ArcGIS JS map internal and external network environment judgment

In order to read intranet server resources in Intranet environment , Read the content of the simplified version under the external network environment .

Plan to access the intranet interface , If the return is successful , It means the Intranet environment ; If no content is returned , The Internet .

The map library has passed TypeScript build , More complicated , A lot of code .

Scheme 1

adopt dojo.xhr modular , Request test interface , And set the parameter to {sync:true,timeout:200}

Because the existing map library is a synchronous structure , therefore , Use sync request here , And set the timeout to 200, stay 200ms after , After determining the internal and external network environment, execute the subsequent code .

Found after testing , Functional implementation requirements . In effect ,timeout Invalid parameter , The request is generally stuck 21 About seconds , To judge the internal and external network environment .

Inquire about dojo Official information , When synchronizing a request ,timeout Invalid parameter .

20 The delay of many seconds is unacceptable , It doesn't work . We can only change the scheme

Option two

Use the asynchronous request scheme

Found by test ,xhr When asked , It can be quickly judged that it is the intranet and Internet environment , So I decided to adopt an asynchronous method .

Since most of the existing code structures are written synchronously , When using asynchrony , There may be unfinished judgment of internal and external network environment , When the map initialization is not completed , The subsequent related code base has started to execute , Lead to many unknown undefined The problem of not getting objects like .

Finally, through customization Accessor class , Use watchUtils.whenTrue() Method , To solve the problem .

Reference post

ArcGIS JS Customize Accessor, And pass watchUtils Related methods watch attribute _ No overrun blog -CSDN Blog

Searched a lot of information , The front end did not find a suitable method to detect the internal and external networks . If there is a better solution , Welcome to share