Develop Reference

combine two selections to query database

I have a div which represents a category of items ...when I hover over the div a drop list of countries shows, then when the user selects a country....the items of that category of that country should be queried and retrieved from the database ...
Each category has it's own div(with the image inside). The countries are a list in a div.
I check some answers like this one ...but none fits for my case
Combine two html selections with jquery
My query should contain 2 fields ...when hover on Category need to pick its name , and country.
Trying a "form" didn't fit for this. Maybe JQuery or even React could handle this I hope...I've no clue in either one :)
Or maybe there is another approach!
P.S: I'm using spring boot 5, thyme leaf 3, Java and MySQL for DB.

Multiple unique columns in sharepoint

I'm creating a new form in SharePoint with the following fields:
Name
Phone
Email
But, I need that every column in the list is unique, it can't be any row with the same information.
I have an idea how to do this with javascipt, but don't know how to access to do a query in sharepoint to see if there is the same information.
If someone could help me with any solution would be great.
Thanks

I need that every column in the list is unique,
Are you saying that only one row in the list can have a certain email address? If so, just set "Enforce unique values:" for that column to "Yes". (Repeat for each column.)

If you want a column value like Email to be unique you can use the "Enforce Unique values" from the columns settings like shown below.
However if you want multiple columns to be unique like a composite unique key you will have override the presaveaction in the page to do a check before inserting the record. you can get more details of the presave action in the below link.
https://sharepoint.stackexchange.com/questions/91854/what-is-the-difference-between-presaveaction-and-presaveitem-on-sharepoint-l
https://social.technet.microsoft.com/wiki/contents/articles/31330.sharepoint-using-presaveaction-function-on-custom-list-forms.aspx

Dynatable.js - generate select dropdown filter from values in table

I'm currently using dynatable.js to generate a searchable/sortable table from a JSON file. Sorting and searching is working so far. However, as far as I can tell/find, a select dropdown for filtering must have the options manually created in the HTML of the table. I need to instead generate the options for the filter from the specific column.
Example:
The Gender column should be filter able by male and female. This example is fine to add the options directly in HTML as they will be the only options to exist. However, the 'course' column will change over time as courses are added and removed and fed to the table via ajax. The filter options for the column should be generated by the available values in the column.
Is this possible with dynatable as a feature? If not (I can't find it anywhere), how can this select dropdown by generated from the array being used to populate the column.

Filter table data as your type

I have 3 columns in a table, as shown below:
I want to filter rows as type in the text box above them.
The text boxes itself, optionally, use http://harvesthq.github.io/chosen/ to show the list of possible values as you type long.
Is there are a jquery tool I can use to achieve this?
If not how can i do that using JavaScript?

Checkout datatables examples
http://datatables.net
http://datatables.net/release-datatables/extras/FixedColumns/col_filter.html

You can use String.match(regex) to do so.
Chosen seems reaaly nice, which features do you need more ?

sort div on the basis of multiple data in div

I am trying to implement best match functionality. Basically I am working on a assignment and I am not good at jQuery or JS. The functionality is like user will use search functionality to search property and the search result will be shown, there is a drop-down on top of searched results which have sorting options like sort by distance, by best match etc.. I already have implemented functionality of other sorting options, just best match is remaining. I am not getting how to approach this problem because for implementing best match I have to match all fields of each record displayed and sorting the results as per that. The main question is how to compare multiple fields of each record using jQuery.
Following is the format of displayed result:
<div class="container">
<div id="ptype">property type</div>
<div id="ttype">sale</div>
<div id="price">$20000</div>
<div id="distance">24 Miles</div>
</div>
There would be multiple divs for different properties. Now I want to sort these results as per best match comparing each given fields like price, distance etc..
Pleas guide me how to approach this problem.