How to read userData in jqgrid?

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In general the usage of userData is pretty simple. jqGrid gives you support to send from the server any additional data which will be saved together with the jqGrid data. So if jqGrid parses the data returned from the server then it just looks for userdata (not for userData!!!) and save is in the internal parameter userData.

{ "total":25,
  "page":1
  "records":107,
  "userdata": {"foo": "bar"},
  "rows": [...] }

Be careful: the default property in the input data must be userdata and NOT userData like you currently have. You can overwrite the default name of input property jsonReader: {userdata: "userData"} or jsonReader: {userdata: "myData"} if you use userData or myData as the property name with your additional data.

One from the standard usage of userData is for displaying of the footer in the jqGrid. You can use the data for any your other propose. In another answer it is shown how to use userData to select the some row/rows directly after the loading data from the server.

If you use loadonce:true parameter, the usage of userData will be a little more tricky because after the first load the data from the parameter userData will be deleted, so you have to save there in the external object.

Of cause you can access the userData with respect of jQuery("#grid").getGridParam('userData') only after the data are loaded. So you should do this inside of loadComplete event handle or later. By the way inside of loadComplete event handle you can access to all data which are send to you from the server through data parameter of loadComplete event. So you can read any other additional data and save there somewhere.

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