如何从ajax调用返回多个对象（grails）

Question

I have an ajax function which should return a list of objects. I'm sorry for asking this i'm a beginner in grails and web programming

For example my ajax function should return the combination of this

def ajaxFunction= {
    //it should return all the following object
    List<String> stringList = ......
    List<ClassA> classAList = .....
    ClassB objectOfB = ....
    int count = ...
    .
    .
    .
    //I don't know who to return this all... (stringList , classAList , objectOfB ,count)

}

Answer 1

Alternatively you can do this:

def ajaxFunction= {
    //it should return all the following object
    List<String> stringList = ......
    List<ClassA> classAList = .....
    ClassB objectOfB = ....
    int count = ...
    return [stringList:stringList,classAList:classAList,objectOfB:objectOfB,count:count] as JSON

}

Just remember to import the grails converter JSON

Answer 2

I think it better to creat a bean class. like this

class YourBeanClass {
    List<String> stringList;
    List<ClassA> classAList;
    ClassB objectOfB;
    int count;
    .
    .
    .
}

so you can use this bean class and return this bean class

def ajaxFunction= {
    YourBeanClass yourBeanClass = new YourBeanClass();
    yourBeanClass.stringList = ......
    yourBeanClass.classAList = .....
    yourBeanClass.objectOfB = ....
    yourBeanClass.count = ...
    yourBeanClass..
    .
    .

    //you can return/render this yourBeanClass
    return yourBeanClass

}

Answer 3

You can return multiple json objects and parse it at the client side :

List<String> stringList1 =  new ArrayList<String>();
List<String> stringList2 =  new ArrayList<String>();

String json1 = new Gson().toJson(stringList1); 
String json2 = new Gson().toJson(stringList2); 
String bothJson = "["+json1+","+json2+"]"; //Put both objects in an array of 2 elements

return bothJson as JSON

Not tested though.