How to make multiple inline-block elems to stretch full width of the container?

Question

What is the best way to implement input field and button behavior as displayed here:

Answer 1

I like the answer of ScottS, but just to have an alternative: you could use table-like behaviour in CSS:

CSS

.formline{
    display: table;
}
.txt{
    display: table-cell;
    width: 100%;
}
input[type=text]{
    -moz-box-sizing: border-box; box-sizing: border-box;
    width: 100%;
}​

HTML

<div class=formline>
    <div class=txt>
        <input type=text>
    </div>
    <input type=submit value=submit>
</div>

http://jsfiddle.net/willemvb/VaFSP/

Answer 2

Yes, with some html and css in place that uses some magic between float and overflow: hidden, you can see it working in this fiddle.

HTML

<div class="container">
    <div>Some Text</div>
    <form>
        <button>MyButton</button>
        <div class="stretcher"><input type="text" /></div>
    </form>
</div> 

CSS

.stretcher {
    overflow: hidden;
}

button {
    float: right;
}

input {
    width: 100%;
}