php - How to make web page display only recent update rather than reload using AJAX
973
I made a table on my web page, that reloads every ten seconds to get new information inputted by users, if any. The thing is, I don't want the whole table to reload every ten seconds, I just want the table to display only new updates that are not on the table already. Below is the code I used for reloading the page.
function process(xmlHttp, i) {
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0) {
//value = encodeURIComponent( objRef.value );
xmlHttp.open("GET", "php/AjaxBody.php?value=" + i, true);
xmlHttp.onreadystatechange = handleServerResponse;
xmlHttp.send(null);
} else {
alert("Hold on");
}
}
function handleServerResponse() {
if (test.readyState == 1 || test.readyState == 2 || test.readyState == 3) {}
if (test.readyState == 4) {
if (test.status == 200) {
txtResponse = test.responseText;
bodyDiv = document.getElementById("body");
bodyDiv.innerHTML = txtResponse;
} else {
alert("Error with the xmlHttp status");
}
}
/*
else{
alert("Error with the xmlHttp readystate: " + x.status);
} */
}
ThetxtResponse returns the whole table that is reloaded onto thediv =body, I would like to know how to go about this, and I would also like it to be native JavaScript ("I don't mind XML, to change the way the information is returned")
Answer
Solution:
I think you can add the limit in your url. Something like this should work fine.
Answer
Solution:
You could also add a datetime to your objects like a created date and a last modified date. Then do some checks and see if something is new.
Have a look at the javascript framework KnockoutJS if you want to some very complex changetracking, it does a lot for you but it has a relatively high learning curve.