Belajar Komputer & Gadget

The  HTML5   IndexedDB  is still in the working draft stage and not fully implemented in major Internet browsers yet. Nevertheless, I tried to use its asynchronous API to develop a  Google Maps  application. It took me a little while to figure out how to update an existing record in the IndexedDB  database store. This can be done by opening a read-write cursor to the record to be updated. Then call the cursor  update  method to replace it with the new record. An example Javascript code snippet is shown below. try { var objDb; //the database to update var store = 'myStore' ; //the database store to update var key = 88; //the key of the existing record to update var newRec = 'hello world' ; //the new record var objStore = null ; var objTrans = null ; var objCursor = null ; var objKeyRange = null ;   //...etc...open the database....etc... //open a read-write transaction objTrans = objDb.transaction(store,...

<SCRIPT LANGUAGE= "JavaScript" > var theImages = new Array()          theImages[0] = 'iphone-FASTEST.jpg'        theImages[1] = 'apple-3gs-0.jpg'        theImages[2] = 'apple-iphone-3gs-2-0.JPG'        theImages[3] = 'iphone-accessibility.jpg'        theImages[4] = 'iphone-cutcopypaste.jpg'                     var j = 0 var p = theImages.length; var preBuffer = new Array()   for (i = 0; i < p; i++){ preBuffer[i] = new Image() preBuffer[i].src = theImages[i] } var whichImage = Math.round(Math.random()*(p-1));   function showImage(){ if (whichImage==0){ document.write( '<a href ="link.html"><img src="' +theImages[whichImage]+ '" border=0 width=452 height=181></a>'...