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authorFrederick Muriuki Muriithi2023-12-07 12:40:37 +0300
committerFrederick Muriuki Muriithi2023-12-07 12:40:37 +0300
commit8760d188faebe552028f3142a821d0851df4e1e9 (patch)
treedc56fe37d79685c1107765d80ffe78085c7df7f1 /qc_app/static/js/upload_samples.js
parent493f8fbe747650a4fbac2e0b153ad0074b4f91e4 (diff)
downloadgn-uploader-8760d188faebe552028f3142a821d0851df4e1e9.tar.gz
Samples: Provide preview feature.
Diffstat (limited to 'qc_app/static/js/upload_samples.js')
-rw-r--r--qc_app/static/js/upload_samples.js132
1 files changed, 132 insertions, 0 deletions
diff --git a/qc_app/static/js/upload_samples.js b/qc_app/static/js/upload_samples.js
new file mode 100644
index 0000000..aed536f
--- /dev/null
+++ b/qc_app/static/js/upload_samples.js
@@ -0,0 +1,132 @@
+/*
+ * Read the file content and set the `data-preview-content` attribute on the
+ * file element
+ */
+function read_first_n_lines(event,
+ fileelement,
+ numlines,
+ firstlineheading = true) {
+ var thefile = fileelement.files[0];
+ var reader = new FileReader();
+ reader.addEventListener("load", (event) => {
+ var filecontent = event.target.result.split(
+ "\n").slice(
+ 0, (numlines + (firstlineheading ? 1 : 0))).map(
+ (line) => {return line.trim("\r");});
+ fileelement.setAttribute(
+ "data-preview-content", JSON.stringify(filecontent));
+ display_preview(event);
+ })
+ reader.readAsText(thefile);
+}
+
+function remove_rows(preview_table) {
+ var table_body = preview_table.getElementsByTagName("tbody")[0];
+ while(table_body.children.length > 0) {
+ table_body.removeChild(table_body.children.item(0));
+ }
+}
+
+/*
+ * Display error row
+ */
+function display_error_row(preview_table, error_message) {
+ remove_rows(preview_table);
+ row = document.createElement("tr");
+ cell = document.createElement("td");
+ cell.setAttribute("colspan", 4);
+ cell.innerHTML = error_message;
+ row.appendChild(cell);
+ preview_table.getElementsByTagName("tbody")[0].appendChild(row);
+}
+
+function strip(str, chars) {
+ var end = str.length;
+ var start = 0
+ for(var j = str.length; j > 0; j--) {
+ if(!chars.includes(str[j - 1])) {
+ break;
+ }
+ end = end - 1;
+ }
+ for(var i = 0; i < end; i++) {
+ if(!chars.includes(str[i])) {
+ break;
+ }
+ start = start + 1;
+ }
+ return str.slice(start, end);
+}
+
+function process_preview_data(preview_data, separator, delimiter) {
+ return preview_data.map((line) => {
+ return line.split(separator).map((field) => {
+ return strip(field, delimiter);
+ });
+ });
+}
+
+function render_preview(preview_table, preview_data) {
+ remove_rows(preview_table);
+ var table_body = preview_table.getElementsByTagName("tbody")[0];
+ preview_data.forEach((line) => {
+ var row = document.createElement("tr");
+ line.forEach((field) => {
+ var cell = document.createElement("td");
+ cell.innerHTML = field;
+ row.appendChild(cell);
+ });
+ table_body.appendChild(row);
+ });
+}
+
+/*
+ * Display a preview of the data, relying on the user's selection.
+ */
+function display_preview(event) {
+ var data_preview_table = document.getElementById("tbl:samples-preview");
+ remove_rows(data_preview_table);
+
+ var separator = document.getElementById("select:separator").value;
+ if(separator === "other") {
+ separator = document.getElementById("txt:separator").value;
+ }
+ if(separator == "") {
+ display_error_row(data_preview_table, "Please provide a separator.");
+ return false;
+ }
+
+ var delimiter = document.getElementById("txt:delimiter").value;
+
+ var firstlineheading = document.getElementById("chk:heading").checked;
+
+ var fileelement = document.getElementById("file:samples");
+ var preview_data = JSON.parse(
+ fileelement.getAttribute("data-preview-content") || "[]");
+ if(preview_data.length == 0) {
+ display_error_row(
+ data_preview_table,
+ "No file data to preview. Check that file is provided.");
+ }
+
+ render_preview(data_preview_table, process_preview_data(
+ preview_data.slice(0 + (firstlineheading ? 1 : 0)),
+ separator,
+ delimiter));
+}
+
+document.getElementById("chk:heading").addEventListener(
+ "change", display_preview);
+document.getElementById("select:separator").addEventListener(
+ "change", display_preview);
+document.getElementById("txt:separator").addEventListener(
+ "keyup", display_preview);
+document.getElementById("txt:delimiter").addEventListener(
+ "keyup", display_preview);
+document.getElementById("file:samples").addEventListener(
+ "change", (event) => {
+ read_first_n_lines(event,
+ document.getElementById("file:samples"),
+ 30,
+ document.getElementById("chk:heading").checked);
+ });