You get jqGrid for free with full open soure code. It has many features and it tries to hold backwards compatibilite with previous old versions and still introduce new features. If you have problems with understanding of documentation you can examine the source code of it.

Additionally to documentation you can find many code examples on stackoverflow.

As you could read before you can set readonly attribute on input filed inside of beforeShowForm. In the code example which you posted you do this in the wrong way. You try to make

readonly ($(“#tr_id”,formid).attr('readonly','readonly');) instead of setting the attribute of element ($(“#id”,formid).attr('readonly','readonly');). The callback onInitializeForm will be called before the form is created. So usage of $(“#tr_rangefrom”,formid).show(); inside is wrong.

I answerd your question here. UPDATED part of the answer described why $(“#id_g”).val() is equal to “_empty” in Add dialog. The next picture clear it:

The bug is the usage of rowNum: -1. The documentation contains explicitly crossed out text about the usage of rowNum: -1. If you need display local data (inclusive the usage of loadonce: true) you have to use positive integer value for rowNum

Just for clearing of reason I wanted to add my comment here. The error of was because of not enough clear documention of the options of parameters of formatOptions of the formatter: “actions”. One can read in the documentation just the names of options. One can find editOptions, delOptions and many other options including the option url. One could misunderstand the option

See the answer, this one or this one