Question

我看到了很多例子并做了同样的事情，但我无法用JavaScript设置价值。

有我的代码

<h:form id="listPlacesForm">
  <h:inputHidden id="hiddenMapCenter" value="#{userPlaces.center}" />
</h:form>

和JavaScript

if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(findPosition);
} else
    error('Geo Location is not supported');

function findPosition(position) {
    var lat = position.coords.latitude;
    var lng = position.coords.longitude;
    alert('Start')
    var str = lat + ", " + lng;
    var elem = document.getElementById('listPlacesForm:hiddenMapCenter')
    alert(str)
    elem.value = 'asfsf'
    alert('It works!' + str);
}

除了行elem.value = 'asfsf'之外，所有这些代码都有效我尝试过：elem.value = 'sfd'，elem.value = "asfd"，elem.value = str

有什么想法吗？

更新1
生成的HTML

<form id="mainTabId:listPlacesForm" 
      name="mainTabId:listPlacesForm" method="post"
      action="/DarkComm/app/settings?execution=e3s1" enctype="application/x-www-form-urlencoded">
      <input type="hidden" name="mainTabId:listPlacesForm" value="mainTabId:listPlacesForm" />
      <input id="mainTabId:listPlacesForm:hiddenMapCenter"
             type="hidden"          
             name="mainTabId:listPlacesForm:hiddenMapCenter" value="" />
    <input type="hidden"   name="javax.faces.ViewState"
           id="javax.faces.ViewState" value="e3s1" />
</form>

Answer 1

改变这个：

      var elem = document.getElementById('listPlacesForm:hiddenMapCenter')

对此：

      var elem = document.getElementById('hiddenMapCenter')

为什么JavaScript没有设置h：inputHidden值？

1 个答案: