Unable to open JQuery dialog in TypeScript/Knockout

I'm currently working with knockout and typescript to trigger a dialog based on a certain condition. Although the if statement is functioning properly, I am facing an issue where the dialog does not toggle as expected using the code provided below. Any assistance on this matter would be highly valued.

Here is the TypeScript code snippet:

class SearchMTRModel {
    mtrWarnElement: JQuery;
    allowDuplicates : KnockoutObservable<boolean>;
 }
  • Initialize function :

    var model = new SearchMTRModel();
    
    $(() => {
    ko.applyBindings(model);
    search();
    
    model.mtrWarnElement = $('#mtrWarnDialog').dialog({
                autoOpen: false,
                modal: true,
                title: 'Duplicate MTR detected.',
                buttons: {
                    'Cancel': () => {
                        model.allowDuplicates = ko.observable(false);
                        model.mtrWarnElement.dialog('close');
    
                    },
                    'Confirm': () => {
                        var heats = new MTRHeat();
                        model.allowDuplicates = ko.observable(true);
                        addPDFToPackage(heats);
                        model.mtrWarnElement.dialog('close');
                    }
                },
            close: () => {
                model.allowDuplicates(false);
                model.allowDuplicates = ko.observable(false);
                model.mtrWarnElement.dialog('close');
                }
        });
    });
    

The section of code responsible for opening the dialog box:

export function addPDFToPackage(heat: MTRHeat): void {


    var koHeat: MTRHeatWithInclude = ko.mapping.fromJS(heat);
    koHeat.Include = ko.observable(true);

    var mtrID = koHeat.MTR.MTRID();

    var mtrIDs = [];

    var addToHeats = () => model.mtrPackage.Heats.push(koHeat);

    var arrayOfHeats = model.mtrPackage.Heats();
    for (var i = 0; i < arrayOfHeats.length; i++) {
        mtrIDs.push(arrayOfHeats[i].MTRID());
    }
    var idx = mtrIDs.indexOf(mtrID);

    if (idx >= 0) {

       //the code gets here but dialog doesn't open.

       model.mtrWarnElement.dialog('open');
    } 
    else if (idx === -1 || model.allowDuplicates()) {
       addHeatToPackage(model.mtrPackage.PackageID(), heat.HeatID).done(addToHeats);
        } 
    }
}

HTML Code:

<div id="mtrWarnDialog" data-bind="dialog: { autoOpen: false, modal: true}">

</div>

Answer №1

The code provided is somewhat unclear, as the jQuery dialog seems to be triggered by a confirm button rather than opening directly. Additionally, a dialog-BindingHandler mentioned in the HTML code is missing from the listing.


In my previous experience, I have successfully implemented the following approach:

Firstly, add a property to your component's ViewModel that determines whether the dialog should be displayed or not.

public displayDialog: KnockoutObservable<boolean> = ko.observable(false);

Create a custom BindingHandler for the jQuery Modal-dialog. There are numerous examples available on stackoverflow to guide you through this process. Remember to properly register the BindingHandler to ensure its functionality.

ko.bindingHandlers.modal = ...

In your HTML template, connect the public property from your ViewModel to the BindingHandler like so:

<div data-bind="dialog: { dialogVisible: displayDialog }"></div>

Finally, update the property on the ViewModel with true/false to open/close the modal window accordingly.

this.displayDialog(true);

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