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Add a debouncer to render() in slick.grid.js #1044

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Add a debouncer to render() in slick.grid.js #1044

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20 changes: 18 additions & 2 deletions slick.grid.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,22 @@
* and do proper cleanup.
*/

//function took from underscore.js
function debounce(func, wait, immediate) {
var timeout;
return function() {
var context = this, args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
};

// make sure required JavaScript modules are loaded
if (typeof jQuery === "undefined") {
throw "SlickGrid requires jquery module to be loaded";
Expand Down Expand Up @@ -1941,7 +1957,7 @@ if (typeof Slick === "undefined") {
}
}

function render() {
var render = debounce(function(){
if (!initialized) { return; }
var visible = getVisibleRange();
var rendered = getRenderedRange();
Expand All @@ -1964,7 +1980,7 @@ if (typeof Slick === "undefined") {
lastRenderedScrollTop = scrollTop;
lastRenderedScrollLeft = scrollLeft;
h_render = null;
}
}, 250);

function handleHeaderRowScroll() {
var scrollLeft = $headerRowScroller[0].scrollLeft;
Expand Down