Fix a character to text input box using javascript/jquery

I am looking for a way to ‘fix’ a dollar symbol $ to a text input box eg <input type="text" value="$" /> but make it not possible for the default value to be removed, so that whatever the user inputs, there is always a $ symbol ‘prepending’ input.

Cheers

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  • 5 Solutions collect form web for “Fix a character to text input box using javascript/jquery”

    There is the possibility of a background-image but it’s difficult to maintain, and doesn’t react to font size changes, which makes it the less optimal choice IMO.

    A better way in my opionion would be:

    • Put a <span>$</span> next to the input (before it, actually).

    • give it position: relative; left: 20px.

    • The $ sign then moves into the input field.

    • Then, give the input field padding-left: 24px.

    • Voilá! The $ sign is in the input field, does not obscure anything, and cannot be removed.

    Expanding on Pekka’s answer, I used this on my page, but I automated it a little bit with jQuery. So for this example, all of the input fields that I want to put a $ symbol in, I give them a class of “cost”.

    CSS:

    <style type=&quot;text/css&quot; media="screen">
    .cost{
        position: relative;
        left: 20px;
    }
    input.cost{
        padding-left: 24px;
    }
    </style>
    

    jQuery:

    <script type="text/javascript">
    $(document).ready(function(){    
        $("#lcce form input.cost").wrap('<div class=&quot;cost">');
        $("#lcce form input.cost").before('<span class="cost"></span>');
    });
    </script/>
    

    This will place the span with a class of “cost” right before your input, and also wrap a div around both the input, and the span, so they are ensured to be on the same line.

    If you don’t have jQuery, you can get it from: jQuery.com

    Now I’ve got a quick question – I noticed that with this styling, in IE6,7, and 8, the $ symbol is not lined up correctly. Does anybody out there have a fix for this?

    Thank you!

    Is this as a visual effect only? If yes you could apply that with CSS as a background image on the input.

    Afterwards, on the server, you can do whatever you want with the value (e.g prepend it with $).

    I too have been looking at different solutions for this. Using css to indent the text with padding and putting a background image in that position is your best bet.

    I did it like this:

    $('#price').keypress(function(event) {
    var code = (event.keyCode ? event.keyCode : event.which);
    if ($(this).val().indexOf('$') === -1){
        document.getElementById("price").value = "$" + $(this).val();
      } else {
        document.getElementById("price").value = $(this).val();
      }  
    });
    

    with <input type="text" id="price">.

    User can remove the dollar sign manually though if he/she wants to.