Category: Openlayers 4 redraw map

Openlayers 4 redraw map

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. But there is one problem: one cannot determine whether the map view is completely loaded or a few tiles is missing yet. It seems there is no such API or event.

The close one is tileloadstart - tileloadend pair. But OpenLayers loads tiles asynchronously, and before the tile is actually loading the tileloadstart is not fired - that is, a tile that is queued in the tile queue does not fire the event before actually loading.

Works at least from OpenLayers 3. There is fine answer there about the subject.

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MeanwhileOpenLayers provides a much sought after rendercomplete event which may be handy. Basically to make sure everything is rendered on your map you need to listen for loadend events for each layer you have on the map. For wms and wfs layers this is clear and I guess you know how to do it. For the tile layerscheck this example here. Learn more. OpenLayers: How to detect the map view is completely loaded? Ask Question. Asked 4 years, 4 months ago.

Active 1 year, 2 months ago.

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Viewed 12k times. I'm implementing map exporting functionality using OpenLayers 3.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. When the user is fully zoomed in however, I want to turn off the clustering strategy so that all features are shown.

To do this I am catching the zoom event like this:. This kinda works, but I don't see the new clustering applied - I have to zoom back out again to see the clustering change to a threshold of and thus show all features. I need some way to force openlayers to refresh.

I've tried calling map. Any ideas? You should call redraw method on layer not map - this. I found the answer in this post. OpenLayers Cluster Recalculate. I solved the same problem thanks to this file: CenteredCluster. There are so many different information regarding this functionality in OL and the biggest problem is that nobody defines an OL version on which something works :.

None of the earlier answers worked for me.

OpenLayers 3 Beginner’s Guide

Use like: vectorLayer. Learn more. OpenLayers: How to refresh map after changing the vector layer Ask Question. Asked 7 years, 11 months ago. Active 7 months ago. Viewed 42k times. To do this I am catching the zoom event like this: map.

No matter what. Matt Roberts Matt Roberts Active Oldest Votes. Kliver Max Kliver Max 4, 19 19 gold badges 76 76 silver badges bronze badges. I found that in openlayers 3 you need to call refresh on the source object, not the layer. Thanks, but I tried that too, and it didn't work although I think it should! I'm not sure, but you could also try to call refresh method on layer.

I would also try calling deactivate method on strategy instead of setting high treshhold - this. You can also try to listen to map's "movestart" instead of "zoomend". I think features are not drawn yet on movestart so you have better chance to prevent things from happening.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. I have a geojson layer in my OL3 app which I want to redraw every 5 seconds to show movement on map. I know that this question is old but i've finally found a solution to refresh a layer on openlayers 3.

Below is a self calling function that will use an ajax request to fetch the GeoJSON and then read it and add it to a source. There is no need to refresh explicitly. Each time you update the content of a layer the map is refreshed requesting a new frame rendering. To force rendering manually you have map. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Equivalent of layer.

Ask Question. Asked 5 years, 6 months ago. Active 3 years, 4 months ago. Viewed 23k times. How do I do it? Couldn't find the equivalent of Layer. Alophind Alophind 2, 4 4 gold badges 33 33 silver badges 69 69 bronze badges. Have you looked at ol. In general, vector drawing is smoother and handled differently in ol3, but it isn't entirely clear from your question what you are wanting to do. I want to redraw the layer to show each time the current position of the units on the map it keep changing So, you are requesting data every 5 seconds using a recursive setTimeout call or something similar and you just want to know how to force the vector features to refresh?

Sure, I get what you are trying to do. Any chance of a code sample, because in my experience, if you put an animation loop in settimeout, with an ajax call to a remote server, and load the json that comes back using Format. GeoJSON or similar, the features will get updated.

Active Oldest Votes. GeoJSON ; window. This code confuses me, should vectorSource and geojsonSource be merged?We can also pull features as vectors and draw them on top of a base map. One of the advantages of serving vector data is that users can interact with the data.

In this example, we create a vector layer where users can select and view feature information. Open map.

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Next add a vector layer that requests the most important places of New York City. Because this data will be rendered client-side i.

openlayers 4 redraw map

Somewhere in your map initialization after the map object is createdadd the following code to create a vector layer that uses the WFS protocol:. A filter is an object that declares some conditions over the data. OpenLayers add this condition to the requests to the server using the proper language depending on the protocol, if supported. The complete WFS request data bounding box and filter looks like this:.

With the landmarks layer requesting and rendering features, we can create a control that allows users to select them. In your map initialization code, add the following after the creation of your buildings layer:. Save your changes to map. To see feature selection in action, use the mouse-click to select a building:. Using a control to select features from a vector layer. This section will complete the bonus exercise proposed on your first approach to OpenLayers vector data.

