Question

The problem is that nothing happens when pressing the button. Problem is now solved. The thing is Javascript is case sensitive, and that made it. Stupid fail from my side.

        <script>
        function calculate() {
        var elev = document.getElementsByName("txt");

would do it? But it doesn’t? What’s wrong?

                    ...
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                </td>
                <td>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>
                    <input type="text" name="txt" value="Insert name"><br/>

                    ...
    <input type="button" value="Calculate" onclick="Calculate(event)" />
        <script>
        function calculate() {
        var elev = document.getElementsByName("txt");
        for(i=0; i<elev.length; i++) {
            elev[i].used = false;
        }

        for(j=0; j<elev.length; j++) {
            var name1;
            var name2;
            var r = Math.floor(Math.random() * 20);
            var k = Math.floor(Math.random() * 20);

            if (elev[r].used) {
                for(a=0; elev[a].used=true; a++) {
                    elev[a] = elev[r];
                }
                }
            if (elev[k].used) {
                for(b=11; elev[b].used=true; b++) {
                    elev[b] = elev[r];
                    if (b===11) {
                        b=0;
                    }
                }
            }


            name1 = elev[r];
            name1.used = true;
            name2 = elev[k];
            name2.used = true;
            document.write(name1 + " og " + name2 );
        }
    }

         </script>
      </body>
    </html>

Answer 1

‘JavaScript’ is case sensitive. You assign a Calculate handler function to the onclick event.

<input type="button" value="Calculate" onclick="Calculate(event)" />

But the actual function name is calculate (which is a different function for JS).

function calculate() {

Just fix this problem and the code should work.