用JSON数据填充HTML表 [英] Populate HTML table with JSON data

问题描述

我们将非常感谢您提供一些指导，[我们很早就开始编码]，并查看了许多示例，但无法将JSON导入表中.

We would be grateful for some guidance, [we are early into coding] and have looked at lots of examples but can cannot get our JSON to import into the table.

那时，我们在线获取了表数据，但是现在可以使用格式正确的JSON文件，并且该文件会自动更新，并且我们希望在加载页面时将其立即加载到表中.

At that moment we have the table data in-line however a correctly formatted JSON file is now available and automatically updates and we want to load it into the table on the fly when the page is loaded.

这是当前使用的示例:

<div>
<p> *** OTHER STUFF HERE ***<p/>
    <table id="gable">
        <colgroup>
            <col class="twenty" />
            <col class="fourty" />
            <col class="thirtyfive" />
            <col class="twentyfive" />
        </colgroup>
        <tr>
            <th onclick="sortTable(0)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspCOUNTRY</th>
            <th onclick="sortTable(1)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspLOCATION</th>
            <th onclick="sortTable(2)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspBALANCE</th>
            <th onclick="sortTable(3)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspDATE</th>
        </tr>
    </table>
</div>
<script>
var data = [
    { "COUNTRY":"UK", "LoC":"London", "BALANCE":"78,573", "DATE":"1/06/2018" },
    { "COUNTRY":"US", "LoC":"New York", "BALANCE":"43,568", "DATE":"18/05/2018" },
    { "COUNTRY":"PL", "LoC":"Kraków", "BALANCE":"12,362", "DATE":"22/06/2018" },
    { "COUNTRY":"AU", "LoC":"Townsville", "BALANCE":"7,569", "DATE":"1/07/2018" },
    { "COUNTRY":" ", "LoC":"BALANCE:", "BALANCE":"142,072", "DATE":" " }
];
var table = document.getElementById('gable');
data.forEach(function(object) {
    var tr = document.createElement('tr');
    tr.innerHTML = '<td>' + object.COUNTRY + '</td>' +
        '<td>' + object.LoC + '</td>' +
        '<td>' + object.BALANCE + '</td>' +
        '<td>' + object.DATE + '</td>';
    table.appendChild(tr);
});
</script>

有更多的数据行，该表具有CSS样式，并将sortTable(n)函数应用于Headers.它显示完美，外观和功能如我们所愿，

There are a lot more lines of data, the table has CSS styling and applies the sortTable(n) function to the Headers. It displays perfectly, looks and functions like we want,

我们已经Google搜索了[很多]，并尝试了各种加载/填充脚本，并尝试获取有关w3schools正常运行的示例-

We've Googled [lots] and tried various load / populate scripts and attempted to get the example on w3schools working - https://www.w3schools.com/js/js_json_html.asp - alas we're fairly new to this.

我们的JSON文件/assets/sample.JSON格式正确且符合要求.

Our JSON file /assets/sample.JSON is correctly formatted and meets the requirements.

我们如何简单地导入JSON以填充表id ="gable"?

How do we do a simple import of the JSON to populate the table id="gable"?

推荐答案

好，因此在此解决方案中，我将假设您的外部json文件称为'example.json'

Ok, so in this solution I am going to assume that your external json file is called 'example.json'

您的外部文件应如下所示 example.json:

Your external file should look something like this example.json:

[
  { "COUNTRY":"UK", "LoC":"London", "BALANCE":"78,573", "DATE":"1/06/2018" },
  { "COUNTRY":"US", "LoC":"New York", "BALANCE":"43,568", "DATE":"18/05/2018" },
  { "COUNTRY":"PL", "LoC":"Kraków", "BALANCE":"12,362", "DATE":"22/06/2018" },
  { "COUNTRY":"AU", "LoC":"Townsville", "BALANCE":"7,569", "DATE":"1/07/2018" },
  { "COUNTRY":" ", "LoC":"BALANCE:", "BALANCE":"142,072", "DATE":" " }
]

所有脚本标记中所做的更改都与html相同.我将功能分为2个新功能.第一个函数(get_json_data)从外部json文件获取json数据.第二个函数(append_json)将数据追加到表中.

The html remains the same all the changes have been made in the script tags. I split the functionality into 2 new functions. The first function (get_json_data) gets the json data from the external json file. The second function (append_json) appends the data to the table.

我在整个代码中添加了注释，以解释一切.如果您有任何疑问或不清楚的地方，请告诉我.

I have put comments throughout the code to explain what everything is doing. if you have any questions or if something is unclear let me know.

这是html文件的代码:

here is the code for the html file:

<div>
        <p> *** OTHER STUFF HERE ***<p/>
        <table id="gable">
            <colgroup>
                <col class="twenty" />
                <col class="fourty" />
                <col class="thirtyfive" />
                <col class="twentyfive" />
            </colgroup>
            <tr>
                <th onclick="sortTable(0)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspCOUNTRY</th>
                <th onclick="sortTable(1)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspLOCATION</th>
                <th onclick="sortTable(2)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspBALANCE</th>
                <th onclick="sortTable(3)"><span class="glyphicon glyphicon-sort"></span>&nbsp&nbspDATE</th>
            </tr>
        </table>
    </div>
    <script>
        //first add an event listener for page load
        document.addEventListener( "DOMContentLoaded", get_json_data, false ); // get_json_data is the function name that will fire on page load

        //this function is in the event listener and will execute on page load
        function get_json_data(){
            // Relative URL of external json file
            var json_url = 'example.json';

            //Build the XMLHttpRequest (aka AJAX Request)
            xmlhttp = new XMLHttpRequest();
            xmlhttp.onreadystatechange = function() { 
                if (this.readyState == 4 && this.status == 200) {//when a good response is given do this

                    var data = JSON.parse(this.responseText); // convert the response to a json object
                    append_json(data);// pass the json object to the append_json function
                }
            }
            //set the request destination and type
            xmlhttp.open("POST", json_url, true);
            //set required headers for the request
            xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            // send the request
            xmlhttp.send(); // when the request completes it will execute the code in onreadystatechange section
        }

        //this function appends the json data to the table 'gable'
        function append_json(data){
            var table = document.getElementById('gable');
            data.forEach(function(object) {
                var tr = document.createElement('tr');
                tr.innerHTML = '<td>' + object.COUNTRY + '</td>' +
                '<td>' + object.LoC + '</td>' +
                '<td>' + object.BALANCE + '</td>' +
                '<td>' + object.DATE + '</td>';
                table.appendChild(tr);
            });
        }
    </script>

这篇关于用JSON数据填充HTML表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！