angularjs - Protractor: addLocator() : 'Cannot read property 'querySelectorAll of null' ' -


i trying run standart example protractor's documentation ( http://angular.github.io/protractor/#/api?view=protractorby.prototype.addlocator ). , have error: 'cannot read property 'queryselectorall of null'

    by.addlocator('buttontextsimple',     function(buttontext, opt_parentelement, opt_rootselector  ) {     var using = opt_parentelement,         buttons = using.queryselectorall('button');     return array.prototype.filter.call(buttons, function(button) {         return button.textcontent === buttontext;         });     });

view same:

<button ng-click="doaddition()">go!</button>

what should solve problem?

you should declare variable called using this:

var using = opt_parentelement || document;

so if there no optional parent element provided, global document used query results.

not sure if typo in documentation or protractor expected auto-fill opt_parentelement variable defaults if not being set.


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