Error Has No Properties
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/No_properties community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up TypeError “null has no properties” when adding controls up vote 0 down vote favorite nokia newbie here. I have added simple (from sample) code to display a map with the various controls on it. http://stackoverflow.com/questions/23565044/typeerror-null-has-no-properties-when-adding-controls The map displays ok but non of the controls display and the error "TypeError: null has no properties" error displays in the console. I have tried things like adding the controls one at a time but adding any control generates the error. I have searched for this but not found anything. It has to be really simple surely. An excerpt from the code is below. Any help would be appreciated { nokia.Settings.set("app_id", "myid"); nokia.Settings.set("app_code", "mycode"); // Use staging environment (remove the line for production environment) nokia.Settings.set("serviceMode", "cit"); (document.location.protocol == "https:") && nokia.Settings.set("secureConnection", "force"); var mapContainer = document.getElementById(mySelf.options["id"]); // Create a map inside the map container DOM node if(mySelf.options["controls"] == true){ controls = [ new nokia.maps.map.component.ZoomBar(), new nokia.maps.map.component.Behavior(), new nokia.maps.map.component.TypeSelector(), new nokia.maps.map.component.Traffic(), new nokia.maps.map.component.PublicTransport(), new nokia.maps.map.component.DistanceMeasurement(), new nokia.maps.map.component.Overview(), new nokia.maps.map.component.ScaleBar(), new nokia.maps.positioning.component.Positioning(), new nokia.maps.map.component.ContextMenu(), new nokia.maps.map.component.ZoomRectangle(), new nokia.maps.map.component.TrafficIncidents() ]; } else { controls = [ ]; } this.map = new nokia.maps.map.Display(mapContainer, { center: [52.51, 13.4], zoomLevel: 10, components: c
mongodb You got to love debugging JavaScript errors. Here’s one http://code.dblock.org/2012/11/29/debugging-object-has-no-properties-in-a-mongodb-mapreduce.html from a MongoDB map/reduce. The operation fails with this: 04:39:41 Database command 'mapreduce' failed: ( assertion: 'map invoke failed: JS Error: TypeError: spline has no properties nofile_b:7'; assertionCode: '9014'; errmsg: 'db assertion failure'; ok: '0.0'). Examining the MongoDB log we notice that the map/reduce completes to error has about 70%, so this is caused by some data inside the database. In this case the issue is in the spline object being accessed by the map function. Indeed, the map tries to fetch spline.reticulated, which is hopefully a Boolean value. The error “spline has no properties” error has no is, generally, another way of saying “spline is null”. In my case splines live in an embedded collection inside bones, and aren’t expected to be null, so I need to track down a null spline inside bone.splines. While we can just look for a null embedded object, more generally, we can find whether a JS object has no properties with this isEmpty function from SO. Declare it in the mongodb console (use a 1-liner): function isEmpty(map) { for(var key in map) { if (map.hasOwnProperty(key)) { return false; } } return true; } Iterate over all bones records. db.bones.find().