suyogAgent

i am using following code for retriving organizations.

   client.request('/api/v2/search.json?'+encodeURI('query=type:organization name:'+searchString+'*')).then(updateUI);

i want to filter using by checking if the custom field is null or not.
but the filtering is not working.
i have tried using custom_field_=none

client.request('/api/v2/search.json?'+encodeURI('query=type:organization name:'+searchString+'*')).then(updateUI);

but didn't worked.

i am using following code to retrieve organizations.

client.request('/api/v2/search.json?'+encodeURI('query=type:organization name:'+searchString+'*')).then(updateUI);

i want to sort results according to alphabetical order of organizations names. i have tried sort_by parameter but didn't worked.

Thank you so much.

i am developing a zendesk application using Zendesk Application Framework. I want to get the agent data/agent id of the currently logged in agent for that instance of application in a application. how can i get it using client object.
in short what i want to is to fill the custom field along with the id of agent who filled it using Zendesk application.