JavaScript基于ajax编辑信息用法实例

// Requires prototype.jsfunction edit(action, obj) {  Element.hide(obj);  var textarea ='<div id="' + obj.id + '_editor"><input type="text" id="' + obj.id + '_edit" name="' + obj.id + '" value="' + obj.innerHTML + '" size="40">';  var button = '<input id="' + obj.id + '_save" type="button" value="SAVE" /> <input id="' + obj.id + '_cancel" type="button" value="CANCEL" /></div>';  new Insertion.After(obj, textarea+button);  Event.observe(obj.id+'_save', 'click', function(){saveChanges(action, obj)}, false);  Event.observe(obj.id+'_cancel', 'click', function(){cleanUp(obj)}, false);  $(obj.id+"_edit").focus();  $(obj.id+"_edit").select();}function cleanUp(obj, keepEditable) {  Element.remove(obj.id+'_editor');  Element.show(obj);  if(!keepEditable) showAsEditable(obj, true);}function saveChanges(action, obj) {  var new_content = escape($F(obj.id+'_edit'));  obj.innerHTML = "Saving...";  cleanUp(obj, true);  var success = function(t){editComplete(t, obj);}  var failure = function(t){editFailed(t, obj);}  var url = 'poll-ajax.php?a='+action;  var pars = 'id=' + obj.id + '&content=' + new_content;  var myAjax = new Ajax.Request(url, {method:'post', postBody:pars, onSuccess:success, onFailure:failure});}function editComplete(t, obj) {  obj.innerHTML = t.responseText;  showAsEditable(obj, true);}function editFailed(t, obj) {  obj.innerHTML = 'Sorry, the update failed.';  cleanUp(obj);}