Cascading drop down in SharePoint using REST API

Cascading drop down or filtered Lookup Columns in SharePoint is one of the most used functionality in most of the projects for various business needs.

In one of my old articles, I have explained about creating cascading or filtered lookup columns using JQuery & SPServices in MOSS 2007 version of SharePoint. 

Cascading drop down (or) Filtered Values in Lookup Columns in SharePoint

This solution has limitations such as this will work only in List Forms and it may not work after certain limit of values in the drop down.

Previous articles reference 
CAML Query tutorial for SharePoint
Multi value Lookup Columns in SharePoint

In this article, we will learn to implement Cascading or Filtered Lookup Columns in latest versions of SharePoint using REST API (applicable to SharePoint 2013, Office 365 – SharePoint Online, SharePoint 2016). REST API uses OData (Open Data Protocol) services to read/write/update data in SharePoint.

I have created 2 lists with the following information as shown below:

1. Drinks 
2. Drinks Type (Drink column is a lookup column to display Title from Drinks List)             

             

Now create a list to test the cascading or filtered lookup functionality. I have created a list with “Drinks Menu” as the name. 

             

Please note, the Drinks and Drink Type columns are created as Choice type and all the values from Drinks and Drink Type are added as choices in these fields. This is implemented in this way so that we can avoid the issue surfaces when we have large number of options in Lookup Column. 

Also, if you add a new value to parent lists (Drink or Drink Type lists in this scenario), add the values as choice in the cascading lookup value implementation list ( Drink Menu list in this scenario).

Now, click on the new item which will open the “NewForm.aspx” -> Edit the page -> Add a Web Part -> Insert -> Categories -> Media and Content -> Script Editor -> Click Add to add it.

In the Script Editor, click Edit Snippet and add the CascadingDropdown.js (download from the below attachment). I have referred “JQuery.1.12.0.min.js” in the code which is also available for download. Make sure JQuery is referenced properly in your code else, the script won’t work.

Following are the scenarios, I have covered in this example:

When “Drinks” drop down is not selected or changed to empty, then “Drink Type” & “Price” fields should be disabled and empty

When “Drinks” is selected, “Drink Type” should cascade (filter the values) and show the types based upon selection

When “Drink Type” is selected, the “Price” should automatically populate in the Price field

The data saved to the list will look as shown below:

JS code for cascading the lookup values (Drinks -> Drink Type) is shown below:

//Function to filter the values of Drink Types
function loadDrinkTypes(selectedDrink) {
    var drinkTypeListName = "Drink Type";
    var drinkTypeListURL = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbytitle('" + drinkTypeListName + "')/items?$select=Title,Drink/Title,Drink/Id&$expand=Drink&$filter=Drink/Title eq '" + selectedDrink + "'";
    getReqData(drinkTypeListURL, function (data) {
        var items = data.d.results;
        if (items.length > 0) {
            var optionsAsString = '<option value=""></option>';
            for (var i = 0; i < items.length; i++) {
                optionsAsString += "<option value='" + items[i].Title + "'>" + items[i].Title + "</option>";
            }
            $('select[title="Drink Type"]').html(optionsAsString);
        }
    },
        function (data) {
            //alert("Some error occurred in getting Drink Types");
        });
}

//JQuery AJAX to access REST API JSON data
function getReqData(reqUrl, success, failure) {
    $.ajax({
        url: reqUrl,
        method: "GET",
        headers: { "Accept": "application/json; odata=verbose" },
        success: function (data) {
            success(data);
        },
        error: function (data) {
            failure(data);
        }
    });
}

JS code for setting the Price value automatically on Drink Type selection is shown below:

//Function set the Drink Price 
function setDrinkPrice(drinks, drinkType) {
    var drinkTypeListName = "Drink Type";
    var drinkTypeListURL = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbytitle('" + drinkTypeListName + "')/items?$select=Price&$filter=(Drink/Title eq '" + drinks + "') and (Title eq '" + drinkType + "')";
    getReqData(drinkTypeListURL, function (data) {
        var items = data.d.results;
        if (items.length > 0) {
            var price = "";
            for (var i = 0; i < items.length; i++) {
               $("input[title='Price']").val(items[i].Price);
            }
        }
    },
        function (data) {
            //alert("Some error occurred in getting price");
        });
}

Please download the full code to view how each method are called in document.ready()

Download the JS files, List Templates from this link for the complete solution.

