Joget自动补全（Multi Selectbox）不支持placeholder，并且空选项的标签也无法显示。可通过以下脚本实现提示效果
脚本
<script type="text/javascript">
$(function(){
var itRepresentative_chosen = $("#itRepresentative_chosen");
var itRepresentativeText_chosen = itRepresentative_chosen.children('a').children('span:first');
itRepresentativeText_chosen.text('e.g. Who in IS&T have you previously discussed with');
var itRepresentative = $("#itRepresentative");
itRepresentative.change(function(){
var value = $(this).val();
if(value == ""){
itRepresentativeText_chosen.text('e.g. Who in IS&T have you previously discussed with');
}
})
})
</script>
效果
