Introductory examples

Detailed examples

Control types example

For reference, here’s an example of binding view model properties to a range of HTML control types. There’s nothing interesting about the view model here - this is just to make clear how bindings work with select elements, radio buttons, etc.

Live example

What's in the model?

Text value:
Password:
Bool value:
Selected option:
Multi-selected options:
Radio button selection:

HTML controls {html5 datetime etc}

Text value (updates on change):
Text value (updates on keystroke):
Text value (multi-line):
Password:
Checkbox:
Drop-down list:
Multi-select drop-down list:
Radio buttons:

Source code: View

            
<div class="readout">
    <h3>What's in the model?</h3>
    <table>
        <tr>
            <td class="label">Text value:</td>
            <td data-bind="text: stringValue"></td>
        </tr>
        <tr>
            <td class="label">Password:</td>
            <td data-bind="text: passwordValue"></td>
        </tr>
        <tr>
            <td class="label">Bool value:</td>
            <td data-bind='text: booleanValue() ? "True" : "False"'></td>
        </tr>
        <tr>
            <td class="label">Selected option:</td>
            <td data-bind="text: selectedOptionValue"></td>
        </tr>
        <tr>
            <td class="label">Multi-selected options:</td>
            <td data-bind="text: multipleSelectedOptionValues"></td>
        </tr>
        <tr>
            <td class="label">Radio button selection:</td>
            <td data-bind="text: radioSelectedOptionValue"></td>
        </tr>
    </table>
</div>

<h3>HTML controls</h3>
<table>
    <tr>
        <td class="label">Text value (updates on change):</td>
        <td><input data-bind="value: stringValue" /></td>
    </tr>
    <tr>
        <td class="label">Text value (updates on keystroke):</td>
        <td><input data-bind='value: stringValue, valueUpdate: "afterkeydown"' /></td>
    </tr>
    <tr>
        <td class="label">Text value (multi-line):</td>
        <td><textarea data-bind="value: stringValue"> </textarea></td>
    </tr>
    <tr>
        <td class="label">Password:</td>
        <td><input type="password" data-bind="value: passwordValue" /></td>
    </tr>
    <tr>
        <td class="label">Checkbox:</td>
        <td><input type="checkbox" data-bind="checked: booleanValue" /></td>
    </tr>
    <tr>
        <td class="label">Drop-down list:</td>
        <td><select data-bind="options: optionValues, value: selectedOptionValue"></select></td>
    </tr>
    <tr>
        <td class="label">Multi-select drop-down list:</td>
        <td><select multiple="multiple" data-bind="options: optionValues, selectedOptions: multipleSelectedOptionValues"></select></td>
    </tr>
    <tr>
        <td class="label">Radio buttons:</td>
        <td>
            <label><input type="radio" value="Alpha" data-bind="checked: radioSelectedOptionValue" />Alpha</label>
            <label><input type="radio" value="Beta" data-bind="checked: radioSelectedOptionValue" />Beta</label>
            <label><input type="radio" value="Gamma" data-bind="checked: radioSelectedOptionValue" />Gamma</label>
        </td>
    </tr>
</table>

Source code: View model

    var viewModel = {
        stringValue : ko.observable("Hello"),
        passwordValue : ko.observable("mypass"),
        booleanValue : ko.observable(true),
        optionValues : ["Alpha", "Beta", "Gamma"],
        selectedOptionValue : ko.observable("Gamma"),
        multipleSelectedOptionValues : ko.observable(["Alpha"]),
        radioSelectedOptionValue : ko.observable("Beta")
    };
    ko.applyBindings(viewModel);

Try it in jsFiddle