编辑课程的英文名称时输入框不清空

app/views/layouts/_syllabus_eng_name.html.erb

@@ -4,6 +4,6 @@
     <span style="color: #888">课程英文名称</span>
 <% end %>
 <% if User.current == syllabus.user || User.current.admin? %>
-    <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);",:id => "syllabus_edit_ng_name_png", :style => "width:15px; position:absolute; right: -20px; top: 5px;", :class => "none", :onclick => "show_edit_eng_name();"%>
+    <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);",:id => "syllabus_edit_ng_name_png", :style => "width:15px; position:absolute; right: -20px; top: 5px;", :class => "none", :onclick => "show_edit_eng_name('#{syllabus.eng_name}');"%>
 <% end %>
 </p>

public/javascripts/syllabus.js

@@ -31,10 +31,11 @@ function submit_syllabus() {
 }
 
 //编辑英文名称
-function show_edit_eng_name() {
+function show_edit_eng_name(str) {
     EngEdit = true;
     $("#syllabus_eng_name_show").hide();
     $("#syllabus_eng_name_edit").show();
+    $("#syllabus_eng_name_edit").val(str);
     $("#syllabus_eng_name_edit").focus();
 }