Store table query parameters when performing a bootstrap-table query

- For now it only supports .csv format

InvenTree/stock/templates/stock/location.html

@@ -240,12 +240,7 @@
     {% endif %}
 
     $("#stock-export").click(function() {
-
-        exportStock({
-            {% if location %}
-            location: {{ location.pk }}
-            {% endif %}
-        });
+        downloadTableData($('#stock-table'));
     });
 
     $('#location-create').click(function () {

InvenTree/templates/js/translated/tables.js

@@ -7,6 +7,7 @@
 
 /* exported
     customGroupSorter,
+    downloadTableData,
     reloadtable,
     renderLink,
     reloadTableFilters,
@@ -21,6 +22,42 @@ function reloadtable(table) {
 }
 
 
+/**
+ * Download data from a table, via the API.
+ * This requires a number of conditions to be met:
+ * 
+ * - The API endpoint supports data download (on the server side)
+ * - The table is "flat" (does not support multi-level loading, etc)
+ * - The table has been loaded using the inventreeTable() function, not bootstrapTable()
+ *   (Refer to the "reloadTableFilters" function to see why!)
+ */
+function downloadTableData(table) {
+
+    // Extract table configuration options
+    var options = table.bootstrapTable('getOptions');
+
+    var url = options.url;
+
+    if (!url) {
+        console.log("Error: downloadTableData could not find 'url' parameter");
+    }
+
+    var query_params = options.query_params || {};
+
+    url += '?';
+
+    for (const [key, value] of Object.entries(query_params)) {
+        url += `${key}=${value}&`;
+    }
+
+    var format = 'csv';
+
+    url += `export=${format}`;
+
+    location.href = url;
+}
+
+
 /**
  * Render a URL for display
  * @param {String} text 
@@ -114,6 +151,10 @@ function reloadTableFilters(table, filters) {
         }
     }
 
+    // Store the total set of query params
+    // This is necessary for the "downloadTableData" function to work
+    options.query_params = params;
+
     options.queryParams = function(tableParams) {
         return convertQueryParameters(tableParams, params);
     };
@@ -221,7 +262,11 @@ $.fn.inventreeTable = function(options) {
     // Extract query params
     var filters = options.queryParams || options.filters || {};
 
+    // Store the total set of query params
+    options.query_params = filters;
+
     options.queryParams = function(params) {
+        // Update the query parameters callback with the *new* filters
         return convertQueryParameters(params, filters);
     };