javascript - 如何从JavaScript访问Grails对象的Arraylist

Question

我的grails Controller MyController.groovy具有以下操作:

def index = {   
    def myModel = new MyModel()
    // res below is a list of MyChild objects from a service call
    def childList = jacksonObjectMapper.readValue(res, new TypeReference<List<MyChild>>() {})
    myModel.setMyChildList(childList)

    render(view: 'index', model: [myModelInstance: myModel])
}

这使index.gsp可以通过myModel访问myModelInstance。

在index.gsp中，我有一个javascript方法，如下所示:

<g:javascript>
    function someJavascriptFunction(){
        var message = $.parseJSON("${myModelInstance.myChildList as grails.converters.JSON}");
        console.log("I am from grails: "+message);
    }
</g:javascript>

考虑到列表中有两个元素，将输出:

I am from grails: [object Object],[object Object]

但这不是我想要的。如何访问列表中的MyChild对象以及javascript函数中这些MyChild对象中的属性/值？

Answer 1

在Groovy和JS代码中进行一些修改。

def index = {   
                    def myModel = new MyModel()
                    // res below is a list of MyChild objects from a service call
                    def childList = jacksonObjectMapper.readValue(res, new TypeReference<List<MyChild>>() {})
                    myModel.setMyChildList(childList)

                    render(view: 'index', model: [myModelInstance: myModel grails.converters.JSON])
            }

在JavaScript中

  // Get model rendered from groovy action.
  var myModelInstance = ${myModelInstance};
  //Now iterate over the json object to get values
  for(var i = 0 ; i < myModelInstance.length; i++){
     console.log(myModelInstance[i]);
    /*If the list contain nested object (groovy map inside the list)
    then get key and values as,*/
    console.log("key:",myModelInstance[i].keyName);
    console.log("value:",myModelInstance[i].valueName);
  }

</script>