使用动态创建的元素选择检票口中下拉框的元素
如何在下拉框中自动选择我正在创建和添加的元素？ 下面的代码创建下拉框，我想选择与 ExportConfiguration 对象中的 LanguageFormat 属性相对应的项目。
编辑：我接受的答案让我走上了正确的道路。我必须在值列表中声明该属性，这会导致它自动分配。谢谢！
(Solution)
values.put(
"exportConfigurationLanguageFormat",exportConfiguration.getLanguageFormat());
(/Solution)
//Language Format choices
ArrayList<String> languageFormatArray = new ArrayList<String>();
languageFormatArray.add(firstLanguage);
languageFormatArray.add(firstLanguage + "-" + firstLanguage.toUpperCase());
languageFormatArray.add(firstLanguage + "_" + firstLanguage.toUpperCase());
exportConfigurationLanguageFormat = new DropDownChoice<String>(
"exportConfigurationLanguageFormat", new PropertyModel<String>
(values, "exportConfigurationLanguageFormat"), languageFormatArray);
exportConfigurationLanguageFormat.setRequired(true);
exportConfigurationLanguageFormatFeedback.add(exportConfigurationLanguageFormat);
How can I automatically select an element in my dropdown box that I'm creating and adding?
The code below creates the dropdown box, I would like to select the item that corresponds to the LanguageFormat property in my ExportConfiguration object.
Edit: The answer I've accepted turned me on to the right track. I had to declare the property in the values list which caused it to automatically be assigned. Thanks!
(Solution)
values.put(
"exportConfigurationLanguageFormat",exportConfiguration.getLanguageFormat());
(/Solution)
//Language Format choices
ArrayList<String> languageFormatArray = new ArrayList<String>();
languageFormatArray.add(firstLanguage);
languageFormatArray.add(firstLanguage + "-" + firstLanguage.toUpperCase());
languageFormatArray.add(firstLanguage + "_" + firstLanguage.toUpperCase());
exportConfigurationLanguageFormat = new DropDownChoice<String>(
"exportConfigurationLanguageFormat", new PropertyModel<String>
(values, "exportConfigurationLanguageFormat"), languageFormatArray);
exportConfigurationLanguageFormat.setRequired(true);
exportConfigurationLanguageFormatFeedback.add(exportConfigurationLanguageFormat);
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评论（2）
正如 @andypandy 已经指出的，
DropDownChoice将检索/存储与该属性相关的值values对象的exportConfigurationLanguageFormat。确保它已经有一个值，同样重要的是，确保它的值是
DropDownChoice选项中的值之一。实际上，如果它们的equals()返回 true，那么 id 就足够了。As @andypandy already pointed out, the
DropDownChoicewill be retrieveing/storing its value in relation to the propertyexportConfigurationLanguageFormatof thevaluesobject.Make sure it already has a value, and also important, make sure that its value is one of the values in the
DropDownChoice's choices. Actually id should be sufficient if theirequals()returns true.如果在呈现页面时
values对象的exportConfigurationLanguageFormat属性与languageFormatArray中的条目之一匹配，则应自动发生这种情况。我建议检查 languageFormatArray.contains(values.getExportConfigurationLanguageFormat()) 。
This should occur automatically if the
exportConfigurationLanguageFormatproperty of thevaluesobject matches one of the entries inlanguageFormatArraywhen the page is rendered.I would suggest checking that
languageFormatArray.contains(values.getExportConfigurationLanguageFormat()).