6f41c6a196697c175a2cf5abcbd247ba24a2fe8e
jcasper
  Mon Jun 15 09:22:37 2026 -0700
Loading spinner for faceted composites (the page must first do the ajax metadata
fetch, then process the result with dataTables). refs #36320

diff --git src/hg/htdocs/style/facetedComposite.css src/hg/htdocs/style/facetedComposite.css
index 3802075d011..de4f4222cb7 100644
--- src/hg/htdocs/style/facetedComposite.css
+++ src/hg/htdocs/style/facetedComposite.css
@@ -1,215 +1,236 @@
 /* SPDX-License-Identifier: MIT; (c) 2025 Andrew D Smith (author) */
+/* Loading indicator shown while metadata is fetched and the table is built */
+#faceted-loading {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 0.75em;
+    padding: 3em 0;
+    color: #555;
+}
+#faceted-loading .faceted-spinner {
+    width: 36px;
+    height: 36px;
+    border: 4px solid #d3eaff;     /* matches the table's light-blue accents */
+    border-top-color: #2b6cb0;
+    border-radius: 50%;
+    animation: faceted-spin 0.8s linear infinite;
+}
+@keyframes faceted-spin {
+    to { transform: rotate(360deg); }
+}
 #container {
     display: flex;
     width: 100%;
     gap: 1em;
     align-items: flex-start;
     box-sizing: border-box;
 }
 #filters {
     display: flex;
     flex-direction: column;
     gap: 1em;
     width: 300px;
     flex-shrink: 0;
     /* ADS: the lines below are for vertical scrolling if needed */
     /* max-height: 80vh; */
     /* overflow-y: auto; */
     align-self: stretch;
     box-sizing: border-box;
     padding-right: 0.5em;
 }
 #filters > div {
     display: flex;
     flex-direction: column;
     gap: 0.3em;
 }
 #filters label {
     display: flex;
     align-items: center;
     gap: 0.3em;
     cursor: pointer;
     user-select: none;
 }
 #theMetaDataTable_wrapper {
     flex: 1 1 auto;
     min-width: 0;
     box-sizing: border-box;
 }
 /*  Horizontal-scroll box around metadata tables: a too-wide table scrolls
     internally in this instead of spilling off-screen. The toolbar (Show N, paging)
     sits outside this box, so it stays visible at the wrapper's width.
 
     The genome browser page wraps this content in an old-school
     <table width="100%"> that sizes to its content. The "width: 0; min-width: 100%"
     pair stops the metadata table from reporting the (very large) content width,
     the outer table sticks to the page width, the metadata table's min-width:100% makes
     it expand to fill that, and then then metadata's overflow results in a scroll bar.
 */
 .table-xscroll {
     width: 0;
     min-width: 100%;
     overflow-x: auto;
 }
 #theMetaDataTable {
     width: 100% !important;
     box-sizing: border-box;
     box-shadow: 0 0 0 1px #ddd;
 }
 /* Light blue background for the table header (column titles + search row) */
 #theMetaDataTable thead th,
 #theMetaDataTable thead td {
     background-color: lightblue;
 }
 #theMetaDataTable td:nth-child(n+2),
 #theMetaDataTable th:nth-child(n+2) {
     vertical-align: top;
     /* white-space: nowrap; */
     /* overflow: hidden;          /* hide overflow */
     min-width: 100px; /* Adjust width as needed */
 }
 /* Override Select 3.0's custom checkbox styling to use native appearance */
 table.dataTable input.dt-select-checkbox {
     appearance: auto;
     width: auto;
     height: auto;
 }
 table.dataTable input.dt-select-checkbox:checked::after,
 table.dataTable input.dt-select-checkbox:indeterminate::after {
     display: none;
 }
 #theMetaDataTable input.row-select {
     /* additional checkbox styling */
 }
 table.dataTable {
     width: 100%;
     border-collapse: collapse;
     table-layout: auto;
 }
 table.dataTable tbody tr:nth-child(odd) {
     background-color: #f0f0f0;
 }
 table.dataTable tbody tr:nth-child(even) {
     background-color: #ffffff;
 }
 table.dataTable tbody tr:hover {
     background-color: #d3eaff; /* Light blue on hover */
 }
 .color-box {
     display: inline-block;
     width: 1em;
     height: 1em;
     vertical-align: middle;
     /* background-color set dynamically in JS */
 }
 
 .facet-heading {
     cursor: pointer;
     user-select: none;
 }
 .facet-heading::after {
     content: "  ❯";
     margin-left: 0.3em;
     display: inline-block;
     transition: transform 0.2s;
     transform: rotate(90deg);   /* points down = expanded */
 }
 .facet-heading.collapsed::after {
     transform: rotate(0deg);    /* points right = collapsed */
 }
 .facet-body {
     display: flex;
     flex-direction: column;
     gap: 0.3em;
 }
 .facet-body.collapsed {
     display: none;
 }
 
 /* "All / Selected" segmented tabs in the toolbar */
 #selected-filter {
     display: inline-flex;
     align-items: stretch;
     order: -1;       /* sit at the left edge, ahead of the page-length dropdown */
 }
 /* Top toolbar: both the page-length dropdown and the "show only selected"
    toggle live inside .dt-length (the toggle is appended there in
    facetedComposite.js). Stretch the cell full width and push the two
    children apart: toggle on the left (via order: -1 above), dropdown right. */
 #theMetaDataTable_wrapper .dt-layout-start:has(.dt-length) {
     flex: 1 1 auto;
 }
 .dt-length {
     display: flex !important;
     width: 100%;
     align-items: center;
     justify-content: space-between;
 }
 
 /* Tab-like blocks for the "All / Selected" selection filter */
 .filter-tab {
     border: 1px solid #aaa;
     background-color: #f0f0f0;
     color: #333;
     padding: 0.3em 0.9em;
     font-size: 0.9em;
     cursor: pointer;
     user-select: none;
     transition: background-color 0.15s;
 }
 .filter-tab:first-of-type {
     border-radius: 4px 0 0 4px;
     border-right: none;   /* avoid a doubled border between the two tabs */
 }
 .filter-tab:last-of-type {
     border-radius: 0 4px 4px 0;
 }
 .filter-tab:hover {
     background-color: #e3e3e3;
 }
 .filter-tab.active {
     background-color: lightblue;   /* matches the table header band */
     color: #000;
     font-weight: bold;
 }
 
 /* Active filter chips bar */
 #active-filters {
     display: flex;
     flex-wrap: wrap;
     align-items: center;
     justify-content: flex-start;
     text-align: left;
     gap: 0.4em;
     padding: 0.5em 0;
     border-top: 1px solid #ddd;
     margin-top: 0.75em;
     width: 100%;
 }
 .filter-chip-group-label {
     font-weight: bold;
     font-size: 0.85em;
     margin-left: 0.3em;
 }
 .filter-chip {
     display: inline-flex;
     align-items: center;
     background-color: #e8f0fe;
     border: 1px solid #c2d6f2;
     border-radius: 12px;
     padding: 0.15em 0.5em;
     font-size: 0.85em;
     white-space: nowrap;
 }
 .filter-chip .remove-chip {
     background: none;
     border: none;
     cursor: pointer;
     font-size: 1em;
     line-height: 1;
     padding: 0 0 0 0.25em;
     color: #666;
 }
 .filter-chip .remove-chip:hover {
     color: #c00;
 }