Javascript: Passing parameters to a function to call a variable

Question

Having trouble at work when trying to enhance a function. I just took an introductory couse in Javascript so I'm hoping I will find a lot of people to help me get better. :)

here is an example of what I want to do:

 <script type="text/javascript">

var title1 = "<h2>Cisco</h2>";
var summary1 = "<p>Cool class</p>";
var Register1 = "<button>Register</button>";

var title2 = "<h2>Whatever title</h2>";
var summary2 = "<p>Whatever Summary</p>";
var Register2 = "<button>Whatever Register</button>";

 //But I have to create about 10 functions if I do it this way...
     function course1()
     {
          document.getElementById('courseTitle').innerHTML = title1;
          document.getElementById('courseSummary').innerHTML = summary1;
          document.getElementById('courseRegister').innerHTML = Register1;

     }

     function course2()
     {
          document.getElementById('courseTitle').innerHTML = title2;
          document.getElementById('courseSummary').innerHTML = summary2;
          document.getElementById('courseRegister').innerHTML = Register2;

     }

//So I taught about doing it with parameters so I could only build one function. 
//For some reason it doesn't work.


//Here is how my improved function idea looks
     function course(x)
     {
          document.getElementById('courseTitle').innerHTML = title+x;
          document.getElementById('courseSummary').innerHTML = summary+x;
          document.getElementById('courseRegister').innerHTML = Register+x;

     }

//And here is how you would call them

<input type"button" value="course1" onclick="course(1)">
<input type"button" value="course1" onclick="course(2)">

I would appreciate any help! Thank You.

No, sorry, this is not an example of what you want to do. This is a sample of code without a question... — adamb
– adamb, Commented Dec 5, 2013 at 16:44
@adamb the question is inside the code AND OP, try explaining what you need in the content of the Question, not in comments in the code — Victor Ferreira
– Victor Ferreira, Commented Dec 5, 2013 at 16:53
I suggest to read a JavaScript tutorial to learn even more about the basics: eloquentjavascript.net. — Felix Kling
– Felix Kling, Commented Dec 5, 2013 at 17:10
That worked Victor Ferreira! Thanks all for the tips. I'll be more clear if a next question. This site is awesome. — user3071062
– user3071062, Commented Dec 5, 2013 at 18:15

Sirko · Accepted Answer · 2013-12-05 16:46:28Z

4

You could use an array to hold the data:

var data = [{
                title: "<h2>Cisco</h2>",
                summary: "<p>Cool class</p>",
                Register: = "<button>Register</button>"
            },{
                title: "<h2>Whatever title</h2>",
                summary: "<p>Whatever Summary</p>",
                Register: "<button>Whatever Register</button>"
            }];

and then just pass an index to your function:

function course( index ) {
  document.getElementById('courseTitle').innerHTML = data[index].title;
  document.getElementById('courseSummary').innerHTML = data[index].summary;
  document.getElementById('courseRegister').innerHTML = data[index].Register;
}

answered Dec 5, 2013 at 16:46

Sirko

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Comments

Victor Ferreira · Accepted Answer · 2013-12-05 16:47:59Z

you need to use an Array

var globalCourses = [['cisco','cool class','register'],['whatever','whatever sum','whatever reg']];


function course(i){
   var title = globalCourses[i][0];
   var summary = globalCourses[i][1];
   var register = globalCourses[i][2];

  //do what you need with this
  document.getElementById('courseTitle').innerHTML = title;
 //etc
}

so anytime you think of a set of data whose parameters are the same, use arrays or arrays of objects.

you could also do something like:

var globalCourses = [{title:"title",summary:"sum",register:"register"},{title:"another title",summary:"another sum",register:"another register"}];

function course(i){
 var title = globalCourses[i].title;
 var summary = globalCourses[i].summary;
 //etc
}

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