Javascript: Error in String Concatenation

Question

So I have this javascript function:

function show_courseline (course_index, repeats) {
var s = ""; 
var count = 0;
while (count < repeats) {
    s = s + 'Number: ' + document.getElementById(course_index + count + 'a').innerHTML + '\n' +
          'Semester: ' + document.getElementById(course_index + count + 'b').innerHTML + '\n' +
          'Year: ' + document.getElementById(course_index + count + 'c').innerHTML + '\n' +
          'Title: ' + document.getElementById(course_index + count + 'd').innerHTML + '\n' +
          'Units: ' + document.getElementById(course_index + count + 'e').innerHTML + '\n' +
          'Description: ' + document.getElementById(course_index + count + 'f').innerHTML + '\n';
    ++count;
}
alert(s);
}

But I get an error when I run it through an "onclick" input box. It has nothing to do with the document ids not being there, because they are.

Oops, nevermind, the second example erred on something else. — Leon Helmsley
– Leon Helmsley, Commented May 8, 2013 at 20:39

zitta · Accepted Answer · 2013-05-08 20:36:47Z

1

Is course_index integer? If it is course_index + count is an integer and I know that ids cannot start with a digit

answered May 8, 2013 at 20:36

zitta

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3 Comments

Leon Helmsley Over a year ago

Wow, that actually worked! Thanks! So why can't ID's start with digits?

zitta Over a year ago

It is related to the languages' grammar and compiler issues. Most of the programming languages are designed in such a way.

Blender Over a year ago

@zitta: This isn't completely correct. In HTML5, the only restrictions on id are uniqueness and consisting of one or more characters that aren't spaces.

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