如何将JavaScript值传递给JSF EL和支持bean？

问题描述

我正在做JSF地理定位服务，我需要将经纬度传递给bean进行处理。 HTML5允许使用JavaScript获取位置信息，例如。
将以下代码放到JSF页面中，显示带有GPS坐标的警报

 您需要认识到，JSF运行在web服务器上，并生成一系列HTML / CSS / JS代码，它们从web服务器发送到webbrowser，并且webbrowser只运行HTML / CSS / JS。在浏览器中右键单击页面，然后选择查看源代码。取代< h：inputText> ，您会看到类似于 
 
 
 < input type =textid =formid：inputid/> 
  
在JS中，您可以使用文档轻松地从HTML DOM中获取HTML元素函数并修改它。
  var input = document.getElementById（'formid：inputid'）; 
 input.value ='new value'; 
  
 
 
 
另请参阅：
 
 
 
 
 
  
 
 
 
I am doing JSF geolocation service where I need to pass latitude and longitude to bean for processing. HTML5 allows getting location with JavaScript, for example like is done in http://code.google.com/p/geo-location-javascript/.Putting following code to JSF page shows alert with GPS coordinates
<script>
    if (geo_position_js.init()) {
        geo_position_js.getCurrentPosition(success_callback,error_callback,{enableHighAccuracy:true,options:5000});
    } else {
        alert("Functionality not available");
    }
    function success_callback(p) {
        alert('lat='+p.coords.latitude.toFixed(2)+';lon='+p.coords.longitude.toFixed(2));
    }

    function error_callback(p) {
        alert('error='+p.message);
    }
</script>
How to use p.coords.latitude.toFixed(2) value to pass it for example to h:inputtext component?
 解决方案 
You need to realize that JSF runs at webserver and produces a bunch of HTML/CSS/JS code which get sent from webserver to webbrowser and that the webbrowser only runs HTML/CSS/JS. Rightclick the page in webbrowser and choose View Source. In place of the <h:inputText> you'll see something like
<input type="text" id="formid:inputid" />
In JS, you can easily grab HTML elements from the HTML DOM using document functions and alter it.
var input = document.getElementById('formid:inputid');
input.value = 'new value';
See also:
Communication between Java/JSP/JSF and JavaScript
                        
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