我的代码如下。它将接受来自输入文本的数据;然后它将从谷歌电子表格中的stackoverflow(基于输入)获取最新的提要。
我已经(想要)设置一个外部 gif 图像以在获取 rss 提要及其处理过程中显示为进度指示器。
问题是:当我删除评论部分时;该 gif 图像将永远不会对用户可见,并且当它保留为评论时;该 gif 图像在该过程完成后由应用程序加载,然后在.
我希望它仅在进程(获取 rss 和处理它)正在进行时才可见。那么有没有办法让它成为可能呢?
function stackoverflow(){
var app =UiApp.createApplication().setHeight(380).setWidth(800);
app.setTitle("Enter tag name");
var mydoc=SpreadsheetApp.getActiveSpreadsheet();
var txtBox = app.createTextBox().setFocus(true).setWidth("150").setId("ticker").setName("ticker");
var mainpanel = app.createHorizontalPanel().setId('mainpanel');
mainpanel.add(txtBox);
var subbtn = app.createButton("Get posts!").setId("tick").setWidth("80");
mainpanel.add(subbtn);
var myloadingimg=app.createImage("http://schedule.msu.edu/img/InProgress.gif").setHeight("26").setWidth("26").setId("loadingimg");
mainpanel.add(myloadingimg.setVisible(false));
app.add(mainpanel);
var panel = app.createVerticalPanel().setId('panel');
var submitHandler = app.createServerHandler("clicker").addCallbackElement(mainpanel);
subbtn.addClickHandler(submitHandler);
app.add(panel);
mydoc.show(app);
}
function clicker(e){
var app = UiApp.getActiveApplication();
var txtBox = app.getElementById("ticker");
app.getElementById("loadingimg").setVisible(true);
var panel=app.getElementById("panel");
app.remove(1);
var panel = app.createVerticalPanel().setId('panel');
var stackurl = "http://stackoverflow.com/feeds/tag?tagnames="+e.parameter.ticker+"&sort=newest";
var stackXML = UrlFetchApp.fetch(stackurl).getContentText();
var stackDOC = Xml.parse(stackXML, false);
var stackentry = stackDOC.getElement().getElements('entry');
for (var i = 0; i < stackentry.length; i++) {
var result = stackentry[i];
panel.add(app.createHTML("<br><b>Post Title: </b>"+ result.getElement('title').getText()+"<br>"));
panel.add(app.createAnchor('', '') .setText("Post URL").setHref(result.getElement('link').getAttribute('href').getValue()));
panel.add(app.createHTML("<br>"));
}
var scroll = app.createScrollPanel().setPixelSize(760, 280);
scroll.add(panel);
app.add(scroll);
//app.getElementById("loadingimg").setVisible(false);
return app;
}
function onOpen()
{
var ss = SpreadsheetApp.getActiveSpreadsheet();
var menuEntries = [];
menuEntries.push({name:'stackoverflow',functionName:'stackoverflow'});
ss.addMenu("f2", menuEntries);
}