Add Prefix in text field

When you have to prefix any hard coded value in a text field, like for example in telephone field you have to prefix the country code and dont want the user to remove it, then in that case assign the prefix code in the text field and add the below javascript code code

jQuery("input[name='job-code']").keydown(function(e) {
    var oldvalue = jQuery(this).val();
    var field = this;
    setTimeout(function() {
        if (field.value.indexOf('JPC-') !== 0) {
            jQuery(field).val(oldvalue);
        }
    }, 1);
});

Demo: https://codepen.io/phpweblamp/pen/yLwPqjJ

Vinod Ram

Vinod Ram has been in Software Industry since 2006 and has experience of over 16 years in Software Development & Project Management domain specialised majorly in LAMP stack & Open Source Technology, building enterprise level Web based Application, Large Database driven and huge traffic Websites and Project Management.

He loves to write information articles and blog to share his knowledge and experience with the outside world and help people to find solution for their problems.

www.linkedin.com/in/vinodkram