根据输入的地址将坐标放入变量中

I am currently trying to allow users to type in a location and then reverse it into longitude and latitude coordinates which will then apply to latlng variable as opposed to set coordinates. At present I have a function that reverses the address entered into the SearchText into co-ordinates accordingly and alerts them. However I want to place these values within the latlng variable.I am currently trying to allow users to type in