writing to a coordinate in a textarea

132 100+

Hello everyone,

I've been browsing the net for some time now and I can't find the answer I'm looking for.

I'm trying to insert text in a textarea but at a specified place. 30 characters from the left side of the textarea. But I can't find that script.

What I did found were scripts to insert text at the cursor. The caret position was saved in a variable and then new text inserted at that caret-position. However, I would like to specify the location in the script. Anybody knows how to achieve this?

Thanks,

Cainnech

Jan 8 '08 #1

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mrhoo

428

256MB

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var str=' String to insert';

var n=30;

var val= textareareference.value;

textareareference.value= val.substring(0,n)+ str+ val.substring(n);

Jan 8 '08 #2

Cainnech

132

100+

Hi MrHoo,

I've tried the code but it doesn't seem to work. On the net I found not really that much information about it. Could you explain me how the textareareference works ?

Thanks,

Cainnech

Jan 8 '08 #3

mrhoo

428

256MB

Excuse me- when I said textareareference, I meant
'put a reference to the textarea here'-
for example, if you had one textarea on the page you could use
document.getElementsByTagName('textarea')[0],
or if it had an id of 'mytext' it could be
document.getElementById('mytext').

Jan 8 '08 #4

Cainnech

132

100+

Hi Mrhoo,

Silly me, I didn't think of it that way :-)

I tested it, and it writes the code into the textarea except it writes it in theleft corner and not at the 30th character. Am I doing something wrong?

Expand|Select|Wrap|Line Numbers

 
<HTML>

<HEAD>

<SCRIPT>
 
function execute(){

var str='This is a test';

var n=30;

var val = document.form.output.value;

document.form.output.value += val.substring(0,n)+ str + val.substring(n);

}

</SCRIPT>
 
</HEAD>

<BODY>

<form name="form">

<textarea name="output" cols="50" rows="15"></textarea>

<br>

<input type="button" value="Test it" onclick="execute()">

<input type="reset" value="reset">

</form>

</BODY>

</HTML>

Jan 8 '08 #5

mrhoo

428

256MB

If you do not have 30 characters you need to insert them-
and don't use += to set the value here.

<HTML>
<HEAD>
<SCRIPT>

Expand|Select|Wrap|Line Numbers

 function execute(){

    var str= 'This is a test';

    var n= 30;

    var who= document.getElementsByName('output')[0];

    var val= who.value;

    while(val.length<n)val= ' '+ val;

    who.value= val.substring(0,n)+' '+ str + ' '+

    val.substring(n);

}

</SCRIPT>

</HEAD>
<BODY>
<form>
<textarea name="output" cols="50" rows="15"></textarea>
<br>
<input type="button" value="Test it" onclick="execute()">
<input type="reset" value="reset">
</form>
</BODY>
</HTML>

Jan 8 '08 #6

Cainnech

132

100+

Thanks mrhoo,

That works indeed. Except I just came to realise that this probably isn't the right approach for my purpose because I need to put it on every line.

You see I'm generating an output in the textarea and a part of that output I want to align to character 30 just so the contents are clear and structured.

I'll have to experiment further to make it work I think.

But thanks for the help you've given me.

Cainnech

Jan 8 '08 #7

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