Note:

1. The above code is tested in SharePoint Online (all the lists are in Classic Mode and not Modern List views in SP Online)

2. It should work in SharePoint 2013 and 2016 versions as well

Please free to comment. Always, your comments help me to write more.😃 Share this post to others if this helps you!😇

You’re still here? I don’t have anything else for you sorry. It’s straightforward. Go… go make some users happy. 😎😀
Update: 06/07/2017
To know about implementing multi-value lookup column and filtering values, read this article: Multi value Lookup Columns in SharePoint

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Accessing Checkbox in SharePoint using JQuery

I couldn't find anything obvious for accessing SharePoint Check Box so chucked this together, hopefully useful for someone else 😉😎

Read this article to know about Accessing Radio Buttons using J Query in SharePoint

Note: The below code/solution is applicable to accessing check box in a custom SharePoint List forms using SharePoint Designer. To know how to create a custom form in SharePoint Online, read this article Get Current Logged in User & Manager using REST API in SharePoint OnlineAccessing Check Box control in SharePoint is little tricky than accessing the check box in HTML. The reason being, Check Box control is rendered as a table instead of a single control as shown below (Check Box and its preview in developer tools - Chrome):

So, each check box is rendered inside SPAN tag in a table. To access the normal SharePoint controls, we will use either ID or title property but for Check Box it is little complicated.

The actual check box control is in "input" tag 2. The values (Example here: A, B) are inside "label" tag 3. But each control (Yes & No) are represented by ID which is generated by SharePoint 4. If you look at the ID, there is "ff5" which is the ID of the control generated randomly by SharePoint

Now, open the designer, add an ID to the TD of the Check Box so that we can query it easily using JSOM as shown below:

//Get the checked values of Check Box
$("input[id ^= 'tdLanguage']").is(function(){
    var checked = $(this).is(":checked"); //is checkbox checked (true/false)?
    var theVal = $(this).next().text();  //get the label for this checkbox
    alert(checked + " : " + theVal);
});

//Check if checkbox is selected or not
($("#tdLanguage").children().find('input:checkbox').is(':checked'))

//Check box checked or not - single check box type in SharePoint
$("td[id='tdLanguage'] input:checkbox[name*='ff5']").is(":checked")

//Check all the values of checkbox
$("td[id='tdLanguage'] input:checkbox[name*='ff5']").attr('checked',true )

//Uncheck /Clear all checkbox values
$("td[id='tdLanguage'] input:checkbox[name*='ff5']").attr('checked',false )

*** "'tdLanguage'" is the ID of the SharePoint Radio Button Control, "ff5" is the unique ID of the SharePoint Control in your List form. Change this ID according to your form to get the exact result.
Please share your valuable comments which will make me write more and also share this post using the below social buttons to others.
Happy Share(ing)Point! 👍

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SharePoint Online Software Boundaries and Limits

Size limit and Number of items that can be synced

1.     You can sync up to 20,000 items in your One Drive for Business library. This includes folders and files.

2.   You can sync up to 5,000 items in a SharePoint library. This includes folders and files. These are the libraries that you find on various SharePoint sites, such as team sites and community sites. This also includes syncing other people's One Drive personal sites that you may have access to. You can sync multiple SharePoint libraries.

3.     In any SharePoint library, you can sync files of up to 2 GB

Character limit for files and folders

1. In SharePoint Online, file names can have up to 256 characters
2. Folder names can have up to 250 characters
3. When you sync One Drive for Business with SharePoint Online, a folder named "forms" isn't supported at the root level for a list or library. This occurs because "forms" is a hidden default folder that's used to store templates and forms for the library.
4. Any file that’s currently open by an application (for example, an Excel .xlsx file) can't be synced by One Drive for Business.
5. To sync the file, close any application where the file is currently being used, and then sync the file.
6. The following characters in file names aren't supported when you sync One Drive for Business with SharePoint Online: (\, /, :, *, ?, “, <, >, |, #, %, ~)

SharePoint Online Site Collection

1. SharePoint Online Site collection package details below:

• Small Business: a single Team Site Collection
• Midsize Business plans: limits 20 Team Site Collections
• Enterprise, Education, and Government: limits to 10,000 Team Site Collections

2. In all options, just single Public Web Site Collection can be created, 1TB for My sites, 2000 site/sub site per site collection

Developer Limits

Only Sandbox Solutions are designed to allow SharePoint developer to customize/develop on Office365/SharePoint Online

• No access to file/folder. It means you cannot use IO API commands
• Only be deployed at a site collection level scope (not farm scope)
• No access to web.config
• PDF Documents cannot be opened in the browser
• Restrictions to access security
• Cannot overuse system resources

Storage

The following table describes the limits for SharePoint Online in Office 365 Business Essentials and Office 365 Business Premium:

Feature	Description
Storage per user (contributes to total storage base of tenant)	500 megabytes (MB) per subscribed user
Storage base per tenant	10 GB + 500 MB per subscribed user + additional storage purchased For example, if you have 10,000 users, the base storage allocation is approximately 5 TB (10 GB + 500 MB * 10,000 users) You can purchase an unlimited amount of additional storage
Site collection storage limit	Up to 1 TB per site collection. (25 GB for trial). SharePoint admins can set storage limits for site collections and sites. The minimum storage allocation per site collection is 100 MB
List view threshold limit in site libraries, including files and folders	You can sync up to 5,000 items in site libraries, including folders and files
Site collections (#) per tenant	500,000 site collections (other than personal sites)
Sub sites	Up to 2,000 sub sites per site collection
File upload limit	2 GB per file
Number of external user’s invitees	There is no limit to number of external users you can invite to your SharePoint Online Site Collections

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