Adding JavaScript to a sandboxed Visual Web Part seems to work best when using the following script inside the .ascx file: <script type="text/javascript">     SP.SOD.executeFunc("~sitecollection/_catalogs/siteassets/MyWebPart/MyWebPartScript.js", null, LoadMyScript);     //the following two variables keep the page with the web part from freezing and becoming uneditable when in edit mode     var inDesignMode = document.forms[MSOWebPartPageFormName].MSOLayout_InDesignMode.value;     var wikiInEditMode = document.forms[MSOWebPartPageFormName]._wikiPageMode.value;     if […]