[英]How to pass javascript variable to java scriplet in jsp
我必須在我的Java腳本中傳遞此processID,以便我可以基於特定的ID查詢數據庫。 processID
來自下拉列表的onchange函數。 但我無法做到這一點。
<script>
function load_division(processID){
var id = processID.toString();
<% String connectionUrl = "jdbc:oracle:thin:@PRA:1540:";
String dbName = "System";
String userId = "Prakhar";
String password = "PS#5QW8";
%>
<% String i%>= id; //giving Error
PreparedStatement statement2 = null;
ResultSet divSet = null;
try {
Connection connection1 = DriverManager.getConnection(
connectionUrl + dbName,
userId,
password
);
statement2 = connection1.prepareStatement(
"SELECT distinct ID, " +
"Name FROM process_group " +
"WHERE ID =" + i +
" ORDER BY name"
);
divSet = statement2.executeQuery();
}
catch (Exception e)
{
e.printStackTrace();
}%>
var x = document.getElementById("division");
var option = document.createElement("option");
var docfrag = document.createDocumentFragment();
<% while (divSet.next()) {
divSet.getInt("ID");%>
docfrag.appendChild(new Option(
"<%=divSet.getString("Name")%>",
"<%=divSet.getInt("ID")%>"
));
x.appendChild(docfrag);
<%}%>
}
</script>
您不能直接進行服務器調用。 您需要發出服務器請求。
javascript在客戶端播放,而JSP在服務器播放。
您需要的是必須發出服務器請求。 並將該字符串作為查詢參數發送。
實現此目的的兩個選擇。
HTML表格
Sample.html
<form action="SimpleFormHandler.jsp" method="get"> Name: <input type="text" name="firstName"> <input type="text" name="lastName"><br> Sex: <input type="radio" checked name="sex" value="male">Male <input type="radio" name="sex" value="female">Female <p> What Java primitive type best describes your personality: <select name="javaType"> <option value="boolean">boolean</option> <option value="byte">byte</option> <option value="char" selected>char</option> <option value="double">double</option> <option value="float">float</option> <option value="int">int</option> <option value="long">long</option> </select> <br> <input type="submit"> </form> </body> </html>
SampleFormHandler.jsp
<html>
<body>
<%
// Grab the variables from the form.
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
String sex = request.getParameter("sex");
String javaType = request.getParameter("javaType");
%>
<%-- Print out the variables. --%>
<h1>Hello, <%=firstName%> <%=lastName%>!</h1>
I see that you are <%=sex%>. You know, you remind me of a
<%=javaType%> variable I once knew.
</body>
</html>
使用post發送數據並將結果放入div
$.ajax({
url: "/YourServlet",
type: "post",
data: values,
success: function(){
alert("success");
$("#result").html('submitted successfully');
},
error:function(){
alert("failure");
$("#result").html('there is error while submit');
}
});
不要混淆JSP和Java腳本存在於同一文檔(或文件)上。 是的,但是JSP部分在服務器端編譯,JavaScript由瀏覽器執行。
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