Dojo Node Is Null Error
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frustrating chore. To compound the already difficult task of debugging, browser vendors each have their own style dojo require is not defined of error messaging, some of which are confusing, cryptic, or downright uncaught referenceerror dojo is not defined misleading to the untrained eye. Through the delivery of our Dojo workshops, we've observed a number dojo error multipledefine of common mistakes that are easy to fix once you decipher the error message. Take some time to familiarize yourself with the following common errors that dojo cannot read property 'on' of undefined appear when working with Dojo, their symptoms, and their solutions. With this knowledge, writing manageable code is not only possible, but a lot less cryptic. Issue: Missing Parameter What you're likely to see in your debugging environment Firefox + Firebug ReferenceError: on is not defined Chrome Uncaught ReferenceError: on is not defined Internet Explorer
Dojo.require Is Not A Function
9 The value of the property ‘on' is null or undefined, not a Function object Possible Cause You are missing a module parameter in the callback function of require. As you can see in the example, we list dojo/on as a dependency, but forget to specify it as a parameter to our callback function. As such, whenever we attempt to reference it, it fails because it is undefined. require(["dojo/dom", "dojo/on"], function (dom) { on(dom.byId("button"), "click", function (e) { console.log("My button was clicked!"); }); }); Solution Ensure you specify a callback parameter for each module that you're including to which you will need locally scoped access. If you're getting a ReferenceError or "not a Function", chances are, you missed a parameter. Issue: Callback Parameter Mismatch What you're likely to see in your debugging environment Firefox + Firebug TypeError: dom.byId is not a function Chrome Uncaught TypeError: Object function has no method ‘byId' Internet Explorer 9 Object doesn't support
as Inappropriate ♦ ♦ the dreaded node is null error I was trying to get a widget I made to work but I got the dreaded node is null
Dojo Is Undefined
error. Inevitably, this is because I'm trying to put the widget in a node dojo domready that doesn't exist eitehr because dojo.byId failed or I misspelled the id in a placeAt. My page has a number uncaught (in promise) domexception: failed to load because no supported source was found. of widgets which make reference to a bunch of nodes. So how do I know which one failed? I did the debug=true on unbuilt dojo. I even did the debugAtAllCosts=true. I finally just stepped https://www.sitepen.com/blog/2012/10/31/debugging-dojo-common-error-messages/ through the postCreate portion of every widget that didnt' seem to be made and found it, but is there some way to get firebug to throw an error that makes reference to a line that exists? It currently references bootstrap line 857 or some such and bootstrap.js is only 500 lines long. ________________________________________________________ Dojotoolkit: http://dojotoolkit.orgReference Guide: http://dojotoolkit.org/reference-guideAPI Documentation: http://dojotoolkit.org/apiTutorials: http://dojotoolkit.org/documentation[hidden email] http://mail.dojotoolkit.org/mailman/listinfo/dojo-interest Mark1010 Reply | Threaded Open this post http://dojo-toolkit.33424.n3.nabble.com/the-dreaded-node-is-null-error-td3406821.html in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: the dreaded node is null error Don't add anything to a node if you don't know it's there. Test for it.var node = dojo.query ('.ihopeYoureThere');if (node && node.length > 0){ dojo.place (myWidget.domNode, node[0]);}else { console.log ("HEY, WHERE IS MY NODE???");}From: dojonewb <[hidden email]>To: [hidden email]Sent: Sunday, October 9, 2011 1:23 AMSubject: [Dojo-interest] the dreaded node is null error I was trying to get a widget I made to work but I got the dreaded node is nullerror. Inevitably, this is because I'm trying to put the widget in a node thatdoesn't exist eitehr because dojo.byId failed or I misspelled the id in aplaceAt. My page has a number of widgets which make reference to a bunch ofnodes. So how do I know which one failed? I did the debug=true on unbuiltdojo. I even did the debugAtAllCosts=true. I finally just stepped through thepostCreate portion of every widget that didnt' seem to be made and found it, butis there some way to get firebug to throw an error that makes reference to aline that exists? It currently references bootstrap line 857 or some such andbootstrap.js is only 500 lines long.________________________________________________________Dojotoolkit: http://dojotoolkit.orgRef
for 'node is null' error Reported by: youngstuart Owned by: toonetown Priority: high Milestone: 1.3 Component: DojoX Widgets Version: 1.2.1 https://bugs.dojotoolkit.org/ticket/8226 Keywords: Cc: Blocked by: Blocking: Description I'm not sure if this has been attended to already but I couldn't find it on this https://groups.google.com/d/topic/dotcms/wihqNSVDKl4 site so I thought I would post this as a FYI. Problem: I encountered a 'node is null' error with FilePicker.js. Here's how I is not produce the error: Click on a file (non-directory) node, which displays the file details in the next pane Click on a directory (non-file) node, which should display the rolling list of files in the next pane, but instead gives this console error in Firefox: 'node is null' require is not in dojo/html.js at line 29 (in the function dojo.html._emptyNode). Solution: I traced it back to the _removeAfter function of RollingList which FilePicker inherits from. The error can be fixed by replacing line 481 in dojox.widget.RollingList: c.destroyRecursive(); c.destroy(); Cheers, youngstuart Oldest first Newest first Threaded Comments only Change History (3) comment:1 Changed 8 years ago by peller Component changed from General to DojoX Widgets Owner changed from anonymous to toonetown comment:2 Changed 8 years ago by toonetown Milestone changed from tbd to 1.3 Priority changed from normal to high comment:3 Changed 8 years ago by toonetown Resolution set to fixed Status changed from new to closed This has been fixed for 1.3 Note: See TracTickets for help on using tickets. Download in other formats: Comma-delimited Text Tab-delimited Text RSS Feed Powered by Trac 1.0.9 By Edgewall Software. Visit Dojo athttp://dojotoolkit.org/
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