jQuery AJAX 每个循环使用append 和html

Question

我想从下面的代码中检索 json 文件的数据，但问题是，如果我再次按下按钮，我会看到两倍的结果。我将每个循环的第一个附加更改为 html，但随后仅加载 json 的最后一个对象。

HTML:

<ul id="myorders"></ul>
<button type="button" id="add-order">Load the orders</button>

JS:

$("#add-order").click(function(){ 

    $.getJSON('API/orders.json', function(data){

        $.each(data, function(i, order){
            $("#myorders").append("<p><li> id: " + data[i].order.id + "</li>");
            $("#myorders").append("<li> Name: " + data[i].order.name + "</li>");
            $("#myorders").append("<li> Drink: " + data[i].order.drink + "</li></p>")
        });         
    });
});

数据示例:

[{ "order":{"id": "1",
    "name": "Bill",
    "drink": "Capuccino"}},


  { "order":{"id": "2",
    "name": "Sofia",
    "drink": "Late"
}}]

Answer 1

<强> Working fiddle 。

.one() : Attach a handler to an event for the elements. The handler is executed at most once per element per event type.

您可以使用 JQuery one()这将触发一次点击:

$("#add-order").one("click", function(){ 
    $.getJSON('API/orders.json', function(data){

        var my_orders = $("#myorders");

        $.each(data, function(i, order){
            my_orders.append("<li> id: " + data[i].order.id + "</li>");
            my_orders.append("<li> Name: " + data[i].order.name + "</li>");
            my_orders.append("<li> Drink: " + data[i].order.drink + "</li>")
        });    
    }); 
});

注意:您附加了无效的 HTML，<li>标签应该是 ul 的直接子级所以你应该删除 p .

希望这有帮助。

<小时/>

var data = [{ "order":{"id": "1",
    "name": "Bill",
    "drink": "Capuccino"}},


  { "order":{"id": "2",
    "name": "Sofia",
    "drink": "Late"
}}]

$("#add-order").one("click", function(){ 
  var my_orders = $("#myorders");

  $.each(data, function(i, order){
    my_orders.append("<li> id: " + data[i].order.id + "</li>");
    my_orders.append("<li> Name: " + data[i].order.name + "</li>");
    my_orders.append("<li> Drink: " + data[i].order.drink + "</li>")
  });   
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="myorders"></ul>
<button type="button" id="add-order">Load the orders</button>