How to databind nested tables with filters using knockout.js?
How to databind nested tables with filters using knockout.js?
1 answer
by
arnoldo.moen ,
7 months ago
@orpha
To data bind nested tables with filters using Knockout.js, you can use the following steps:
- Define your main view model that contains an observable array of objects, each representing a row in your main table. Each row object should also contain another observable array of objects, representing the nested rows in the nested table.
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function MainViewModel() {
var self = this;
self.rows = ko.observableArray([
{
name: "Row 1",
nestedRows: [{ name: "Nested Row 1" }, { name: "Nested Row 2" }]
},
{
name: "Row 2",
nestedRows: [{ name: "Nested Row 3" }, { name: "Nested Row 4" }]
}
]);
}
|
- Create your HTML markup for the main table and nested tables using the Knockout.js foreach binding to iterate over the rows and nested rows.
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<table>
<thead>
<tr>
<th>Main Table</th>
</tr>
</thead>
<tbody data-bind="foreach: rows">
<tr>
<td data-bind="text: name"></td>
</tr>
<tr>
<td>
<table>
<thead>
<tr>
<th>Nested Table</th>
</tr>
</thead>
<tbody data-bind="foreach: nestedRows">
<tr>
<td data-bind="text: name"></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
|
- Add filtering functionality to your view model by adding an observable property for the filter text and a computed property to filter the rows based on the filter text.
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function MainViewModel() {
var self = this;
self.rows = ko.observableArray([
{
name: "Row 1",
nestedRows: [{ name: "Nested Row 1" }, { name: "Nested Row 2" }]
},
{
name: "Row 2",
nestedRows: [{ name: "Nested Row 3" }, { name: "Nested Row 4" }]
}
]);
self.filterText = ko.observable("");
self.filteredRows = ko.computed(function() {
var filter = self.filterText().toLowerCase();
return ko.utils.arrayFilter(self.rows(), function(row) {
return row.name.toLowerCase().indexOf(filter) >= 0 ||
ko.utils.arrayFirst(row.nestedRows(), function(nestedRow) {
return nestedRow.name.toLowerCase().indexOf(filter) >= 0;
});
});
});
}
|
- Update your HTML markup to bind the filter input to the filterText property and use the filteredRows computed property instead of the rows observable array.
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<input type="text" data-bind="value: filterText, valueUpdate: 'input'">
<table>
<thead>
<tr>
<th>Main Table</th>
</tr>
</thead>
<tbody data-bind="foreach: filteredRows">
<tr>
<td data-bind="text: name"></td>
</tr>
<tr>
<td>
<table>
<thead>
<tr>
<th>Nested Table</th>
</tr>
</thead>
<tbody data-bind="foreach: nestedRows">
<tr>
<td data-bind="text: name"></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
|
By following these steps, you can databind nested tables with filters using Knockout.js in your web application.
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