Question

This is the function that I have

function set(sub) {
    var input = prompt("Insert your desired " + sub + " information, leave blank if you use an automated system to generate this information.");
    $('#' + sub).html(input).show();
    var textarea = $('textarea');
    textarea.html(textarea.html().replace(sub+"=",sub+"="+input));
}

Usually the sub is s1, or s2, or s3. Now the issue is that I want the replaced value to reset if the input is blank.

So lets say I input that I want to set s1 to equal a, so in the text area it will replace s1= with, s1=a, now if the input is empty I want the s1=a to revert back to s1=

Answer 1

How about this? It uses a regular expression (Regex) to do the replacements.

function set(sub) {
    var input = prompt("Insert your desired " + sub + " information, leave blank if you use an automated system to generate this information.");
    $('#' + sub).html(input).show();

    var pattern = new RegExp('(' + sub + '=[^&]*)', 'ig');    
    var $textarea = $('textarea');

    // Do Replacements
    var content = $textarea.html().replace(pattern, sub + '=' + input);
    $textarea.html(content);
}​