Survey-library: How can set some formula/calculation ?

[lalitkhanna]

Are you requesting a feature, reporting a bug or ask a question?

What is the current behavior?

What is the expected behavior?

How would you reproduce the current behavior (if this is a bug)?

Provide the test code and the tested page URL (if applicable)

Tested page URL:

Test code

your_code_here

Specify your

• browser:
• browser version:
• surveyjs platform (angular or react or jquery or knockout or vue):
• surveyjs version:

[andrewtelnov]

@lalitkhanna Could you please describe your task? It is unclear now, what you are trying to achieve.

Thank you,
Andrew

[lalitkhanna]

@andrewtelnov , Lets say you've ans based on that you want to do some calculation .i.e.
Question1 : Did you go London ?
Ans : Yes or No ( If yes then your score 5 if No then 0)
Next Question2 : Do you know English ?
Ans : Yes or No (If Yes then score 5 if No then 0)

Based on inputs, we will calculate the score after finish the survey.i.e. Your total score is ...
Hope this will help you.

Thanks
Lalit

[tsv2013]

You can process survey results on onComplete event:

survey.onComplete.add(function(survey) {
        // survey.data contains survey results
        // here you can place your code to make necessary calculations, e.g. score
});

[lalitkhanna]

Thanks, What about if I want to calculate on run time means whenever user is choosing option, he/she is getting his/her result.

Thanks
Lalit

[tsv2013]

You can use onValueChanged event. The event is fired when the question value is changed. It can be done via UI by a user or programmatically on calling setValue method.
So you can update score on each answer.

[brydko]

@lalitkhanna if I'm not wrong you may use onValueChanged event just like so:

survey.onValueChanged.add(function (sender, options) {

var questionName = options.name;
var newValue = options.value;

//console.log("ON VALUE CHANGED CALLED - QUESTION_NAME - " + questionName);
//console.log("ON VALUE CHANGED CALLED - NEW_VALUE - " + newValue);

});

[tsv2013]

Good shot, @Kuhax !

[lalitkhanna]

Great!! Coming on Survey Editor.. Can we create a control in Editor which can be simply use for this purpose ?

Thanks
Lalit

[lalitkhanna]

Or Create a property in existing control, which can calculate this ?

Thanks
Lalit

[andrewtelnov]

@lalitkhanna What do you mean by creating a control? You may add a new property and it will be in the editor and you will be able to use it in run-time:

//add a property to the base question class and as result to all questions 
Survey.JsonObject.metaData.addProperty("questionbase", {name: "score:number", default: 0});

Here is the full docs about adding a property: http://editor.surveyjs.io/examples/addproperties.html#code

Thank you,
Andrew

[tsv2013]

I beleive we can show score in any place of the survey. But this will require some coding. We'll help you to implement it.

[lalitkhanna]

Thanks @andrewtelnov , @tsv2013,@Kuhax
This is great help for me.

I got an idea to implement my solution & will come back if I'll have any challenges.

Thanks
Lalit

[tsv2013]

Good luck, Lalit! Please feel free to contact us in case of any further questions!

[lalitkhanna]

Thanks!!

[lalitkhanna]

I didn't find Survey.JsonObject (object) in JS file,Can you please let me how we need to create this object &
which section I need to initialize ?

Thanks
Lalit

[tsv2013]

You should add to your html page link to the Survey.JS library. This is described in the library documentation.

For instance if you are using jQuery platform, you should add the following line:
<script src="https://surveyjs.azureedge.net/0.12.17/survey.jquery.min.js"></script>

[tsv2013]

You can open any example on the surveyjs.org site, lets say Product Feedback survey page and click "Edit in Plunker" button. You will be redirected to the Plunker playground where you can play with our code.

[lalitkhanna]

Trying hard to reach Plunker, not sure right now some issue is running on site.

Thanks
Lalit

[dmitrykurmanov]

@lalitkhanna plnkr.co is ok now, could ypu check it please?

[andrewtelnov]

No reply for several months. I am closing the issue.

[avium]

Regarding this quote:

@lalitkhanna What do you mean by creating a control? You may add a new property and it will be in the editor and you will be able to use it in run-time:

//add a property to the base question class and as result to all questions
Survey.JsonObject.metaData.addProperty("questionbase", {name: "score:number", default: 0});
Here is the full docs about adding a property: http://editor.surveyjs.io/examples/addproperties.html#code

Thank you,
Andrew

… it would appear the linked-to example is broken. When I try to change item values using the embedded surveyjs editor on that page, a JavaScript error is logged to the console:

Uncaught TypeError: __WEBPACK_IMPORTED_MODULE_1_survey_knockout__.Base.isValueEmpty is not a function
    at SurveyNumberPropertyEditor.SurveyPropertyEditorBase.onkoValueChanged (propertyEditorBase.ts:178)
    at a.vc.gb (propertyEditorBase.ts:39)
    at Function.notifySubscribers (knockout.js:37)
    at Function.fa (knockout.js:40)
    at c (knockout.js:40)
    at Object.Ea (knockout.js:61)
    at HTMLInputElement.l (knockout.js:101)
    at HTMLInputElement.dispatch (jquery?v=FVs3ACwOLIVInrAl5sdzR2jrCDmVOWFbZMY6g6Q0ulE1:1)
    at HTMLInputElement.y.handle (jquery?v=FVs3ACwOLIVInrAl5sdzR2jrCDmVOWFbZMY6g6Q0ulE1:1)

I'm assuming this is merely an issue with that particular example page, and I'm not sure if this warrants a separate ticket or not.

[andrewtelnov]

@avium Yes, there was a bug in v0.12.29.. We have fixed it. The current version is 0.12.30

Thank you,
Andrew