Question

I’ve adapted a PHP script lifted from another project to use in JavaScript, this script works great for shortening text to a set limit. I would like to use it to also split it to multiple parts if it is over the set limit.

The current code which shortens once is here: http://jsfiddle.net/WilliamIsted/P5jxK/

Here’s what I have so far: http://jsfiddle.net/WilliamIsted/UkhXL/ (I’m pretty sure I’m not doing it right)

I have gotten stuck in loops a few to many times, I’m not sure how to proceed with it.

function strTruncate($string, $your_desired_width) {

    arr = [];

    if (typeof($last_part)) {
        $last_part = 0;
    }

    $parts = $string.split(/([\s\n\r]+)/);
    $parts_count = $parts.length;

    $length = 0;
    $last_part = 0;
    for (; $last_part < $parts_count; ++$last_part) {
        $length += $parts[$last_part].length;
        if ($length > $your_desired_width) {
            break;
        }
    }

    $start_part = 0;

    return $parts.slice($start_part, $last_part).join('');

}

Shorten Once Result:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer malesuada, est ut interdum ullamcorper, metus lorem interdum ipsum, vitae

New Expected Result:

array[0] = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer malesuada, est ut interdum ullamcorper, metus lorem interdum ipsum, vitae",
array[1] = "vulputate ante quam ut augue. Praesent sit amet varius lorem. Aliquam odio nunc, mattis in mollis vitae, laoreet non velit. Curabitur"
array[2] = "adipiscing, nisl tincidunt consequat ornare, ligula mauris sed."

Answer 1

I believe what you’re looking for is a script like this:

function strSplitOnLength(data, your_desired_width) {
    if(data.length <= 0)
        return [];  // return an empty array

    var splitData = data.split(/([\s\n\r]+)/);
    var arr = [];
    var cnt = 0;
    for (var i = 0; i < splitData.length; ++i) {
        if (!arr[cnt]) arr[cnt] = '';  //Instantiate array entry to empty string if null or undefined

        if (your_desired_width < (splitData[i].length + arr[cnt].length))
            cnt++;

        arr[cnt] += splitData[i];
    }

    return arr;
}

strSplitOnLength('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer malesuada, est ut interdum ullamcorper, metus lorem interdum ipsum, vitae vulputate ante quam ut augue. Praesent sit amet varius lorem. Aliquam odio nunc, mattis in mollis vitae, laoreet non velit. Curabitur adipiscing, nisl tincidunt consequat ornare, ligula mauris sed.', 140);​