我创建了一个下拉框，其中包含过滤图像的效果。
我希望下拉1使用java脚本链接到下拉2框。
下拉列表1的HTML代码是：
<select id="areaImageEffects" onchange="" style="height: 30px;">
<option value="Grayscale">Grayscale</option>
<option value="Threshold"> Threshold</option>
</select>
下拉列表2的Html代码是：
<select id="ImageEffectsProperties" onchange="" style="height: 30px;">
<option value="Greyscale1">Greyscale1</option>
<option value="Greyscale2">Greyscale2</option>
</select>
有人可以帮助我使用Javascript将两个下拉列表链接在一起，这样当我在下拉列表中进行选择时，应该会出现下拉列表2。
答案 0 :(得分：0)
通过public class TestAut {
private static final File DB_PATH = new File("databases/demo.db");
private static GraphDatabaseService graphDb;
private static String [] r1={"PARTNERS_JV_WITH","EXEC_JOINS","EXEC_QUITS","INVESTS_IN_TECH_IP","ACQUIRES","LAUNCHES_NEW_PRODUCT_SERVICE","LAUNCHES",
"ACQUIRE_TALENT","DOWNSIZES_TALENT","ENTER_NEW_MARKET","DELIVERS_VALUE","OPENS_NEW_CENTER"};
private static String [] r2={"PARTNERS_JV_WITH","EXEC_JOINS","EXEC_QUITS","INVESTS_IN_TECH_IP","ACQUIRES","LAUNCHES_NEW_PRODUCT_SERVICE","LAUNCHES",
"ACQUIRE_TALENT","DOWNSIZES_TALENT","ENTER_NEW_MARKET","DELIVERS_VALUE","OPENS_NEW_CENTER"};
private static Relations relations;
public static void main(String args[]) {//throws FileNotFoundException {
String fileName = "relations.xls";
Workbook workbook;
startDb();
relations=new Relations(r1,r2);
System.out.println (fileName);
BufferedReader br;
try {
br = new BufferedReader( new InputStreamReader( new FileInputStream(fileName)));
br.close();
workbook = Workbook.getWorkbook(new File(fileName));
for(int i=0;i<workbook.getNumberOfSheets();i++) {
Sheet sheet=workbook.getSheet(i);
for(int j=0;j<sheet.getRows();j++) {
Cell cell[]=sheet.getRow(j);
for(int k=0;k<cell.length;k++)
System.out.print(cell[k].getContents()+" ");
System.out.print("\n");
createNodesAndRelationship(cell[0].getContents(),cell[1].getContents(),
cell[2].getContents(),cell[3].getContents(),
cell[4].getContents(),cell[5].getContents(),cell[6].getContents(),cell[7].getContents());
}
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (BiffException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
stopDb();
System.out.println("Done!!");
successfully.... ");
}
public static void startDb() {
graphDb = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);
}
public static void stopDb() {
graphDb.shutdown();
}
public static void createNodesAndRelationship(String subject,String subjecttype,String object,
String objecttype,String relationship,String headline,String newslink,String date) {
Transaction tx = graphDb.beginTx();
try
{
Result result;
result=graphDb.execute("match ("+subjecttype+"{name:\""+subject+"\"}) return "+subjecttype+".name;");
if(result.toString().equals("empty iterator")) {
//Query="create (a:"+subjecttype+"{name:\""+subject+"\"}) return a;";
result=graphDb.execute("create (a:"+subjecttype+"{name:\""+subject+"\"}) return a;");
System.out.println(result.toString());
}
//Query="match ("+objecttype+"{name:\""+object+"\"}) return "+objecttype+".name;";
result=graphDb.execute("match ("+objecttype+"{name:\""+object+"\"}) return "+objecttype+".name;");
if(result.toString().equals("empty iterator")) {
result=graphDb.execute("create (a:"+objecttype+"{name:\""+object+"\"}) return a;");
System.out.println(result.toString());
}
result=graphDb.execute("match (a:"+subjecttype+"{name:\""+subject+"\"}) "
+ "match(b:"+objecttype+"{name:\""+object+"\"}) "
+ "match (a)-[:"+relationship+"]->"
+ "(b) return a.name,b.name;");
if(result.toString().equals("empty iterator")&&relations.contains(relationship)) {
result=graphDb.execute("match (a:"+subjecttype+"{name:\""+subject+"\"}) "
+ "match(b:"+objecttype+"{name:\""+object+"\"}) "
+ "create (a)-[r:"+relationship+"{headlines:\""+
headline+"\",newslink:\""+newslink+ "\",date:\""+date+"\""+ "}]->(b) return r;");
System.out.println(result.toString());
}
tx.success();
}
finally {
tx.close();
}
}
}
事件调用函数，onchange
并编写以下脚本。
onchange = "myFunction()"