Disable download button when no data is available

relog-web/src/Button.js

@@ -12,7 +12,11 @@ const Button = (props) => {
   }
 
   return (
-    <button className={className} onClick={props.onClick}>
+    <button
+      className={className}
+      onClick={props.onClick}
+      disabled={props.disabled}
+    >
       {tooltip}
       {props.label}
     </button>

relog-web/src/Button.module.css

@@ -60,3 +60,8 @@
   opacity: 100%;
   transition: opacity 0.5s;
 }
+
+.Button:disabled {
+  color: rgba(0, 0, 0, 0.25);
+  cursor: default;
+}

relog-web/src/FileInputRow.js

@@ -31,8 +31,18 @@ const FileInputRow = (props) => {
       <label>{props.label}</label>
       <input type="text" value={props.value} disabled="disabled" />
       <Button label="Upload" kind="inline" onClick={onClickUpload} />
-      <Button label="Download" kind="inline" onClick={props.onDownload} />
+      <Button
-      <Button label="Clear" kind="inline" onClick={props.onClear} />
+        label="Download"
+        kind="inline"
+        onClick={props.onDownload}
+        disabled={props.disableDownload}
+      />
+      <Button
+        label="Clear"
+        kind="inline"
+        onClick={props.onClear}
+        disabled={props.disableClear}
+      />
       <Button label="Template" kind="inline" onClick={props.onTemplate} />
       {tooltip}
       <input

relog-web/src/ProductBlock.js

@@ -91,8 +91,12 @@ const ProductBlock = (props) => {
   };
 
   let description = "Not initially available";
+  let notInitiallyAvailable = true;
   const nCenters = Object.keys(props.value["initial amounts"]).length;
-  if (nCenters > 0) description = `${nCenters} collection centers`;
+  if (nCenters > 0) {
+    description = `${nCenters} collection centers`;
+    notInitiallyAvailable = false;
+  }
 
   return (
     <>
@@ -109,6 +113,8 @@ const ProductBlock = (props) => {
             onDownload={onInitialAmountsDownload}
             onClear={onInitialAmountsClear}
             onTemplate={onInitialAmountsTemplate}
+            disableDownload={notInitiallyAvailable}
+            disableClear={notInitiallyAvailable}
           />
 
           <h1 style={{ display: nCenters == 0 ? "none" : "block" }}>