[解決済み] DIVの全テキストをシングルマウスで選択する

function selectText(containerid) {
    if (document.selection) { // IE
        var range = document.body.createTextRange();
        range.moveToElementText(document.getElementById(containerid));
        range.select();
    } else if (window.getSelection) {
        var range = document.createRange();
        range.selectNode(document.getElementById(containerid));
        window.getSelection().removeAllRanges();
        window.getSelection().addRange(range);
    }
}

<div id="selectable" onclick="selectText('selectable')">http://example.com/page.htm</div>