How to efficiently load 3000 objects in Openlayers using IE8

Question

How to efficiently load 3000 objects in Openlayers using IE8

One of my clients exclusively uses IE8 and is working with an openlayers map. He is trying to load 3000 polygons onto the map, which Chrome and IE9 can handle without any issues. However, IE8 freezes when attempting to load the objects. These objects are coming from a web service as JSON XML, being parsed and then added to the vector layer. IE8 throws an exception when trying to add the objects:

"Stop running this script? A script on this page is causing Internet Explorer to run slowly ..."

I have attempted to load the features using multithreading, but it proves to be too slow.

Does anyone have any ideas on how to resolve this issue in IE8?

javascript internet-explorer-8 openlayers

Answer 1

Answer №1

It is important to handle features efficiently when adding them to the vector layer. One approach could be to loop through each feature and add it individually like this:

for(var feat in feats) {
   vectorLayer.add(feats[feat]);
}

Alternatively, you could consider using a recursive function for better performance. Adding a small timeout to the recursive function call can also help manage the loading process, especially when dealing with a large number of features. This way, you can monitor the progress and potentially add a progress bar to enhance the user experience. Here is an example:

//global
var features;

function processFeatures() {
   if (features[0] != null) {
      vectorLayer.add(features[0]);
      features.splice(0,1);
      processFeatures(); // or use setTimeout(processFeatures, 1);
   }
}

Answer 2

It is important to handle features efficiently when adding them to the vector layer. One approach could be to loop through each feature and add it individually like this:

for(var feat in feats) {
   vectorLayer.add(feats[feat]);
}

Alternatively, you could consider using a recursive function for better performance. Adding a small timeout to the recursive function call can also help manage the loading process, especially when dealing with a large number of features. This way, you can monitor the progress and potentially add a progress bar to enhance the user experience. Here is an example:

//global
var features;

function processFeatures() {
   if (features[0] != null) {
      vectorLayer.add(features[0]);
      features.splice(0,1);
      processFeatures(); // or use setTimeout(processFeatures, 1);
   }
}

How to efficiently load 3000 objects in Openlayers using IE8

Answer №1

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