callbackexample.js

来自「Introduce AJAX, can learn more thing.」· JavaScript 代码 · 共 43 行

var itemList, itemQuantityDisplay, progressDisplay;

function onCallbackComplete(result, context){
    progressDisplay.style.display = "none";

    itemQuantityDisplay.className = "";
    itemQuantityDisplay.style.display = "";
    itemQuantityDisplay.innerHTML = result + " in stock";
}

function onCallbackError(){
    progressDisplay.style.display = "none";

    itemQuantityDisplay.className = "Error";
    itemQuantityDisplay.style.display = "";
    itemQuantityDisplay.innerHTML = "Error retrieving quantity";
}

function getSelectedItemID()
{
    return itemList.value;
}

function itemList_OnChange()
{
    document.getElementById("ProgressDisplay").style.display = "";
    document.getElementById("ItemQuantityDisplay").style.display = "none";
    DoClientCallBack();
}

window.onload = function() {
    itemList = document.getElementById("ItemList");
    itemQuantityDisplay = document.getElementById("ItemQuantityDisplay");
    progressDisplay = document.getElementById("ProgressDisplay");

    if (itemList.attachEvent) {
        itemList.attachEvent("onchange", itemList_OnChange);
    }
    else {
        itemList.addEventListener("change", itemList_OnChange, false);
    }
}