CODEWITHSUNDEEP
htmlknockout.js
Stranger
Stranger

Reputation: 862

knockout dynamically adding a row in a table

Problem Description:

I am using knockout and I have a table. In this table, I have 3 columns. The first column has a drop down list. I want to generate a new row whenever a user chooses a value from a drop down list.

Here's my fiddle : http://jsfiddle.net/JPVUk/10/

<table class="table table-bordered">
<thead class="mbhead">
    <tr class="mbrow">
        <th>Type</th>
        <th>Comment</th>
        <th>Amount</th>
    </tr>
</thead>
<tbody>
    <tr>
        <td>
           <select class="input-small">
           <option value="">Type</option>
           <option value="">One</option>
           <option value="">Two</option>
           <option value="">Three</option>
           </select>
        </td>
        <td><input class="input-small"/></td>
        <td><input class="input-small"/></td>
    </tr>

</tbody>
  </table>
 <button id="saveButton">save</button>`

I want to accomplish this using knockout. Is there a way to accomplish it using knockout?

Upvotes: 3

Views: 5129

Answers (1)

Rune Vejen Petersen
Rune Vejen Petersen

Reputation: 3239

If I understand your question correctly, you want knockout to add a new row every time the selection in one of your dropdowns is changed.

You can do this by creating a view model with an observable array containing items. You then get your dropdown to insert items into it whenever the selection changes. See the following:

var ViewModel = function() {
    var self = this;
    self.items = ko.observableArray([{comment:'first comment', amount:0}]);
    self.addNewItem = function(){
        self.items.push(new Item('',0));
    };
}

var Item = function(comment, amount) {
    var self = this;
    self.comment = ko.observable(comment);
    self.amount = ko.observable(amount);   
}; 

vm = new ViewModel()
ko.applyBindings(vm);

If you then add the following to your table markup:

<tbody data-bind="foreach: items">
    <tr>
        <td>
           <select class="input-small" data-bind="event: { change: $root.addNewItem }">
               <option value="">Type</option>
               <option value="">One</option>
               <option value="">Two</option>
               <option value="">Three</option>
           </select>
        </td>
        <td><input class="input-small" data-bind="value: comment"/></td>
        <td><input class="input-small" data-bind="value: amount"/></td>
    </tr>
</tbody>

I updated your JsFiddle here

Upvotes: 5

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