Assign Values To Session In The Report To Realize Parameter Sharing

If there are several different reports, each report has a common item to choose from, such as date and time. We hope that after selecting the time of the first report, the default time of other reports will become the time selected by the first report. How to achieve this?

It can be achieved by assigning a value to the Session. Add a post-editing event that passes the value to the back-end servlet through the URL of AJAX to the parameter control of the first report. The servlet obtains the value passed by AJAX and saves it in the Session. The subsequent reports get the control value of the parameter. The Session value is sufficient.

1. AJAX pass value setting

Just open a template with parameters, such as opening the template:%FR_HOME%\webapps\webroot\WEB-INF\reportlets\doc-EN\Primary\Parameter\Template_Parameter.cpt.

Click on the parameter interface, set the control as a text control, and add post-editing events to the text control. The specific JavaScript code is as follows:

var str=this.getValue();    //Get the value of the current control
FR.ajax({  
   url: "/webroot/session/report?id="+encodeURIComponent(str)  //Pass the value to the Session Servlet
});

Note: If you want to preview the report and write the data to the Session without asynchronous loading, you can add async:false under AJAX.

The detailed settings are shown in the figure below:

2. Get the value and save it to the Session

Create a new class named Session, the specific code is detailed in:

https://git.fanruan.com/demo/example/src/release/10.0/src/main/java/com/fr/data/session.java

Compile the session.java class and place the compiled session.class in the%FR _HOME%\webapps\webroot\WEB-INF\classes\com\fr\datadirectory.

3. Configure the servlet that accesses the session assignment

In the newly created web.xml under%FR _HOME%\webroot\WEB-INF\, add the following code:

<?xml version="1.0" encoding="UTF-8"?>
<web-app
   xmlns="http://java.sun.com/xml/ns/j2ee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
   version="2.4">
  <display-name>Template WebApp</display-name>
    <mime-mapping>
  <extension>msi</extension>
  <mime-type>application/x-msi</mime-type>
  </mime-mapping>
  <servlet>
    <servlet-name>session</servlet-name>
    <servlet-class>com.fr.data.session</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>session</servlet-name>
    <url-pattern>/session/*</url-pattern>
  </servlet-mapping>
</web-app>

Note: When writing a Java class file, if it is saved under a specific package, for example, under com/fr/data, in addition to placing the class file under the corresponding location, the content in the web.xml file The servlet-class tag also needs to be modified, for example, to com.fr.data.session.

4. Get Session value

In another parameter template such as%FR_HOME%\webapps\webroot\WEB-INF\reportlets\doc-EN\Primary\Parameter\Dataset_Parameter.cptDelete the default value of the regional parameter in the data set, and select the formula in the control value of the parameter control and enter$sessionname(The name of the Session in the Servlet).As shown below:

Note: sessionname refers to the sessionname in the Java class.

5. Effect view

Since the built-in designer Tomcat does not read web.xml now, the project needs to be deployed to the external Tomcat.

Data Entry Preview Template_Parameter.cpt, enter China in the text box, and then preview Dataset_Parameter.cpt, you can see that China is displayed in the text box, as shown in the figure below: