Question

所以

我有一个包含State和City值的ArrayList，并且我必须检查state是否等于某个变量，让我们将其称为“ var1”，如果此状态等于，我必须获取城市名字...

我正在创建菜单过滤器。

<div class="col-md-3">
    <label>#{msg['state']}</label>
    <h:selectOneMenu id="mdl-state" value="#{saisReportQueryBean.keyState}" class="form-control">
        <f:ajax listener="#{saisReportQueryBean.Teste()}"/> 
        <f:selectItem itemValue="#{null}" itemLabel="#{msg['select_state']}" noSelectionOption="true" />
        <f:selectItems value="#{saisReportQueryBean.keyState}" var="estado" itemValue="#{estado}" itemLabel="#{estado}" />
    </h:selectOneMenu>
</div>
<div class="col-md-3">
    <label>#{msg['city']}</label>
    <h:selectOneMenu id="mdl-city" value="#{saisReportQueryBean.keyCity}" class="form-control">
        <f:selectItem itemValue="#{null}" itemLabel="#{msg['select_city']}" noSelectionOption="true" />
        <f:selectItems value="#{saisReportQueryBean.keyCity}" var="cidade" itemValue="#{cidade}" itemLabel="#{cidade}" />
    </h:selectOneMenu>
</div>


When I select the state, I've to update my city itens with just only city in references with the state selected.

Here is my java code.:

protected void updateData() {
        this.reportQuery = new SaisReportQuery();
        this.queryExecuted = false;
        cidades = cidadesIbgeBeanRemote.findAll();
        cidades.sort((f1, f2) -> f1.getMunicipio().compareTo(f2.getMunicipio()));
        Map<String, List<CidadeIbge>> estados = cidades.stream().collect(Collectors.groupingBy(CidadeIbge::getUf));
        setKeyState(estados.keySet());
        getKeyState().toString();
        System.out.println(keyState);       
    }

Tks。

Answer 1

对不起我所有未完成的问题。

我的意思是，当我在菜单中选择某个值时，这必须更改另一个菜单中具有参考值的值：

前端实现：

<h:panelGroup layout="block" class="col-md-3" id="panel-state">
<label>#{msg['state']}</label>

<h:selectOneMenu id="mdl-state" value="#{saisReportQueryBean.reportQuery.state}" binding="#{uf}" class="form-control input_no_round_corner">
<f:selectItem itemValue="#{null}" itemLabel="#{msg['select_state']}" noSelectionOption="true" />
<f:selectItems value="#{saisReportQueryBean.keyState}" var="estado" itemValue="#{estado}" itemLabel="#{estado}" />
<f:ajax listener="#{saisReportQueryBean.UpdateCityByState(uf.value)}" render=":panel-city" event="change" execute="@this" onevent="initializeChosenFieldsCity">
</f:ajax>
</h:selectOneMenu>
</h:panelGroup>
<h:panelGroup layout="block" class="col-md-3" id="panel-city">
<label>#{msg['city']}</label>
<h:selectOneMenu id="mdl-city" value="#{saisReportQueryBean.listCidades}" class="form-control input_no_round_corner">
<f:selectItem itemValue="#{null}" itemLabel="#{msg['select_city']}" noSelectionOption="true" />
<f:selectItems value="#{saisReportQueryBean.listCidades}" var="cidade" itemValue="#{cidade.municipio}" itemLabel="#{cidade.municipio}" />
</h:selectOneMenu>
</h:panelGroup>

回溯实施：

cidades = cidadesIbgeBeanRemote.findAll();


setKeyState(new ArrayList(estados.keySet()));
getKeyState().toString();
getKeyState().sort((f1, f2) -> f1.compareTo(f2));

在Java中按州过滤城市-使用数组

1 个答案: