How to select an element in ng-autocomplete in protractor?

Passing text through

sendKeys("dublin,south Africa");

It is unable to select the first element in autocomplete.

issue resolved.

this.checkin = function(text,index){
        element( by.css('[ng-click="showMapTextBox2()"]') ).click();
        // element(by.model("location")).sendKeys(text);
        browser.actions()
        .mouseMove(element(by.model("location"))
        .sendKeys(text))
        .perform().then(function(){
        browser.sleep(500);
        // press the down arrow for the autocomplete item we want to choose
        for(i = 0; i < index ; i++){

            browser.actions().sendKeys(protractor.Key.ARROW_DOWN).perform();
        }
        browser.sleep(500);
        browser.actions().sendKeys(protractor.Key.ENTER).perform();
      });
        browser.sleep(3000);
    };

spec_test code:

post_text.checkin("new Delhi, India",1);