filter()

filters data items in a component

filter(rule?: IFilterCallback | IFilterMode, config?: IFilterConfig): void;

Parameters:

• rule: function | object - the filtering criteria
• config: object - optional, defines the parameters of filtering

Example

grid.data.filter(function (item) {
    return item.a > 0 && item.b !== "Apple";
});

// or
grid.data.filter(function (item) {
    return item.a > 0 && item.b !== "Apple";
}, {
    add: true
});

// or
grid.data.filter({
    by: "a",
    match: "Orange",
    compare: function (value, match, item) {
        if (item.a !== "Some") {
            return val === "New";
        }
    return false;
    }
}, {
    add: true
});

Related sample: Data. Filter

Calling the filter() method without parameters reverts the component to the initial state:

grid.data.filter();

The rule parameter:

• if set as a function, the filtering will be applied by the rule specified in the function:

grid.data.filter(function (item) {
    return item.a > 0 && item.b !== "Apple";
});

• if set as an object, the parameter has the following attributes:

by	(string) mandatory, the id of a data field (the column of Grid)
match	(string) mandatory, a pattern to match
compare	(function) optional, a function for extended filtering that takes three parameters: value - the value to compare (e.g. a column in a row for Grid) match - a pattern to match item - a data item the values of which should be compared (e.g. a row)

For example:

grid.data.filter({
    by: "a",
    match: "Orange",
    compare: function (value, match, item) {
        if (item.a !== "Some") {
            return value === "New";
        }
    return false;
});

The config parameter may contain two properties:

add	(boolean) defines whether each next filtering will be applied to the already filtered data (true), or to the initial data (false, default)
smartFilter	(boolean) defines whether a filtering rule will be applied after adding and editing items of the collection

For instance:

grid.data.filter(function (item) {
    return item.a > 0 && item.b !== "Apple";
}, {
    add: true,
    smartFilter: true
});

grid.data.filter({
    by: "a",
    match: "Orange",
    compare: function (value, match, item) {
        if (item.a !== "Some") {
            return val === "New";
        }
    return false;
    }
}, {
    add: true,
    smartFilter: true
});