Question

我是新角色如何使用自定义验证来验证多个checkbox的数组，我希望在button选中checkbox之前禁用import org.jsoup.Connection; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.select.Elements; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import static java.net.URLEncoder.encode; public class Main { public static void main(String[] args) throws IOException { PrintWriter pw = new PrintWriter(new File("Participants.csv"), "windows-1251"); final String colNames = "Name;Country;Address;Phone;Fax;Site;Descr"; StringBuilder builder = new StringBuilder(); builder.append(colNames + "\n"); final String url = "http://www.world-food.ru/ru-RU/about/exhibitor-list.aspx"; String userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36"; Connection.Response response = Jsoup.connect(url).execute(); Document document = response.parse(); String viewState = encode(document.getElementById("__VIEWSTATE").attr("value"), "UTF-8"); String eventTarget = encode("p$lt$ctl12$pageplaceholder$p$lt$ctl01$UniPager$pagerElem" , "UTF-8"); for (int i = 1; i <=71 ; i++) { document = Jsoup.connect(url).userAgent(userAgent) .requestBody( String.format( "__EVENTTARGET=%s" + "&__EVENTARGUMENT=%d" + "&__VIEWSTATE=%s", eventTarget, i , viewState )) .cookies(response.cookies()) .post(); Elements subList = document.getElementsByClass("name showframe"); for (int j = 0; j < subList.size(); j++) { Document compPage = Jsoup.connect(subList.get(j).absUrl("href")).post(); Elements compPageData = compPage.getElementsByClass("name"); builder.append(subList.get(j).html().replace(';',',') + ";"); // System.out.println(subList.get(j).html().replace(';',',') + ";"); builder.append(subList.get(j).siblingElements().first().text()+ ";"); // System.out.println(subList.get(j).siblingElements().first().text()+ ";"); for (int k = 0; k <compPageData.size() ; k++) { builder.append(compPageData.get(k).siblingElements().text().replace(';', ',') + ";"); // System.out.print(compPageData.get(k).siblingElements().text().replace(';', ',') + ";"); } builder.append('\n'); } } pw.write(builder.toString()); pw.close(); } }。

Answer 1

您必须订阅您的复选框控件并在其值更改时对其作出反应（启用/禁用按钮）。类似的东西：

this.myForm.controls.isEnableCheckbox.valueChanges
.subscribe(checked => {
  if(checked){ // here you enable or disable the button or you can set a variable to do that...
    this.myForm.controls.buttonToEnable.enable(); 
  } else {
    this.myForm.controls.buttonToEnable.disable();
  }
});

如何使用角度2验证多个复选框

1 个答案: