Service Portal - how to save session info in storage (like using sessionStorage.setItem and getItem)

[Renee-17]

I'm new to ServiceNow and Angular.  

I need to be able to store some session values into a variable so that upon reload of the page those values are available. 

Basically, I have a table where I am using dir-paginate.  The customer has the option to select the count for ItemsPerPage.  The list displayed in the table has a checkbox, then when checked, updates the specific record and reloads the page.  

The window.location.reload() works fine with the exception that I need to go back to the current paginated page, with the correct pagesize they selected earlier.  So I need to store these values somewhere so that upon reload the itemsPerPage and current-page information is available.

I have a similar scenario that works where I pass the data between Service Portal Pages using $sp.getParameter and $location.search and it works, but in this scenario I get to pass the values between pages.  How do I perserve these values on window.location.reload();

If you have any idea how to do this, besure to tell me what is in the template vs client script vs server script.

Thanks!

[ahefaz1]

@Renee-17 ,

I think you should be able to use the servicenow session API.

Please check this documentation - https://developer.servicenow.com/dev.do#!/reference/api/utah/server/c_GlideSessionScopedAPI

Please accept solution OR mark helpful.

Thanks,

[Rajdeep Ganguly · Accepted solution]

In ServiceNow, you can use the GlideSession API to store session values. However, AngularJS does not have direct access to the server-side GlideSession API. You can use a GlideAjax call to interact with server-side scripts from the client-side AngularJS code.

Here's a general approach to solve your problem:

1. **Client Script (AngularJS):**
- Create a function to call a server-side script via GlideAjax.
- Pass the current page number and items per page as parameters to the server-side script.

2. **Server Script:**
- Create a Script Include that will be called by the GlideAjax from the client script.
- In this Script Include, use the GlideSession API to store the passed parameters as session values.

3. **Client Script (AngularJS):**
- After the page reloads, call another GlideAjax to retrieve the stored session values.
- Use these values to set the current page number and items per page.

Here's a sample code:

**Client Script (AngularJS):**

javascript
// Function to store session values
$scope.storeSessionValues = function(currentPage, itemsPerPage) {
var ga = new GlideAjax('SessionValues');
ga.addParam('sysparm_name', 'storeValues');
ga.addParam('sysparm_currentPage', currentPage);
ga.addParam('sysparm_itemsPerPage', itemsPerPage);
ga.getXML();
}

// Function to retrieve session values
$scope.getSessionValues = function() {
var ga = new GlideAjax('SessionValues');
ga.addParam('sysparm_name', 'getValues');
ga.getXMLAnswer(function(answer) {
var result = JSON.parse(answer);
$scope.currentPage = result.currentPage;
$scope.itemsPerPage = result.itemsPerPage;
});
}

**Server Script (Script Include):**

javascript
var SessionValues = Class.create();
SessionValues.prototype = Object.extendsObject(AbstractAjaxProcessor, {
storeValues: function() {
var currentPage = this.getParameter('sysparm_currentPage');
var itemsPerPage = this.getParameter('sysparm_itemsPerPage');
gs.getSession().putClientData('currentPage', currentPage);
gs.getSession().putClientData('itemsPerPage', itemsPerPage);
},

getValues: function() {
var currentPage = gs.getSession().getClientData('currentPage');
var itemsPerPage = gs.getSession().getClientData('itemsPerPage');
var result = {
currentPage: currentPage,
itemsPerPage: itemsPerPage
};
return JSON.stringify(result);
},

type: 'SessionValues'
});

Remember to call $scope.storeSessionValues() before reloading the page and $scope.getSessionValues() after the page reloads.

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[Renee-17]

Thanks! You're detailed response was very helpful.