How: Change the target Web Map in the JSON of a Web App?

[RVx_GaslineGiS]

I needed to make changes to the JSON of an existing web map that is part of a web app. Before replacing it, I want to test the JSON changes on a new web map.

The new web map is a near duplicate the replacement--including its data sources, published services, and the layer ID. The main difference is in the itemIDs it uses to reference several feature layers.

The Web App uses a lot of configured widgets including different Searches, Group Layers, and the eSearch widget. I don't want to have to re-do any of those. Is there an easy location within the Web App's JSON I can change to point to the new web map instead?

[LefterisKoumis · Accepted solution]

You can define the new web map id by changing it in the app config.json file. Look for the  itemId value found under the map object.

 "map": {

    "3D": false,

    "2D": true,

    "position": {

      "left": 0,

      "top": 40,

      "right": 0,

      "bottom": 0

    },

    "itemId": "<your map id>",

    "mapOptions": {

      "extent": {

        "xmin": -14304987.782245828,

        "ymin": 3965994.21067048,

        "xmax": -12185541.861955022,

        "ymax": 5115607.116079226,

        "spatialReference": {

          "wkid": 102100

        }

[RVx_GaslineGiS]

Thank you! I had been searching for where the map's itemID was but just couldn't locate it.

In retrospect, I suppose I could have used ctrl+f to and searched for the map's item id...