Knockout: Change css class based on value of observable
Solution 1
You cannot pass value into computed in such way. It is better to add this computed to Notification
view model and use self.availability
property:
function Notification(root, sip, availability, note) {
var self = this;
self.sip = ko.observable(sip);
self.availability = ko.observable(availability);
self.note = ko.observable(note);
self.availabilityCssClass = ko.computed(function() {
var availability = self.availability();
if (["Busy", "DoNotDisturb", "BeRightBack"].indexOf(availability) != -1) return "leftStatusCellColorOrange";
else if (["Away", "Offline"].indexOf(availability) != -1) return "leftStatusCellColorRed";
else return "leftStatusCellColorGreen";
});
};
Your if
statement wasn't correct, so I fixed the logic. Here is working fiddle: http://jsfiddle.net/vyshniakov/Jk7Fd/
Solution 2
You just need to make availabilityCssClass
a function. As you've written it, it's not a computed observable since it has no observable dependencies.
self.availabilityCssClass = function (value) {
var availability = value;
if (availability === "Busy" || "DoNotDisturb" || "BeRightBack")
return "leftStatusCellColorOrange";
else if (availability === "Away" || "Offline")
return "leftStatusCellColorRed";
else
return "leftStatusCellColorGreen";
};
mupersan82
Updated on June 22, 2022Comments
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mupersan82 about 2 years
I use foreach on an observable array:
<div id="mainRight" data-bind="foreach: notifications"> <div class="statusRow"> <div class="leftStatusCell"> <div class="leftStatusCellColor" data-bind="css: availabilityCssClass($data.availability)"></div> </div> <div class="topRightStatusCell" data-bind="text: sip"></div> <div class="bottomtRightStatusCell ellipsisSingleline" data-bind="text: note"></div> </div> </div> <!== end mainRight ==>
As you can see, I pass the current value of availability to the function availabilityCssClass, which compares the value to some predefined strings. Depending on the matching string, it returns a class name.
self.availabilityCssClass = ko.computed(function (value) { var availability = value; if (availability === "Busy" || "DoNotDisturb" || "BeRightBack") return "leftStatusCellColorOrange"; else if (availability === "Away" || "Offline") return "leftStatusCellColorRed"; else return "leftStatusCellColorGreen"; });
This is my model. The data comes from an external data source.
function Notification(root, sip, availability, note) { var self = this; self.sip = ko.observable(sip); self.availability = ko.observable(availability); self.note = ko.observable(note); }; self.notifications = ko.observableArray();
However, it doesnt work as is. When the computed function is not commented out, the foreach does not iterate over the data and the div is empty. But I can see that the viewModel is not empty.