I am using this code to loop through an array and call a function doAjax()
for each value
:
$.each(categories, function(index, value){
doAjax(value);
});
The function doAjax()
will make a Ajax call and append some data to an html page. The problem is that when I loop through large array (10+ indexes) it is causing my website to crash.
The only way I can think to solve this problem is to make listener to the page like this:
$(window).scroll(function(){
if($(window).scrollTop() + $(window).height() >= $(document).height() - 50){
//code to trigger function goes here
}
});
so when the user scroll to the bottom of the page it will load more stuff.
So I want to make my $.each
only call doAjax()
3 or 4 times. The problem I ran into is that its calling the same values from the array so I made a temporarily variable and stored my original array in it like so:
var temp = categories;
and then every time $.each
runs, I delete the value from the temp array.
I know this is not he best way to do stuff, but this what I was able to think of.
If you can suggest a better way to solve this problem that will be appreciated. Otherwise I want my $.each to run at least once (and loop through 3 or 4 elements only) when the doc loads, then delete the array elements that it already went through, then run again (only through 3 or 4 elements)when the user scroll to the bottom of the page until there is no more elements in the temp array..
To loop and remove the categories array try,
function sendAjax(cat) {
if(cat.length>1){
var len = ( cat.length > 3 ) ? 3 : cat.length;
for (var i = 0; i < len; i++) { //send ajax 3 times
if (typeof cat[i] != "undefined") {
// doAjax(cat[i]);
}
}
}
cat = cat.splice(len);//remove the first three elements from array
return cat;
}
how about appending all the results of your array => doAjax function, then once its all done, then append to your page.. ala
this might work for reducing the array:
var arr2 = categories.splice(0); // copy the original categories array to a new array
var rotationNum = 3;
function sendIt(){
var lngth = (arr2.length < rotationNum) ? arr2.length : rotationNum;
for (var i = 0; i < lngth ; i++){
//doAjax
}
arr2.splice(0,lngth);
}
or try below to store up all the ajax calls, then append.
var categoriesDeferred = [];
for(var i = 0; i < categories.length; i++){
categoriesDeferred.push(doAjax(categories[i]));
}
$.when.apply($, categoriesDeferred).then(everythingDoneFunc);
function doAjax(data) {
var dferred = $.Deferred();
//your ajax call here.. .
setTimeout(function() { dferred.resolve() }, 2000);
return dferred.promise();
}
function everythingDoneFunc(){
console.log('everything processeed');
}
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