Change Text Box Value Based on Select Input with Selected Attribute

Question

I am attempting to change the value of a text input based on the user selecting a value from a pulldown. I have got it working using the following,

Answer 1

To remember the form values you can use cookie functions:

$(document).ready(function() {
    var value = readCookie('fname');
    if (value) {
        $("#firstname").val(value);
        $('#name option[value="'+value+'"]').prop('selected', true);
    }
    $("#name").on("change", function() {
        var value = $(this).find("option:selected").attr("value");
        $("#firstname").val(value);
        createCookie('fname',value,31);
    });
});

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

jsfiddle - if you revisit this page, the name will be set back as on the page leave.

Answer 2

$('#name').val($('#firstname').val());

Answer 3

Give this one a try: http://jsfiddle.net/ufomammut66/mw4dY/

Basically onload I'm just selecting an option by the value, setting it to selected and then calling the change event. Your change event takes care of the rest.

$(document).ready(function() {                                       
  $("#name").live("change", function() {
    $("#firstname").val($(this).find("option:selected").attr("value"));
  });
  $('#name option[value=Frank]').attr('selected','selected').change();
});

Answer 4

Paste this code on $(document).ready

$("#name").val($("#firstname").val());

Answer 5

Try this,

$(document).ready(function() {

    $("#name option").filter(function() {
        return $(this).val() == $("#firstname").val();
    }).attr('selected', true);

    $("#name").live("change", function() {

        $("#firstname").val($(this).find("option:selected").attr("value"));
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js"></script>
<select id="name" name="name"> 
<option value="">Please select...</option> 
<option value="Elvis">Elvis</option> 
<option value="Frank">Frank</option> 
<option value="Jim">Jim</option> 
</select>

<input type="text" id="firstname" name="firstname" value="Elvis" readonly="readonly">

Answer 6

$(document).ready(function() {   

  $(document).on("change", "#name", function() {

     $("#firstname").val( this.value ); // this.value is enough for you

  }).val( $('#firstname').val() ).change(); // for pre-selection trigger

});      

Note

Instead of .live() use .on() with jQuery 1.7+, because live() is deprecated.

Syntax of .on() for delegate event handling is:

$(StaticParent).on( eventName, target, handlerFunction );

Where, StaticParent means the non-dynamic parent container of target element on which you want to bind event.

So, for above case it would be better to use any static parent of #name instead of document.