asked on

javascript

Hi guys,

I'm really beginner to javascript and I would like to know how do I write some result to the textarea.

Here is what I'm trying to do:

        function lopwhil() {
            var target = Number(prompt("Please enter number max (100)"))
            var txtare = document.getElementById("numd").value;
            var wrto = start + "<br/>";
            var start = 0;
            while (start <= target) {
                document.write(start + "<br/>");
                start = start + 2;
                
                if (start > 100)
                    break;
            }
        }

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so instead to write to "document.write(start + " "); i would like to write the result to the variable I prepared which is my textarea - "var txtare = document.getElementById("numd").value;"

thanks ,

Jeffrey Dake

I would really recomend using jquery. There are a lot of functions already written to do what you are trying to do. It is also a very commonly used library and well supported. Here is an example of using the val() function to get and set values.

http://www.jquerytutorials.net/jquery-textarea.html

Paul Jackson

change variable textare so it refers to the textarea rather than the textarea value:

var txtare = document.getElementById("numd").value;

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to :

var txtare = document.getElementById("numd");

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then change the document write :

...
            while (start <= target) {
                textare.value = start + "<br/>";
...

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so you end up with:

function lopwhil() {
            var target = Number(prompt("Please enter number max (100)"))
            var txtare = document.getElementById("numd");
            var wrto = start + "<br/>";
            var start = 0;
            while (start <= target) {
                textare.value = start + "<br/>";
                start = start + 2;
                
                if (start > 100)
                    break;
            }

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Moti Mashiah

ASKER

I have changed the code as your suggestion and I got just one value in the textarea. for example in the prompt window I typed 50 and entered so in this case i should get back the number 2,4,6,8 until 50 so i got just 50 to the textarea,

Now i was trying to loop it and get the same result.

function lopech() {
            var target = Number(prompt("Please enter number max (100)"))
            var txtare = document.getElementById("numd");

            for(var start = 0; start <= target; start = start + 2 ){
                txtare.value = (start + "<br/>");

                if (start > 100)
                    break;
            }

        }

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please help thanks ,

Rainer Jeschor

Hi,
this is due to the fact that you always overwrite the textarea.
This should fix it:

function lopech() {
            var target = Number(prompt("Please enter number max (100)"))
            var txtare = document.getElementById("numd");

            for(var start = 0; start <= target; start = start + 2 ){
                txtare.value = (""+ txtare.value + start + "<br/>");

                if (start > 100)
                    break;
            }

        }

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HTH
Rainer

SOLUTION

Paul Jackson

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SOLUTION

Rainer Jeschor

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Moti Mashiah

ASKER

Hi guys ,

thank you for you solution it is working now, just the result show also the break

like:
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 

Here is the code:

 function lopech() {
            var target = Number(prompt("Please enter number max (100)"));
            var txtare = document.getElementById("numd");

            for (var start = 0; start <= target; start = start + 2) {
                txtare.value = ("" + txtare.value + start + "<br/>");

                if (start > 100)
                    break;
            }

        }

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ASKER CERTIFIED SOLUTION

Moti Mashiah

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Moti Mashiah

ASKER

k, I found the solution regarding the line

txtare.value = (""+ txtare.value + start + "\n");

thank you.

Moti Mashiah

ASKER

solved