We can use layer events to respond to feature selection. This is useful for displaying specific feature information to the user. The featureselected event is triggered on a vector layer each time a feature is selected. Here we add a listener for this event that will display feature information below the map.

First we need to add an element to display the feature information. Finally, we create a listener for the featureselected event that will display feature information in the output element. Insert the following in your map initialization code after the creation of the landmarks layer:. See how we get the area from the geometry object. As we are dealing with geographic coordinates, OpenLayers provide a getGeodesicArea. When we work with projected coordinates we should use instead the getArea method.

Save your changes and refresh the map.

GETTING STARTED WITH POSTGIS , GEOSERVER AND OPENLAYERS

Displaying building information on feature selection.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project?

Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. However, this does not even trigger a GET request on the source in many cases. On the other side ol. I expected it to just clear all features from the source but it also fetched up-to-date data from the source. Can anyone reproduce this? Did I misunderstand documentation here? Maybe this also is a chance to improve documentation.

By the way, thank you very much, all of you, for your work and time spent on this project. I'm waiting from the beginning for this functionality. Unfortunately till now without result. I hope something going forward :. And my issues, closed. The issue I had before was random fid for features. GeoServer set random fid Unfortunately I hadn't id field on my source data.

When I set field id on my Postgis source data then have no more endless refresh features. I think the confusion here is that for sources configured with a url and withoug strategyol.

openlayers 4 redraw map

Vector clear does what people would expect refresh to do. But the latter simply dispatches a 'change' event, nothing else. A pull request could change the behavior of both methods, so that clear does not reload features, and refresh always reloads features, even when the source was configured with a strategy. I finally had a look at the source, because I want to fix this. I think ol. Vector clear doesn't need to be changed, it does exactly what one would expect.

Openlayers-3 Force a map refresh

However, I don't exactly understand why it triggers a refresh. If the source was refreshed because clear emits a 'change' event, then refresh should trigger a refresh as well since it emits a 'change' event as well.

The loading is done by the loadFeatures method. This method is called by the renderer every time the source dispatches a change event. Line in a Would overriding ol. Vector refresh with a call to clear solve the confusion while retaining functionality for all other sources? For example:. If a source is added to a map, then only refresh makes sense because it combines the two actions.

Should be fixed by Skip to content.Instances of OpenLayers. Vector are used to render vector data from a variety of sources. Create a new vector layer with the OpenLayers. Vector constructor. Listeners will be called with a reference to an event object. The properties of this event depends on exactly what happened.

Default is false. Set this property in the layer options. Note that setting this to true will move the layer to the bottom of the layer stack. Add to this list to add support for additional renderers. Ask the layer to request features again and redraw them.

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Triggers the refresh event if the layer is in range and visible. Remove it. Otherwise, give the renderer a reference to the map and set its size. Called at the end of the map. At this point, the map will have a base layer. Any autoActivate strategies will be activated here.

Notify the renderer of the change of extent, and in the case of a change of zoom level resolutionhave the renderer redraw features. Remove features from the layer.

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The beforefeatureremoved and featureremoved events will be triggered for each feature. The featuresremoved event will be triggered after all features have been removed. To suppress event triggering, use the silent option. Draw or redraw a feature on the layer. If the optional style argument is included, this style will be used. This function is not designed to be used when adding features to the layer use addFeatures instead.

It is meant to be used when the style of a feature has changed, or in some other way needs to visually updated after it has already been added to a layer.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Users have had success with updateParams.

But I think we should make it consistent across all sources so clear triggers a reload, like it already does for ol. For tile sources, it would mean that the tile cache is cleared. We'd accept a pull request for that. There's already a refresh method in ol. Tile but it calls changed right after clearing the tileCachewhich causes the map to render the cleared tiles before reloading.

Should this be modified by repopulating the cache with loaded tiles in current extent and resolution before calling changed? Or is the refresh method intended as it is? Not sure what you mean. That refresh does not work as intended? All I'm saying is that we should have a consistent way of re-fetching data from all sources. What I'm trying to achieve is updating the source parameters and re loading the tiles with the new parameters without the previous tiles disappearing.

Is there any way to do this?

openlayers 4 redraw map

In answer to your question, from what I see in the code, refresh seems to aim at doing for ol. Tile what clear does for ol. Vectorwhich is, as you suggested in the first reply, clearing the tileCache and calling changedtriggering a reload.

It doesn't actually work because I think the tiles are rendered from the tileCacheForProjection on the ol. TileWMS and not the tileCache. Clearing the tileCacheForProjection and calling changed does trigger a reload.

But I might be missing something here :. Reopening, because it seems that we 1 want to rename refresh to clearand 2 make it so it also clears tile caches in other projections.

Again, might have missed something, will confirm ASAP.


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