Auto-scaling input[type=text] to width of value?

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You can do this the easy way by setting the size attribute to the length of the input contents:

function resizeInput() {
    $(this).attr('size', $(this).val().length);
}

$('input[type="text"]')
    // event handler
    .keyup(resizeInput)
    // resize on page load
    .each(resizeInput);

See: http://jsfiddle.net/nrabinowitz/NvynC/

This seems to add some padding on the right that I suspect is browser dependent. If you wanted it to be really tight to the input, you could use a technique like the one I describe in this related answer, using jQuery to calculate the pixel size of your text.

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