Javascript将CSV文件加载到数组中 [英] Javascript loading CSV file into an array

问题描述

我正在使用Wordpress开发一个网页。网页需要有一个与所有县组合的组合框。我有一个csv格式的数据集，对于所有这些县都有大约10k行。
当用户在下拉列表中选择一个县时，我只想在网页中显示所选的县数据。这是我的要求。

I am developing a web page in Wordpress. The webpage needs to have a combobox with all counties. I have a dataset in csv format which has some 10k rows for all these counties. When the user selects a county in the dropdown, I want only the selected county data displayed in the web page. This is my requirement.

在wordpress中，我的网页我使用

In wordpress, my web page I am adding the js file using

<script type="text/javascript" src="http://xxx/wp     content/uploads/2014/05/countyList1.js"></script>

并且网页下拉代码是

<select name="county" id="county" onload="setCounties();" onchange="getSelectedCountyData();"></select>

在countyList1.js文件中，我有setCounties（）和getSelectedCountyData（）函数。

In countyList1.js file I have the setCounties() and getSelectedCountyData() functions.

到目前为止，我可以看到带有县列表的下拉列表。我不知道如何阅读CSV文件并将选定的县过滤器应用于此列表。

So far I can see the dropdown with counties list. I don't know how to read the CSV file and apply the selected county filter to this list.

我尝试了FileReader对象，我可以加载CSV内容网页，但我不希望用户选择CSV。我已经有了数据集。

I tried the FileReader object and I can load the CSV contents on the web page but I don't want the user to select the CSV. I have the dataset already.

我正在尝试使用此SO帖子中的这个jquery.csv-0.71库如何使用javascript从* .CSV文件读取数据？但我需要帮助。

I am trying to use this jquery.csv-0.71 library from this SO post How to read data From *.CSV file using javascript? but I need help.

以下是选择县时调用的代码

Here's the code which gets called when a county is selected

function getSelectedCountyData() {
        cntrySel = document.getElementById('county');
        //selCty = countyList[cntrySel.value];
        handleFiles();
}

function handleFiles() {

    $(document).ready(function () {
        $.ajax({
            type: "GET",
            url: "D:\Docs\Desktop\csvfile.csv",
            dataType: "csv",
            success: function (data) { processData(data); }
        });
    });
}

function processData(allText) {
    var allTextLines = allText.split(/\r\n|\n/);
    var headers = allTextLines[0].split(',');
    var lines = [];

    for (var i = 1; i < allTextLines.length; i++) {
        var data = allTextLines[i].split(',');
        if (data.length == headers.length) {

            var tarr = [];
            for (var j = 0; j < headers.length; j++) {
                tarr.push(headers[j] + ":" + data[j]);
            }
            lines.push(tarr);
        }
    }
    console.log(lines);
    drawOutput(lines);
}

function drawOutput(lines) {
    //Clear previous data
    document.getElementById("output").innerHTML = "";
    var table = document.createElement("table");
    for (var i = 0; i < lines.length; i++) {
        var row = table.insertRow(-1);
        for (var j = 0; j < lines[i].length; j++) {
            var firstNameCell = row.insertCell(-1);
            firstNameCell.appendChild(document.createTextNode(lines[i][j]));
        }
    }
    document.getElementById("output").appendChild(table);
}

推荐答案

我强烈建议调查此插件：

I highly recommend looking into this plugin:

http://github.com / evanplaice / jquery-csv /

我将它用于处理大型CSV文件的项目，并且它可以很好地将CSV解析为数组。您也可以使用它来调用您在代码中指定的本地文件，这样您就不依赖于文件上载。

I used this for a project handling large CSV files and it handles parsing a CSV into an array quite well. You can use this to call a local file that you specify in your code, also, so you are not dependent on a file upload.

上面包含插件后，您可以使用以下内容解析CSV：

Once you include the plugin above, you can essentially parse the CSV using the following:

$.ajax({
    url: "pathto/filename.csv",
    async: false,
    success: function (csvd) {
        data = $.csv.toArrays(csvd);
    },
    dataType: "text",
    complete: function () {
        // call a function on complete 
    }
});

所有内容都将存在于数据数组中，供您操作需要。如果需要，我可以提供更多处理数组数据的例子。

Everything will then live in the array data for you to manipulate as you need. I can provide further examples for handling the array data if you need.

插件页面上有许多很好的例子可以用来做各种各样的事情。

There are a lot of great examples available on the plugin page to do a variety of things, too.

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