Question

I have two HTML input fields article and url.

How to duplicate field ‘article’ entry to field ‘url’ to SEO friendly link!?

• url allowed symbols a-z (capital letters converted to lowercase),
• url space symbol replace with dash -,
• url other symbols ignored.

required typing just in field article

<input type="text" name="article">

url field is jquery auto generated and updated by field article value

<input type="text" name="url">

Answer 1

This should work:

function name_to_url(name) {
    name = name.toLowerCase(); // lowercase
    name = name.replace(/^\s+|\s+$/g, ''); // remove leading and trailing whitespaces
    name = name.replace(/\s+/g, '-'); // convert (continuous) whitespaces to one -
    name = name.replace(/[^a-z-]/g, ''); // remove everything that is not [a-z] or -
    return name;
}

and then

$('input[name=article]').blur(function() {
    $('input[name=url]').val(name_to_url($(this).val())); // set value
});

This sets the value in the url field every time the article field looses focus.

---

It keeps already existing - in the name. So if you want to remove them too, you have to change the second last and third last line of name_to_url() to:

name = name.replace(/[^a-z ]/g, ''); // remove everything that is not [a-z] or whitespace
name = name.replace(/\s+/g, '-'); // convert (continuous) whitespaces to one -

---

Reference: .blur(), .val(), .toLowerCase(), .replace()

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Update:

I would create a new function, lets say, update_URL():

function update_URL() {
     var value = name_to_url($('input[name=article]').val()) + '-' + $('input[name=year]').val();
     $('input[name=url]').val(value)
}

then you can call this function on whatever event, e.g. on keyup():

$('input[name=article]').keyup(function() {
    update_URL();
});