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       
(Showing Draft Content)

增量加载

根据数据的不同,加载非常大的文件可能会花费一些时间和/或达到浏览器功能的极限。所以,每当你试图加载一个大文件的数据或公式嵌入,建议使用增量加载特性来缩短数据处理时间和优化装载过程。

增量加载特性首先加载带有一些数据的活动表单,然后在后台逐段加载其余数据,如公式、单元格值和定制名称。当使用fromJSON函数加载数据时,可以在选项中将 incrementalLoading 设置为true。您还可以使用incrementalLoading中的回调函数来获取加载状态,或者设置加载完成后要执行的下一个动作。还可以通过将 doNotRecalculateAfterLoad 设置为false来指定在加载数据之后是否重新计算单元格值。

每当在数据加载过程中执行任何UI事件时,SpreadJS首先处理该事件,然后在表单中加载其余的数据。

注意: 每当在数据加载过程中执行任何UI事件时,SpreadJS首先处理该事件,然后在表单中加载其余的数据。 下面的示例递增地在表单中加载一个JSON文件。

使用代码

这段代码展示了如何使用增量加载加载JSON文件。

var incrementalEle = document.getElementById("incremental");
var loadingStatus = document.getElementById("loadingStatus");
function fromJSON(json) {
if (incrementalEle.checked) {
spread.fromJSON(json, {
incrementalLoading: {
loading: function (progress) {
progress = progress * 100;
document.getElementById("statusBarDiv").innerText = "Loading: " + progress.toFixed(2) + "%";
loadingStatus.value = progress;
},
loaded: function () {
document.getElementById("statusBarDiv").innerText = "Finish";
}
}
});
} else {
spread.fromJSON(json);
}