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Knockout.JS: Bind change event of select to another UI attribute


Knockout.JS: Bind change event of select to another UI attribute

By : Paul Onley
Date : November 22 2020, 02:59 PM
wish of those help Store your options in an array and bind them to the select input via the options binding. To store the selected value, use (your existing) database observable. Based on that observable, you can show your form fields when the database observable has an selected option (or hide them, if not).
also, use the optionsCaption binding to show a "please choose" option. otherwise, you need to manually deal with filtering that dummy option out.
code :
function viewModel(){
  this.databaseOptions = ko.observableArray(["MySQL database format", "PostgreSQL database format", "Other format"]);
  this.database = ko.observable();
}

ko.applyBindings(new viewModel());
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<select id="db" class="form-control" data-bind="options: databaseOptions, optionsCaption: ' -- select an option -- ', value: database">

</select>
<hr />
<div data-bind="if: database">
  <label>Address :</label>
  <input type="text" class="form-control" id="address" data-bind="visible: database">
  <label>Port :</label>
  <input type="text" class="form-control" id="port">
</div>


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How can I bind the selected text of a Select box to an object's attribute with Knockout JS, or anything else?

How can I bind the selected text of a Select box to an object's attribute with Knockout JS, or anything else?


By : user2661291
Date : March 29 2020, 07:55 AM
This might help you So yes, you got what I was getting at. Use the text as the value for the select options rather than using an index. The value really should be something useful, I can't think of any case where I've ever used an index. A number sure, but a number that relates to the application's models in some way (like an id from a database), not to the number of items in the select box.
Well done.
knockout.js data-bind 'with' conflicts with jQuery change event

knockout.js data-bind 'with' conflicts with jQuery change event


By : Gorurd
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The with binding is a wrapper to the template binding. It copies off the child elements and uses them as the template. So, if your detailedStudent is changing, then KO will be rendering new elements each time that did not have the event handler attached to it.
Some alternatives:
Knockout data-bind attribute added dynamically does not trigger the click event handler

Knockout data-bind attribute added dynamically does not trigger the click event handler


By : Matthew Dixie Ludwig
Date : March 29 2020, 07:55 AM
will be helpful for those in need If the element was added after ko.applyBindings was called, then Knockout would not have had a chance to bind it. If you are using the template binding (or with, foreach, etc.) to add dynamic content, then Knockout takes care of this for you. This is generally the best approach.
In your case, if possible, you could wait to call ko.applyBindings until the content has been added.
code :
ko.applyBindingsToNode(qaItemLink, { click: viewModel.showQaItemDetails }, optionalContext);
Knockout data-bind not updating on custom event from select binding

Knockout data-bind not updating on custom event from select binding


By : user2271160
Date : March 29 2020, 07:55 AM
Does that help Stupid mistake on my part, it would help if the data-bind object was an observable
code :
{
    dataItemId: -1,
    name: ko.observable(res.Text),
    dataType: ko.observable(res.DataType),
    dataTypeChange: function() {
        this.sliderType = (this.dataType._latestValue.id == 6) ? true : false;
    },
    sliderType: ko.observable(sliderActive)
}
knockout data-bind inputmask prevents change event

knockout data-bind inputmask prevents change event


By : Kevin Davis
Date : March 29 2020, 07:55 AM
should help you out I have a data-bind that looks like this , Try adding value: PayRate to your input markup as well
code :
<td><input type="text" data-bind="value: PayRate, inputmask: {value:PayRate}, event:{change: $root.payRateChanged}" /></td>
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