“So erstellen Sie Optionswertwerte in HTML Räume” Code-Antworten

So erstellen Sie Optionswertwerte in HTML Räume

You should wrap value of attribute value in quote(Quote It). If you do 
not wrap them in quote then value after space will be considered as 
attribute itself:

$("#<%=listBrand.ClientID%>").append("<option value='"+ item.Brand + "'>" + item.Brand + "</option>");