How to convert between JavaScript associated array and Java List Map

Question

I have code as below, I want to do all in Java code to create categoryListMap object, then convert to categoryList, how can I do?

    ...
    var categoryList = [];

<%
    List<Object> modelMaster = psiSearchForm.getModelMaster();
    String parentKey = "";
    String categoryKey = "";
    String text = "";

    for (int i = 0; i < modelMaster.size(); i++) {
        Map option = (Map) modelMaster.get(i);

        parentKey = (String)option.get(ConstantContainer.MODALITY);
        categoryKey = (String)option.get(ConstantContainer.CATEGORY);
        text = categoryKey + ": " + (String)option.get(ConstantContainer.CATEGORY_NAME);
%>
        categoryList.push({
            parent: "<%=parentKey%>",
            key: "<%=parentKey%><%=categoryKey%>",
            text: "<%=text%>"
        }); 
<%
    }
%>

JSP expressions are not chuck norris it cant call array.push of javascript from Java. Only chuck norris has that power. — karthick
– karthick, Commented Jun 14, 2017 at 5:21
I mean After created List Map in java, then use for loop in javascript to push to categoryList, may I make sense? — mikezang
– mikezang, Commented Jun 14, 2017 at 5:23
you can create a JSON object and assign that to categoryList — karthick
– karthick, Commented Jun 14, 2017 at 5:23
Yes your code is sufficient, I can understand what you are trying to do. But that is impossible. Java cant call javascript in a template. You can instead create a json object and assign that to categoryList — karthick
– karthick, Commented Jun 14, 2017 at 5:25

karthick · Accepted Answer · 2017-06-14 06:37:51Z

0

You are trying to call JavaScript function in JSP, this is not possible. You can instead create the array in JSP and set the final value in javascript.

<body>
<%

    JSONArray arr = new JSONArray();
    for(int i =0; i < 5; i++) {
        JSONObject object = new JSONObject();

        object.put("name", "santa"+i);
        object.put("mail", "santa"+i+"@email.com");

        arr.add(object);
    }

%>
    <script>
        var obj = <%= arr %>;

        console.log("JS obj", obj);
    </script>
</body>

The library I am using is json-simple-1.1.1.jar.

page import

<%@page import="org.json.simple.JSONObject,org.json.simple.JSONArray"%>

answered Jun 14, 2017 at 6:37

karthick

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