From c2fa70ec8503d10b990575a547036bfd70a53825 Mon Sep 17 00:00:00 2001
From: Frederick Muriuki Muriithi
Date: Mon, 13 Jun 2022 15:02:19 +0300
Subject: Add upload progress indicator

---
 qc_app/static/js/upload_progress.js | 92 +++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 qc_app/static/js/upload_progress.js

(limited to 'qc_app/static/js/upload_progress.js')

diff --git a/qc_app/static/js/upload_progress.js b/qc_app/static/js/upload_progress.js
new file mode 100644
index 0000000..d615be4
--- /dev/null
+++ b/qc_app/static/js/upload_progress.js
@@ -0,0 +1,92 @@
+function make_processing_indicator(elt) {
+    var count = 0;
+    return function() {
+	var message = "Checking for errors: "
+	if(count > 5) {
+	    count = 1;
+	}
+	for(i = 0; i < count; i++) {
+	    message = message + ".";
+	}
+	elt.innerHTML = message
+	count = count + 1
+    };
+}
+
+function make_progress_updater(file, indicator_elt) {
+    var progress_bar = indicator_elt.querySelector("#progress-bar");
+    var progress_text = indicator_elt.querySelector("#progress-text");
+    var extra_text = indicator_elt.querySelector("#progress-extra-text");
+    return function(event) {
+	if(event.loaded <= file.size) {
+	    var percent = Math.round((event.loaded / file.size) * 100);
+	    progress_bar.value = percent
+	    progress_text.innerHTML = "Uploading: " + percent + "%";
+	    extra_text.setAttribute("class", "hidden")
+	}
+
+	if(event.loaded == event.total) {
+	    progress_bar.value = 100;
+	    progress_text.innerHTML = "Uploaded: 100%";
+	    extra_text.setAttribute("class", null);
+	    intv = setInterval(make_processing_indicator(extra_text), 400);
+	    setTimeout(function() {clearTimeout(intv);}, 20000);
+	}
+    };
+}
+
+function setup_request(file, progress_indicator_elt) {
+    var request = new XMLHttpRequest();
+    var updater = make_progress_updater(file, progress_indicator_elt);
+    request.upload.addEventListener("progress", updater);
+    request.onload = function(event) {
+	document.location.assign(request.responseURL);
+    };
+    return request;
+}
+
+function selected_filetype(radios) {
+    for(idx = 0; idx < radios.length; idx++) {
+	if(radios[idx].checked) {
+	    return radios[idx].value;
+	}
+    }
+}
+
+function setup_formdata(form) {
+    var formdata = new FormData();
+    formdata.append(
+	"qc_text_file",
+	form.querySelector("input[type='file']").files[0]);
+    formdata.append(
+	"filetype",
+	selected_filetype(
+	    Array.from(form.querySelectorAll("input[type='radio']"))));
+    return formdata;
+}
+
+function upload_data(event) {
+    event.preventDefault();
+
+    var pindicator = document.getElementById("progress-indicator");
+    pindicator.setAttribute("class", "modal");
+
+    var form = document.getElementsByTagName("form")[0]
+    var formdata = setup_formdata(form);
+
+    document.getElementById("progress-filename").innerHTML = (
+	form.querySelector("input[type='file']").files[0].name);
+    var request = setup_request(
+	form.querySelector("input[type='file']").files[0],
+	document.getElementById("progress-indicator"));
+    request.open(form.getAttribute("method"), form.getAttribute("action"));
+    request.send(formdata);
+    return false;
+}
+
+
+function setup_upload_handlers() {
+    console.info("Setting up the upload handlers.")
+    upload_form = document.getElementsByTagName("form")[0];
+    upload_form.addEventListener("submit", upload_data);
+}
-- 
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