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Subsequent we will use Google's occasion API to set off a customized occasion. We use the trigger() process, specifying the map example because the item that the development will originate from, locationAdd because the identify of our customized occasion, and move the development item that we now have labored with in our addMarker() functionality (stored in e) as a parameter to any handlers which may be listening for our customized occasion. We upload a handler for this occasion within the subsequent part. finally we will be able to set a different identification characteristic at the marker in order that we will be able to differentiate each one marker. we are going to desire this after we are looking to replace our UI following a marker drag, which we will examine a bit afterward. this can be every little thing we wish to do at this aspect whereas the clicks variable remains to be under or equivalent to one. the second one department of the outer conditional in our addMarker() functionality offers with occasions whilst clicks is bigger than 1. for that reason, we all know the map has already been clicked two times, so while this happens we wish to cease listening for clicks at the map. we will unbind our handler utilizing the development API's removeListener() approach. this technique easily takes a connection with the eventListener again via the addListener() strategy. once we bind the clicking occasion at the map to our addMarker functionality, we shop what's lower back within the mapClick variable, that's what's handed to the removeListener() process. At this element we must always manage to run the web page in a browser and upload new markers to the map through clicking at diverse destinations. categorized Intel We used a functionality expression during this activity, by means of assigning the development handler to a variable, rather than probably the extra regular functionality assertion. this is often normally thought of an outstanding perform, and whereas no longer crucial during this state of affairs, it really is definitely a very good behavior to get into. For an intensive realizing of why functionality expressions are in most cases greater than functionality declarations, see John Resig's weblog put up at http://ejohn. org/blog/javascript-asa-first-language/. sixty nine An Interactive Google Map Updating the UI with the beginning and finish destinations as soon as the 2 markers were further to the map, we wish to demonstrate their destinations within the UI sidebar on the correct of the web page prepared for after we compute the price of the adventure. we will are looking to convey the complete road handle of every position that's clicked and likewise upload a button that triggers the computation of a quote in line with the destinations that the customer has selected at the map. organize for elevate Off within the final activity we used Google's trigger() technique to set off a customized occasion every time a new marker used to be extra to the map following a click on. during this job we will upload a handler for that customized occasion. thus far during this venture, we now have caught virtually completely to Google's map API and have not rather used jQuery in any respect except so as to add the preliminary rfile. load wrapper for the remainder of code. during this a part of the undertaking we will rectify that and fan the flames of jQuery as a way to replace our UI. interact Thrusters The handler for our customized locationAdd occasion will be as follows, that are additional without delay after the mapClick variable from the final job: api.