topic Re: google map zoom slider query in QlikView

google map zoom slider query

hopkinsc — Thu, 06 Nov 2014 12:18:32 GMT

Hi all,

I have a google map in my application with a slider which zooms in and out.

i was wondering if there was a way i could reverse the slider as currently if i slide up it zooms out and slide down it zooms in but usually its the other way around, so i want the map to zoom in when i slide up and zoom out when i slide down.

does anyone have any ideas please?

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 12:23:08 GMT

if you're using a zoom table linked to a slider object, i use SORT property NUmeric ASC/DESC

Re: google map zoom slider query

hopkinsc — Thu, 06 Nov 2014 12:27:16 GMT

Hi Jonathan,

I am using a variable for the Zoom, I can't change anything on the sort tab

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 12:33:30 GMT

i see, from the google map guide there is already a zoom table generator, personally i load inline the zoom table with values i needed.

I haven't really thought of using variable for zoom, but i have a feeling it is also in the SORT prop, will try that today.

btw, this is my 500th point. yahooo!

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 13:03:53 GMT

i think i manage to crack it mate,

for min/max, i used -3/-12 respectively,

slider saves value to variable (vZoomValue)

afterwards, i used FABS() on zoom to make the negative go Positive

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 13:08:55 GMT

FABS(vZoomValue)

Re: google map zoom slider query

hopkinsc — Thu, 06 Nov 2014 13:09:42 GMT

congrats on your 500th point!

any chance you have an example?

Re: Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 13:28:06 GMT

attached a sample Mapquest (not google, but should be the same).

Ive added the slider objects, linked to variable,

there is a trigger for "vZoomValue" "OnChange" to "Select in Field" "%zoomlevel"

Re: google map zoom slider query

hopkinsc — Thu, 06 Nov 2014 16:37:45 GMT

Hi Jonathan,

Sorry, its probably me being stupid, but i can't see how your slider interacts with the map. the slider uses the VZoom_Value but how does the map know to respond to that variable?

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 16:48:54 GMT

if you got to Documenty Properties (ctrl+alt+D)>>Triggers tab.

on Variable Event Triggers>> vZoomValue

i added an OnChange Trigger to "Select in Field"

Re: google map zoom slider query

hopkinsc — Thu, 06 Nov 2014 16:58:48 GMT

Hi Jonathan,

yep i can see that and i have done the same. but i cant see either vZoomValue or %Zoom_Level in the chart itself. so how does it know to zoom in and out from the slider.

the reason i ask is that my map won't change by using the slider that you are using but it will change using my slider which user Var_Zoom variable.

I can see Var_Zoom in my expressions and min/max axis but yours are exactly the same as mine but you are using a different variable in your slider.

Am i missing something?

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 17:07:26 GMT

have a look at Table Viewer (Ctrl+T),

see what field name you have for zoom table, for my attached file,

i have a table = %Zoom_Level

and a field = %Zoom_Level,

you should have a table for zoom, as if you dig in to the script, there is a bit of formula to computer map variables.

in your script, dont you have a pice of code like below:

Load RecNo( ) as %zoom_level autogenerate(max_zoom_level);

this is what generated the zoom values

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 17:11:54 GMT

yep i can see that and i have done the same. but i cant see either vZoomValue or %Zoom_Level in the chart itself.

at Script level, there is a variable var_zoom, which is a formula which will make use of another variable %zoom_level,

%zoom _level is the one you want to fiddle with so var_zoom can make the computations.

Re: google map zoom slider query

jpenuliar — Thu, 06 Nov 2014 17:15:07 GMT

have a go at step by step guide, I believe it explains a bit of which code you can modify and which one r not.

Re: google map zoom slider query

Fri, 10 Apr 2015 07:18:04 GMT

Could you please help me on this

plot the dots (symbols) at different location