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filtering a collection in jQuery expression


filtering a collection in jQuery expression

By : Leonie
Date : November 17 2020, 11:55 AM
this one helps. this return !!$(this).val().length; will filter out or give every element that doest have value attribute set. of course which means value length will be zero a false when checked with !!
code :


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Backbone Collection - Filtering and Rendering the Collection loses reference to the original unfiltered Collection

Backbone Collection - Filtering and Rendering the Collection loses reference to the original unfiltered Collection


By : Erik H
Date : March 29 2020, 07:55 AM
help you fix your problem I'm setting up an app driven by Backbone. I'm facing a "should-be-simple" problem, where I have a Model called "Message", a Collection called "MessageList", and Views called "MessageView" and "MessageListView". , When you call
code :
this.collection.reset(filtered)
Does jQuery.each evaluate the collection expression in every iteration?

Does jQuery.each evaluate the collection expression in every iteration?


By : davidworn
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The arguments of a function call are always evaluated before the function is called. This isn't jQuery specific. See the specification:
code :
for(var i = 0; i < $.parseJSON(data).content.length; i++) {

}
Filtering a collection based on filtering rules

Filtering a collection based on filtering rules


By : Josh
Date : March 29 2020, 07:55 AM
it helps some times You need the extension of Linq - http://www.albahari.com/nutshell/predicatebuilder.aspx This class provides PredicateBuilder which can create queries on the fly.
code :
using System;
using System.Linq;
using System.Linq.Expressions;
using System.Collections.Generic;

public static class PredicateBuilder
{
  public static Expression<Func<T, bool>> True<T> ()  { return f => true;  }
  public static Expression<Func<T, bool>> False<T> () { return f => false; }

  public static Expression<Func<T, bool>> Or<T> (this Expression<Func<T, bool>> expr1,
                                                      Expression<Func<T, bool>> expr2)
  {
    var invokedExpr = Expression.Invoke (expr2, expr1.Parameters.Cast<Expression> ());
    return Expression.Lambda<Func<T, bool>>
          (Expression.OrElse (expr1.Body, invokedExpr), expr1.Parameters);
  }

  public static Expression<Func<T, bool>> And<T> (this Expression<Func<T, bool>> expr1,
                                                       Expression<Func<T, bool>> expr2)
  {
    var invokedExpr = Expression.Invoke (expr2, expr1.Parameters.Cast<Expression> ());
    return Expression.Lambda<Func<T, bool>>
          (Expression.AndAlso (expr1.Body, invokedExpr), expr1.Parameters);
  }
}
  var predicate = PredicateBuilder.False<Entity>();

    if(ClickedAdded)
       predicate = predicate.Or(x=>x.Status == "Added");
    if(ClickedDeleted)
       predicate = predicate.Or(x=>x.Status == "Deleted");
    if(ClickedModified)
       predicate = predicate.Or(x=>x.Status == "Modified");

    return masterEntities.AsQueryable().Where(predicate);
Filtering lambda expression that compares two elements of the same collection

Filtering lambda expression that compares two elements of the same collection


By : Mairaj Hashmi
Date : March 29 2020, 07:55 AM
this will help What we can create is a Pairwise method that can map a sequence of values into a sequence of pairs representing each value and the value that comes before it.
code :
public static IEnumerable<Tuple<T, T>> Pairwise<T>(this IEnumerable<T> source)
{
    using (var iterator = source.GetEnumerator())
    {
        if (!iterator.MoveNext())
            yield break;

        T prev = iterator.Current;

        while (iterator.MoveNext())
        {
            yield return Tuple.Create(prev, iterator.Current);
            prev = iterator.Current;
        }
    }
}
var item = data.Pairwise()
    .First(pair => pair.Item1 <= v && pair.Item2 >= v)
    .Item1;
How to create Specification with filtering expression when working with field represents collection of objects?

How to create Specification with filtering expression when working with field represents collection of objects?


By : user3175776
Date : March 29 2020, 07:55 AM
Hope this helps if (attachmentFilteringName != null) { result = result.and((root, query, cb) -> cb.equal(root.join("attachments").get("attachmentName"), attachmentFilteringName)); }
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