267 lines
8.5 KiB
JavaScript
267 lines
8.5 KiB
JavaScript
// Source: https://blog.mounirmesselmeni.de/2012/11/20/reading-csv-file-with-javascript-and-html5-file-api/
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// Source: https://www.js-tutorials.com/javascript-tutorial/reading-csv-file-using-javascript-html5/
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// Source: https://stackoverflow.com/questions/13329853/reading-server-file-with-javascript
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// Source: https://www.w3schools.com/howto/howto_js_sort_table.asp
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// Source: https://stackoverflow.com/questions/19105009/how-to-insert-variables-in-javascript-strings
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window.onload = function() {
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handleFile("resources/world_data_v1.csv");
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};
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function handleFile(path) {
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// Check for the various File API support.
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if (window.FileReader) {
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// FileReader are supported.
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var xmlhttp = new XMLHttpRequest();
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xmlhttp.onreadystatechange = function () {
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if (xmlhttp.status == 200 && xmlhttp.readyState == 4) {
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processData(xmlhttp.responseText, path);
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}
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};
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xmlhttp.open("GET", path, true);
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xmlhttp.send();
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} else {
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alert('FileReader are not supported in this browser.');
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}
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}
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function rerequestFile(path, columns) {
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if (window.FileReader) {
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// FileReader are supported.
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var xmlhttp = new XMLHttpRequest();
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xmlhttp.onreadystatechange = function () {
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if (xmlhttp.status == 200 && xmlhttp.readyState == 4) {
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updateTable(xmlhttp.responseText, columns);
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}
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};
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xmlhttp.open("GET", path, true);
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xmlhttp.send();
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} else {
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alert('FileReader are not supported in this browser.');
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}
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}
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function processData(csv, path) {
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var columnAmount = 7;
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var table = "";
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var checkbox = "";
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// split rows
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var allTextLines = csv.split(/\r\n|\n/);
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// create table header
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table += "<tr>";
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checkbox += "<ul>";
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var data = allTextLines[0].split(",");
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for (var j = 0; j < columnAmount; j++) {
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// create table column header
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table += "<th onclick=\"sortTable(" + j + ")\" >";
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table += stringPerToSlash(data[j]);
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table += ' <i class="fas fa-chevron-up"></i> <i class="fas fa-chevron-down"></i>';
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table += "</th>";
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// create dropdown elements
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checkbox += "<li>";
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checkbox += "<input id='" + data[j] + "' type='checkbox' checked='checked' onclick=\"toggleColumn('" + path + "')\"/>";
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checkbox += data[j];
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checkbox += "</li>";
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}
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checkbox += "</ul>";
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table += "</tr>";
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// create table content
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for (var i = 1; i < allTextLines.length; i++) {
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var data = allTextLines[i].split(',');
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table += "<tr>";
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for (var j = 0; j < columnAmount; j++) {
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table += "<td>";
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table += data[j];
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table += "</td>";
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}
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table += "</tr>";
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}
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document.getElementById('t01').innerHTML = table;
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document.getElementById('options').innerHTML = checkbox;
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}
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function toggleColumn(file) {
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var activated_columns = [];
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/*
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var inner_div = document.getElementById('options').childNodes;
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for (i = 0; i < inner_div.length; i++) {
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var list = inner_div[i].children[0].childNodes;
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for (j = 0; j < list.length; j++) {
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var checkbox = list[j].children[0];
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if (checkbox.checked) {
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activated_columns.push(checkbox.id);
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}
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}
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}
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*/
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var list_elements = document.getElementById('options').children[0].childNodes;
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for (i = 0; i < list_elements.length; i++) {
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var element = list_elements[i];
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var checkbox = element.children[0];
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if (checkbox.checked) {
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activated_columns.push(checkbox.id);
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}
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}
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rerequestFile(file, activated_columns);
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}
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function updateTable(csv, columns) {
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var table = "";
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// split rows
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var allTextLines = csv.split(/\r\n|\n/);
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// create table header
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table += "<tr>";
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var data = allTextLines[0].split(",");
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var discarded_indices = [];
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for (var j = 0; j < data.length; j++) {
