How to populate list of checkbox values with AngularJS?

Question

I am trying to build a quiz application in angular js with serverside for that i have 2 type of choices:

Multiple options for one question (input-checkbox). "dataType": 3,
Single option for one question. (input-radio) "dataType": 2,

I am trying to populate stored answer for multiple checkbox questions in this case storedAnswer is an array, whereas storedAnswer is an integer value for input radio

Note: storedAnswer array contains the option.questionChoiceValue's

My question is how can i populate array value as checked for multiple choice (checkbox) question:

This is my HTML code:

<div ng-repeat="question in data.questionData">

    <span name="multiSelectCheckBox" ng-if="question.dataType == 3">
        <div ng-repeat="option in question.choices " class="">
            <label for="mul_{{option.questionChoiceValue}}_ques{{option.questionId}}">
                <span ng-repeat="stAns in question.storedAnswer"
                      ng-if="stAns == option.questionChoiceValue">
                    <input id="mul_{{option.questionChoiceValue}}_ques{{option.questionId}}" 
                        type="checkbox"
                        ng-model="question.storedAnswer"
                        ng-change="onSelect(question, option);" /> 
                      {{option.questionChoiceText}}
                </span>
            </label>
        </div>
    </span>

    <span name="multiSelectRadio" ng-if="question.dataType == 2">
        <div ng-repeat="option in question.choices  " class="">
            <label for="sin_{{option.questionChoiceValue}}_ques{{option.questionId}}">

                <input type="radio" id="sin_{{option.questionChoiceValue}}_ques{{option.questionId}}" 
                    ng-model="question.storedAnswer" 
                    value="{{option.questionChoiceValue | number}}"
                    name="que_ques{{option.questionId}}"
                    ng-change="onSelect(question, option);" />
                  {{option.questionChoiceText}}                 
            </label>
        </div>
    </span>
</div>

I have an object like this:

[
    {
        "marked": "false",
        "questionId": "7d00a35ddb6313004f3bdde748961969",
        "helpText": "",
        "answered": "true",
        "storedAnswer": [
            1,
            5
        ],
        "questionSno": 1,
        "dataType": 3,
        "choices": [
            {
                "questionId": "7d00a35ddb6313004f3bdde748961969",
                "questionChoiceValue": 5,
                "questionChoiceText": "Float, long double"
            },
            {
                "questionId": "7d00a35ddb6313004f3bdde748961969",
                "questionChoiceValue": 4,
                "questionChoiceText": "Float"
            },
            {
                "questionId": "7d00a35ddb6313004f3bdde748961969",
                "questionChoiceValue": 3,
                "questionChoiceText": "float, double, long double"
            },
            {
                "questionId": "7d00a35ddb6313004f3bdde748961969",
                "questionChoiceValue": 2,
                "questionChoiceText": "long double, short int"
            },
            {
                "questionId": "7d00a35ddb6313004f3bdde748961969",
                "questionChoiceValue": 1,
                "questionChoiceText": "short int, double, long int, float"
            }
        ],
        "questionText": "In C, what are the various types of real data type (floating point data type)?",
        "selected": "false"
    },
    {
        "marked": "false",
        "questionId": "93e5c5e5db6713004f3bdde748961957",
        "helpText": "",
        "answered": "false",
        "storedAnswer": 1,
        "questionSno": 3,
        "dataType": 2,
        "choices": [
            {
                "questionId": "93e5c5e5db6713004f3bdde748961957",
                "questionChoiceValue": 3,
                "questionChoiceText": "May be"
            },
            {
                "questionId": "93e5c5e5db6713004f3bdde748961957",
                "questionChoiceValue": 2,
                "questionChoiceText": "False"
            },
            {
                "questionId": "93e5c5e5db6713004f3bdde748961957",
                "questionChoiceValue": 1,
                "questionChoiceText": "True"
            }
        ],
        "questionText": "A macro can execute faster than a function.",
        "selected": "false"
    }
]

georgeawg · Accepted Answer · 2018-07-28 20:00:51Z

1

I believe you should be using ng-checked instead of ng-model for your radio. Like this:

<input type="radio" id="sin_{{option.questionChoiceValue}}_ques{{option.questionId}}"
       ng-checked="question.storedAnswer"
       value="{{option.questionChoiceValue | number}}"
       name="que_ques{{option.questionId}}"
       ng-change="onSelect(question, option);" />

edited Jul 28, 2018 at 20:00

georgeawg

49k13 gold badges78 silver badges98 bronze badges

answered Jul 28, 2018 at 17:19

rlwheeler

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3 Comments

Mr world wide Over a year ago

radio is working fine i have a problem with checkboxes because storedAnswer is an array

rlwheeler Over a year ago

So you're asking how to mark the radios as selected on initialization based on the storedAnswers array?

georgeawg Over a year ago

In order to work, the ng-change directive needs the ng-model directive and the ng-checked directive doesn' t play nice with the ng-model directive.

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