Question

我对JSP和javascript很新。我使用javascript计算两个地方之间的距离，并将距离存储在文本框中。 document.getElementById('dist').value = drivingDistanceKilometers;

然而，当我尝试使用String dist = request.getParameter("dist");检索值时，我没有得到任何价值。

我也尝试使用document.location.href = "bookings.jsp?dist="+drivingDistanceKilometers; 这是第一次有效，但是当我再次尝试时，它没有任何价值。

如何解决这个问题？

分享更多代码：

这是在book.jsp

中

使用Javascript：

<script>
var geocoder, location1, location2, gDir;

function initialize() {
    geocoder = new GClientGeocoder();
    gDir = new GDirections();        
}

function showLocation() {
    geocoder.getLocations(document.form2.pickUp.value, function (response) {
        if (!response || response.Status.code != 200)
        {
            alert("Sorry, we were unable to geocode the first address");
        }
        else
        {
            location1 = {lat: response.Placemark[0].Point.coordinates[1], lon: response.Placemark[0].Point.coordinates[0], address: response.Placemark[0].address};
            geocoder.getLocations(document.form2.dropOff.value, function (response) {
                if (!response || response.Status.code != 200)
                {
                    alert("Sorry, we were unable to geocode the second address");
                }
                else
                {
                    location2 = {lat: response.Placemark[0].Point.coordinates[1], lon: response.Placemark[0].Point.coordinates[0], address: response.Placemark[0].address};
                    gDir.load('from: ' + location1.address + ' to: ' + location2.address);
                    calculateDistance();
                }
            });
        }
    });
}

function calculateDistance()
{
    GEvent.addListener(gDir, "load", function() {

        var drivingDistanceKilometers = gDir.getDistance().meters / 1000;
        document.getElementById('dist').value = drivingDistanceKilometers;

    });
}
</script>

HTML：

<body onload="initialize()">

<form name="form2" onSubmit=" showLocation(); " method="post" action="bookings.jsp" >

<input type="text" id="dist" name="dist" value="0" >
<input name="pickUp" type="text">
<input name="dropOff" type="text">
<input type="submit" value="Submit">

</form>
</body>

Inside bookings.jsp：

<body>
<% 
String dist = request.getParameter("dist"); 
out.println(dist);
%>
</body>

Answer 1

您实际上没有名称为dist的输入字段。你需要做的是修改你的html并将其插入你的表格

<input type="hidden" id="dist" name="dist" value="0"/>

所以你的代码可能如下所示：

<form name="form2" onSubmit=" showLocation(); " method="post" action="bookings.jsp" >

<input type="hidden" id="dist"  value="0"/>
<input name="pickUp" type="text">
<input name="dropOff" type="text">
<input type="submit" value="Submit">

</form>

将javascript中设置的参数从一个jsp发送到另一个jsp

1 个答案: