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Paging & Sorting grids with ASP.Net MVC
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Closed 9 years ago.
I am learning MVC. I'm creating a simple website for demo, which stores products in Database and shows them to the user 10 per page. Now, how do I fetch "NEXT" 10/20 items from the database? I thought of adding auto-increment column to table and then fetching items on its basis. Is it the right way? Also I am keeping record of how many items have been shown to the user by getting an int value as parameter to the Controller function, Products(int id). Is it the right way? I mean will it work if user is on 5th page(hence id==5) and refreshes the page?(or will it set id back to 0?).
you can use linq queries to fetch number of items in a table. you can pass number of item, start index. then the query will be like this
var nextProduct = myProducts.Skip(100).Take(10);
it will return 10 items from 101 to 110.
Fetching data based on id is not a good idea. because if u delete any record there will be a difference in the count and id. so you can take using the above code concept
Related
being a newbie to SSRS, I am trying to figure out the following:
say for instance I have a dataset which does a :
SELECT [cols...] from [some view]
I want to be able to further filter this based on parameters given from an ASP.NET site (I am using the AJAX control toolkit for the report viewer). There could be x amount of parameters and potentially can be filtered on 1 or more columns.
First question is, how would I filter the dataset and pass along the parameters along with which field the filter should apply to? I may have [col1] and I want to filter it with x values.
Second question Is, I want to be able to group the results per page based upon a column. So for each grouped result set, I want them to be displayed per page (per group per page).
Then on the headers of the page, I want it to display what the page grouping is. How would I do this?
In terms of what have I tried - nothing as I DO NOT KNOW HOW, it is why I am asking the question here to see what the experts (you) can suggest and guide me.
thank you!
To do this you can create Parameters in SSRS, they do not need to be in your query or anything. Then, go to your tablix and click either ROW or column depending on the filter type and set it show/hide visibility. For example I have a report that has personal information, so i have true/false parameter that hides/shows those columns, similar I have one that hides/shows any row with a -1 for the total paid.
I am using SQL Server. I have 2 columns Passed students and Failed Students in my database.
How to write a query which displays both these columns along with a third column which is Total Students which displays the sum of the entries in the row?
EDIT
It is not allowing me to ask another question.So,posting it here:
I have a hyperlink field in my gridview as below:
[Please refer comment for the code.For some reason it doesn't get posted here.]
Its basically a runId.When I click on this hyperlink I am redirected to a page called RunAnalysis.I want to access the value of the runId which was clicked in this page.
I was thinking of using query string but there is no event as far as I know that is fired on click of the hyperlink.
My question is how do I access the runId value in this page ? Can someone tell me if some event is fired so that I can send a query string.
Thanks.
You haven't given a lot of background information so I am assuming many things in my response.
Here is a simple aggregated result set:
SELECT SUM(Passed) AS [Passed],SUM(Failed) AS [Failed],COUNT(*) AS [TotalStudents]
FROM dbo.Students
Now if there is some grouping you want to do then you would add a GROUP BY clause like so...
I'm creating a new column because I don't know your schema:
SELECT GradeLevel, SUM(Passed) AS [Passed],SUM(Failed) AS [Failed],COUNT(*) AS [TotalStudents]
FROM dbo.Students
GROUP BY GradeLevel
ORDER BY GradeLevel
I have a form that submits parameters to a query, then opens the resulting record in another form. The problem is, whenever there is more than one record it automatically puts the first one into the from without any kind of option to choose the record I want. I have a macro set up on the search button on the first form that submits the parameters to the query and then displays it in the second form, I've tried to set up another macro in between the two, but I don't know if it's possible to set up the expression creator to check the number of rows resulting from a query. Is it possible to modify the query to create a prompt to choose which record I want? Or should I change something else?
This is the query:(automatically created by access)
SELECT CHILD.CHILD_L_NAME, CHILD.CHILD_F_NAME, CHILD.DOB, CHILD.GENDER, CHILD.DAYS_IN_CARE,
CHILD.HOURS_PER_DAY, CHILD.ENROLLMENT_DATE, CHILD.CHILD_ADDRESS, CHILD.CHILD_CITY,
CHILD.CHILD_ZIP, CHILD.CHILD_STATE, CHILD.CLASSROOM, CHILD.SNACK, CHILD.LAST_UPDATED, CHILD.CIN
FROM CHILD
WHERE (((CHILD.CHILD_L_NAME)=[Forms]![Search]![L_NAME]) AND
((CHILD.CHILD_F_NAME)=[Forms]![Search]![F_NAME])) OR
(((CHILD.CHILD_L_NAME)=[Forms]![Search]![L_NAME]) AND
((CHILD.DOB)=[Forms]![Search]![DOB])) OR
(((CHILD.DOB)=[Forms]![Search]![DOB])) OR
(((CHILD.CHILD_L_NAME)=[Forms]![Search]![L_NAME]));
If I understood well your problem and you use VBA it's quite easy to do.
You can create a reduced query based on the query you're creating with the button. This new query should include all and only the fields that allows you to discriminate beetwen the records to show in the 2nd form.
For instance it could include LastName, FirstName and classroom to select between children with same full name.
You can count the number of records of this 2nd query and if greater than 1 it means that you have more than one children to show.
So you can use this 2nd query to populate a combo-box or a listbox for selecting the record you really want to show.
When number of records is 1 you can simply skip the listbox population using an if statement on recordcount.
Next step is opening the form with the selected (or unique) record.
Bye
I am looking for the best way to store information that is entered within an Oracle ApEx app that is sectioned off like a wizard.
Basically there are a number of fields on the screen, i.e. text box, text area, select list, checkboxes as well as radiogroup buttons but are not attached to any particular database tables.
What I would like to do is basically have the user enter required answers say on one pane, which might have 5 items in total, i.e., 2 textfields, 1 radiogroup, 1 selectlist and 1 checkbox and when they press the "Next>" button before going to the next pane, store these answers into a ApEx Collection against a particular Id and perform the same process on the following pane of answers entered.
I am using Oracle ApEx 4.1.2. Basically want to store away values on the fly and reuse at a later stage.
As I mentioned in my last comment above, Plouf came through with the goods. I didn't require an ApEx Collection after all - regular items did the trick.
In a simple scenario there is a webpage with a datagrid containing 2 columns; first name and country. There's a filter set on the grid to filter out all Australians. There's a form on the same page to add new records and a user decides to add someone from Australia. This record does not meet the filter criteria so would not normally display. However, this might be confusing from the users perspective as they might not have confidence that the person has been successfully added or have forgotten that the filter will mean the new entry is not displayed.
What is the best way to handle this from a usability perspective?:
display the new entry but leave the list in a state inconsistent
with the filter criteria?
filter out the new entry but risk confusing the user?
provide feedback to the user that the record was successfully
added but may be filtered out of the list?
?
Three tools I use, Mingle, Jira, and Quicken, use this implementation very effectively; a slight modification to your number 3:
Provide feedback to the user that the record was successfully added, but won't be shown, and provide a link to the record using its record identifier (record number + title).