Making a Resizable div in JS is Very Simple

Create this form. Pulling the corner of which, you can stretch and compress the field horizontally and vertically.


HTML


<form>
<textarea rows="2" cols="50" OnKeyUp="ResizeTextArea(this,2);"></textarea>
</form>

We set the minimum dimensions and embellish.

textarea {
   width: 30em;
   height: 5em;
   border-radius: 3px;
   box-shadow: 0 1px 5px rgba(0, 0, 0, 0.7); 				
}

Javascript

function countLines(strtocount, cols) {
var hard_lines = 1;
var last = 0;
while ( true ) {
last = strtocount.indexOf("\n", last+1);
hard_lines ++;
if ( last == -1 ) break;
}
var soft_lines = Math.ceil(strtocount.length / (cols-1));
var hard = eval("hard_lines " + unescape("%3e") + "soft_lines;");
if ( hard ) soft_lines = hard_lines;
return soft_lines;
}

function ResizeTextArea(the_form,min_rows) {
the_form.rows = Math.max(min_rows,countLines(the_form.value,the_form.cols) +1);
}

That's all. Such a small but very useful script.

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