListState--; }});
            li.appendChild(closeSpan);
            lastId++;
            ul.appendChild(li);

        }
    }

function update()
    {
            {{for r in rows:}}
            var iCon = document.createElement('div'); //create a div container
            var dbtMenu = document.createElement('div');
            var li = document.createElement("il");  //create a list-element
            var closeSpan = document.createElement("span"); //create a span for badge attribute
            var ClickListState = 0;

            dbtMenu.setAttribute("class", "container");
            //dbtMenu.appendChild(dropDownList);
            li.setAttribute('id', lastId); // set an attribute for id
            iCon.className = "glyphicon glyphicon-remove"; // image for remove button
            closeSpan.setAttribute("class", "badge"); //create a new attribute for span
            closeSpan.appendChild(iCon); // put it in the span set
            iCon.addEventListener("click", function () {
                var element = document.getElementById(li.getAttribute('id'));
                element.parentNode.removeChild(element);
            });
           // var t ={#{=XML(response.json(r.task))}}
                    li.innerHTML = "t";
            var value = document.getElementById('task').value;
            var pass = document.getElementById('task').value;
            li.setAttribute("class", "list-group-item hover-yellow");
            li.addEventListener('click', function () {
                if (ClickListState == 0) {
                    li.style.backgroundColor = "red";
                    ClickListState++;
                }
                else {
                    li.style.backgroundColor = "white";
                    ClickListState--;
                }
            });
            li.appendChild(closeSpan);
            lastId++;
            ul.appendChild(li);

            {{pass}}

    }
    update();

Answer 1

在web2py here

中阅读模板语言的基本语法

你想要这个：

def index():
    rows = db(db.mylist).select()
    my_list = [row.task for row in rows]
    task_list = UL(*my_list)
    return dict(task_list=task_list)

其他解决方案可以是，使用html helpers在控制器函数中构建完整列表并将其传递给视图

{{=XML(task_list)}}

在视图中只做：

<!-- Views/index.html-->
{{extend 'layout.html'}}

<form id="task_form">
     Task:
    <input name="name" id="task"  />
    <input type="submit" class="btn btn-success btn-sm" value="Add" />
</form>

<div id="target"> {{=XML(task_list)}}</div>


<script>
jQuery('#task_form').submit(function() {
  ajax('{{=URL("default", "insert_task")}}',
       ['name'], 'target');
  return false;
});
</script>

XML是一个用于封装不应该的文本的对象逃脱了。

我建议您仔细阅读以下两个示例：Image blog和Simple wiki

修改

在编辑中，我认为您希望使用表单添加新任务，并希望在不刷新页面的情况下添加列表。

阅读Ajax form submission，simple wiki app
中也提供了相关的ajax示例
# Controller def index(): rows = db(db.mylist).select() my_list = [row.task for row in rows] task_list = UL(*my_list) return dict(task_list=task_list) def insert_task(): """an ajax callback that returns a <ul>""" task_name = request.vars.name db.mylist.insert(task=task_name) rows = db(db.mylist).select() my_list = [row.task for row in rows] task_list = UL(*my_list) return task_list

-

{{1}}

Answer 2

我想出了将python字符串列表转换为javascript字符串数组的方法：

{{def print_js_array(left_side, pylist):

  wrap_quotes = map(lambda a: "'{}'".format(a), pylist)

  comma_separated = "" if not pylist else reduce(lambda a,b: "{}, {}".format(a,b), wrap_quotes)

  return "{} = [{}];".format(left_side, comma_separated)
}}

{{=SCRIPT(
  ""
  + print_js_array("var un_pythoned", status_filter_options))
}}

给定python列表['', 'Not Started', 'Running', 'Finished', 'Failed']的结果为（html）：

<script><!--
var un_pythoned = ['', 'Not Started', 'Running', 'Finished', 'Failed'];
//--></script>

使数组可用于后续脚本。您可能会写一些类似于将字典打印为json的内容。

将python数据传递给web2py中的javascript

2 个答案: