NodeJS: Pass array and display the values on html page

Question

I have written below code to read values from mongodb using mongoose and store it in array:

app.get('/StudentQuestionsPage',function(req,res){
    var allQuestionsArray = studentQuestions.find();
    var questions = [];
    allQuestionsArray.exec(function(err,questions){
        if(err)
            return cosole.log(err);
        questions.forEach(function(question){       
            var elem = new Object();
            elem["id"] = question.id;
            elem["quesStatement"] = question.quesStatement;
            elem["optionA"]=question.optionA;
            elem["optionB"]=question.optionB;
            elem["optionC"]=question.optionC;
            elem["optionD"]=question.optionD;

            questions.push(elem);
            console.log(elem)
        });
    }); 
    res.render(__dirname + '/StudentQuestionsPage.html',{questions:questions});
});

I have to pass this array of questions to an html file and then I have to show the content on HTML.

I have written below code to show array values on HTML but it does not show anything. "console.log(elem)" can print values on console.

<html>
    <head>
        <title>Online Examination Portal</title>
        <h1>Questions</h1>
    </head> 
    <body>
        <div>   
        <form>
            <h2>Questions</h2>
                <ul>
                    <% questions.forEach(function(question) { %>
                    <li>Number: <%= question.id %> <br/> Text: <%= question.quesStatement %></li>
                    <% }); %>
                </ul>
        </form>
        </div>
    </body>
</html>

Please let me know how can I pass the values from nodejs and retrieve and show it on html.

Mikko · Accepted Answer · 2018-01-08 07:19:29Z

3

Firstly, rename your questions array to allQuestions or whatever you want exept questions. Your .exec's success function's parameter name is same as the array. So, it will override the array variable. Since allQuestionsArray.exec is an async function you should pass the allQuestions array from success function. Rewrite your code as following...

app.get('/StudentQuestionsPage',function(req,res){
var allQuestionsArray = studentQuestions.find();
var allQuestions = [];
allQuestionsArray.exec(function(err,questions){
    if(err)
        return console.log(err);
    questions.forEach(function(question){       
        var elem = new Object();
        elem["id"] = question.id;
        elem["quesStatement"] = question.quesStatement;
        elem["optionA"]=question.optionA;
        elem["optionB"]=question.optionB;
        elem["optionC"]=question.optionC;
        elem["optionD"]=question.optionD;

        allQuestions.push(elem);
        console.log(elem)
    });
    res.render(__dirname + '/StudentQuestionsPage.html',{questions:allQuestions});
  }); 
});

edited Jan 8, 2018 at 7:19

Mikko

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answered Jan 5, 2016 at 12:01

PaulShovan

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4 Comments

PaulShovan Over a year ago

@Abhinav have you tried the solution? Is there any issue ?

Abhinav Over a year ago

Yes, I tried. But it does not display anything on HTML.

PaulShovan Over a year ago

@Abhinav I think you have some problems with the HTML. Please, review it.

PaulShovan Over a year ago

is you html page loading correctly? is data loading correctly? please check

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