HTML and CSS Reference
In-Depth Information
prevbutton.onmousedown = prevButtonDown;
nextbutton.onmousedown = nextButtonDown;
checkButtons();
loadFile();
}
// disable previous or next button depending on whether
first or last message is displaying
function checkButtons() {
if ( messageID == 1 ) prevbutton.disabled = true;
else prevbutton.disabled = false;
if ( messageID == 3 ) nextbutton.disabled = true;
else nextbutton.disabled = false;
}
// decrement message ID when previous button is pressed
function prevButtonDown() {
messageID--;
if (messageID < 1) messageID = 1;
checkButtons();
loadFile();
}
// increment message ID when next button is pressed
function nextButtonDown() {
messageID++;
if (messageID > 3) messageID = 3;
checkButtons();
loadFile();
}
// load message files using Ajax
function loadFile() {
var file = "message"+messageID+".txt";
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = responseReady;
xmlhttp.open("GET",file,true);
xmlhttp.send();
}
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