LayoutTests/fast/forms/input-maxlength.html

<p>This page tests that the <tt>maxlength</tt> attribute of the <tt>&lt;input&gt;</tt> element works correctly. <a href="http://bugs.webkit.org/show_bug.cgi?id=14388">http://bugs.webkit.org/show_bug.cgi?id=14388</a></p>
<input id="input">
<pre id="log"></pre>
<script>
    function log(msg)
    {
        document.getElementById("log").appendChild(document.createTextNode(msg + "\n"));
    }

    if (window.layoutTestController)
        layoutTestController.dumpAsText();

    var testString = "";
    var input = document.getElementById("input");

    function attempt(length, expected)
    {
        log("Attempting to insert " + length + " characters with maxLength = " + input.getAttribute("maxlength") + ".");

        if (testString.length > length)
            testString = "";

        for (var i = testString.length; i < length; ++i)
            testString += i % 10;

        input.value = testString;

        if (input.value.length == expected)
            log("PASS");
        else
            log("FAIL: Expected " + expected + " characters to be inserted, but " + input.value.length + " characters were actually inserted.");
    }

    var implicitMaxLength = 524288;

    var stringLengthsToTest = [0, 5, 100, 101, 200, 524287, 524288, 524289, 530000];
    var maxLengthsToTest = ["-1", "100", "524288", "600000"];

    for (var i = 0; i < stringLengthsToTest.length; ++i) {
        var stringLength = stringLengthsToTest[i];
        for (var j = 0; j < maxLengthsToTest.length; ++j) {
            var maxLength = maxLengthsToTest[j];
            input.setAttribute("maxlength", maxLength);
            if (maxLength < 0 || maxLength > implicitMaxLength)
                maxLength = implicitMaxLength;
            var expected = Math.min(stringLength, maxLength);
            attempt(stringLength, expected);
        }
    }
</script>