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// create table column header
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if (columns.includes(data[j])) {
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table += "<th onclick=\"sortTable(" + j + ")\" >";
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table += data[j];
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table += "</th>";
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} else {
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discarded_indices.push(j);
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}
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}
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// checkbox += "</ul>";
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table += "</tr>";
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// create table content
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for (var i = 1; i < allTextLines.length; i++) {
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var data = allTextLines[i].split(',');
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table += "<tr>";
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for (var j = 0; j < data.length; j++) {
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if (!discarded_indices.includes(j)) {
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table += "<td>";
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table += data[j];
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table += "</td>";
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}
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}
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table += "</tr>";
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}
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document.querySelector('#t01').innerHTML = table;
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}
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function sortTable(n) {
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var table, rows, switching, i, x, y, shouldSwitch, dir, switchcount = 0;
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table = document.getElementById("t01");
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switching = true;
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// Set the sorting direction to ascending:
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dir = "asc";
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/* Make a loop that will continue until
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no switching has been done: */
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while (switching) {
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// Start by saying: no switching is done:
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switching = false;
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rows = table.rows;
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/* Loop through all table rows (except the
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first, which contains table headers): */
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for (i = 1; i < (rows.length - 1); i++) {
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// Start by saying there should be no switching:
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shouldSwitch = false;
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/* Get the two elements you want to compare,
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one from current row and one from the next: */
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x = rows[i].getElementsByTagName("td")[n];
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y = rows[i + 1].getElementsByTagName("td")[n];
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var first_element = x.innerHTML.toLowerCase();
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var second_element = y.innerHTML.toLowerCase();
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/* Check if the two rows should switch place,
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based on the direction, asc or desc: */
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if (dir == "asc") {
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// check if the first element is a number, then assume the
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// second element is also a number
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if (isNaN(first_element)) {
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if (first_element > second_element) {
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// If so, mark as a switch and break the loop:
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shouldSwitch = true;
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break;
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}
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} else {
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if (parseFloat(first_element) > parseFloat(second_element)) {
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// If so, mark as a switch and break the loop:
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shouldSwitch = true;
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break;
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}
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}
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} else if (dir == "desc") {
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// check if the first element is a number, then assume the
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// second element is also a number
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if (isNaN(first_element)) {
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if (first_element < second_element) {
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// If so, mark as a switch and break the loop:
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shouldSwitch = true;
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break;
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}
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} else {
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if (parseFloat(first_element) < parseFloat(second_element)) {
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// If so, mark as a switch and break the loop:
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shouldSwitch = true;
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break;
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}
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}
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}
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}
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if (shouldSwitch) {
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/* If a switch has been marked, make the switch
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and mark that a switch has been done: */
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rows[i].parentNode.insertBefore(rows[i + 1], rows[i]);
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switching = true;
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// Each time a switch is done, increase this count by 1:
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switchcount++;
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} else {
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/* If no switching has been done AND the direction is "asc",
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set the direction to "desc" and run the while loop again. */
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if (switchcount == 0 && dir == "asc") {
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dir = "desc";
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switching = true;
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}
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}
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}
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}
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function stringPerToSlash(columnname) {
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return columnname.includes(" per ") ? columnname.replace(" per ", " / ") : columnname;
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}
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function div_change(strID) {
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document.getElementById(strID).style.display = (document.getElementById(strID).style.display == 'none') ? 'inline-block' : 'none';
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document.getElementById(strID + "_shown").style.display = (document.getElementById(strID + "_shown").style.display == 'none') ? 'inline-block' : 'none';
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document.getElementById(strID + "_hidden").style.display = (document.getElementById(strID + "_hidden").style.display == 'none') ? 'inline-block' : 'none';
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} |