cmd/present/static/dir.js

// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// copied from $GOROOT/doc/godocs.js

function bindEvent(el, e, fn) {
  if (el.addEventListener){
    el.addEventListener(e, fn, false);
  } else if (el.attachEvent){
    el.attachEvent('on'+e, fn);
  }
}

function godocs_bindSearchEvents() {
  var search = document.getElementById('search');
  if (!search) {
    // no search box (index disabled)
    return;
  }
  function clearInactive() {
    if (search.className == "inactive") {
      search.value = "";
      search.className = "";
    }
  }
  function restoreInactive() {
    if (search.value !== "") {
      return;
    }
    if (search.type != "search") {
      search.value = search.getAttribute("placeholder");
    }
    search.className = "inactive";
  }
  restoreInactive();
  bindEvent(search, 'focus', clearInactive);
  bindEvent(search, 'blur', restoreInactive);
}

bindEvent(window, 'load', godocs_bindSearchEvents);