Title: Javascript: TypeError: document.observe is not a function
Last modified: August 21, 2016

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# Javascript: TypeError: document.observe is not a function

 *  [bjoerne](https://wordpress.org/support/users/bjoerne/)
 * (@bjoerne)
 * [12 years, 9 months ago](https://wordpress.org/support/topic/javascript-typeerror-documentobserve-is-not-a-function/)
 * A javascript error occurs on the options page (…wp-admin/options-general.php?
   page=underConstructionMainOptions)
 * Firefox: TypeError: document.observe is not a function
    Chrome: Uncaught TypeError:
   Object #<HTMLDocument> has no method ‘observe’
 * document.observe seems to be a prototype.js function, but prototype is not available
   by default.
 * Used version of plugin 1.11.
 * [http://wordpress.org/plugins/underconstruction/](http://wordpress.org/plugins/underconstruction/)

The topic ‘Javascript: TypeError: document.observe is not a function’ is closed 
to new replies.

 * ![](https://ps.w.org/underconstruction/assets/icon-256x256.png?rev=2223095)
 * [underConstruction](https://wordpress.org/plugins/underconstruction/)
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## Tags

 * [chrome](https://wordpress.org/support/topic-tag/chrome/)
 * [Firefox](https://wordpress.org/support/topic-tag/firefox/)
 * [javascript](https://wordpress.org/support/topic-tag/javascript/)

 * 0 replies
 * 1 participant
 * Last reply from: [bjoerne](https://wordpress.org/support/users/bjoerne/)
 * Last activity: [12 years, 9 months ago](https://wordpress.org/support/topic/javascript-typeerror-documentobserve-is-not-a-function/)
 * Status: not resolved