Uncaught TypeError: Cannot read property 'length' of undefined

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Hi,

on the Contact Form, I sometimes get the following error when leaving/reloading it:

Microsoft Dynamics CRM Error Report Contents

<CrmScriptErrorReport>
  <ReportVersion>1.0</ReportVersion>
  <ScriptErrorDetails>
   <Message>Uncaught TypeError: Cannot read property 'length' of undefined</Message>
   <Line>1</Line>
   <URL>/_static/_common/scripts/jquery1.7.2.min.js?ver=-385083350</URL>
   <PageURL>/main.aspx?etc=2&extraqs=%3f_gridType%3d2%26etc%3d2%26id%3d%257b3E8A660C-180C-E411-80DF-005056BE4542%257d%26rskey%3d%257b00000000-0000-0000-00AA-000010001003%257d&pagemode=iframe&pagetype=entityrecord&rskey=%7b00000000-0000-0000-00AA-000010001003%7d</PageURL>
   <Function>anonymousr:Cannotreadproperty'length'ofundefined</Function>
   <CallStack>
    <Function>anonymousr:Cannotreadproperty'length'ofundefined</Function>
   </CallStack>
  </ScriptErrorDetails>
  <ClientInformation>
   <BrowserUserAgent>Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36</BrowserUserAgent>
   <BrowserLanguage>undefined</BrowserLanguage>
   <SystemLanguage>undefined</SystemLanguage>
   <UserLanguage>undefined</UserLanguage>
   <ScreenResolution>1920x1200</ScreenResolution>
   <ClientName>Web</ClientName>
   <ClientTime>2014-12-12T08:18:11</ClientTime>
  </ClientInformation>
  <ServerInformation>
    <OrgLanguage>1033</OrgLanguage>
    <OrgCulture>1033</OrgCulture>
    <UserLanguage>1033</UserLanguage>
    <UserCulture>1033</UserCulture>
    <OrgID>{B7D590B3-C8AE-E311-80BD-005056BE2160}</OrgID>
    <UserID>{3F12AE6B-3FAF-E311-80BD-005056BE2160}</UserID>
    <CRMVersion>6.1.1.132</CRMVersion>
  </ServerInformation>
</CrmScriptErrorReport>

This happens quite a lot to me. Is this a CRM bug or is some of my custom code causing a problem here?

Best regards

Michael

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Royal King 27,686 on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

Are you using jquery in your web resource file? if so it might be from script

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Community Member on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

Hi Chitra,

yes, I am using jquery 2.1.1 wrapped in my own namespace to avoid conflicts with the CRMs jquery in the following way:

var isConflictedEnvironment = typeof $ !== 'undefined'; if (isConflictedEnvironment) { Type.registerNamespace('tv'); } // jquery 2.1.1 source code if (isConflictedEnvironment) { tv.$ = jQuery.noConflict(true); }

So my jQuery instance lives within the "tv" namespace and should not conflict with the global $ alias used by the CRM. Do you think that's causing the error within jquery 1.7.2 used by the CRM?

Regards

Michael

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Royal King 27,686 on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

the error is not in jquery. Some where in your script you are trying to get length of the object using jquery or trying apply some operation but object is null. check null value before applying any operation on the object in your script

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Hosk on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

Check your Javascript code where you are using length e.g. field.length.

The error is saying that the variable is null and you can't get the length of a null variable.

You need to do a null check before using the length value

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ScottDurow 21 on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

It is possible that your jquery registration is causing the issue - but the simplest way will be remove this JavaScript and see if it no longer happens!

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Community Member on at

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RE: Uncaught TypeError: Cannot read property 'length' of undefined

So, by accident I stumbled over the real culprit here: I am also using jQuery UI 1.11.2 in some of my scripts which is designed to work with jQuery 2. Sometimes, jQuery UI was loaded before my jQuery instance was initialized in tv.$ and then UI just used jQuery 1.7.2 provided by the CRM. This caused some error inside the CRMs jQuery 1.7.2, which led me to assume this is a bug within the CRM, but it was actually caused by jQuery UI.

I guess this is because the CRM loads JS Webresources asynchronously?

I now enhanced my jQuery wrapper a check if my jQuery instance has been loaded yet (inspired by Scott's blog entry here, thanks btw. Your blog has been of great help to me :) ).

Thanks your help, guys!

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