Tag: powerpointjs

I have been working hard on my OfficeJS.Dialogs library and just published version 1.0.5. You can get it from NPM and GitHub. See my previous post for more information on how to do this.

I have added a few new features:

• A simple Alert.Show() method that displays a simple OK box. For those times you want to just simply pop up a quick notification to the user.
• A Progress.Show() that displays a progress bar. This allows for you to show the progress bar and then issue Progress.Update() to move the progress bar along. When you are done you call Progress.Complete().
• A Wait.Show() dialog that will show an indeterminate spinner. This form will remain up until you issue a Wait.CloseDialog().
• New UpdateMessage() and Update() methods were added to the MessageBox. This was done to allow you to quickly ask a lot of questions of the user in one instance of the dialog, without giving the user back to the application for a second while the new dialog is rendered. UpdateMessage() will just update the message but keep all the buttons the same, but you will specify a new callback. Update() will allow you to fundamentally change all the settings the MessageBox (buttons, icon, caption, text and all), plus a new callback function.
• Behind the scenes I made some improvements/bug fixes:
  • If you try to show two dialogs too quickly, nothing will happen. So I added a half-second delay between dialog displays to make sure you never get an overlap.
  • You will get an error message in your callback if more than one dialog is attempted to be opened at once.
  • “Window Messaging” has been setup with Progress and MessageBox to allow the parent and the dialog to pass messages back and forth. It involves using setTimeout().

For those interested in the last item, here is what that look like:

[code lang=”javascript” collapse=”true” title=”click to expand if the embedding below is not visible.”]
/**
* Handles messages coming from the parent
*/
function startMessageHandler() {
setTimeout(function() {
var message = localStorage.getItem("dialogMessage");
localStorage.setItem("dialogMessage", ""); // clear the message
if(message !== undefined && message !== null && message != "")
{
var msg = JSON.parse(message);
if(msg.message == "update") {
// update the form
updateForm(msg.settings);
} else if(msg.message == "close") {
// do nothing special here
return; // stops the message pump
} else if(msg.message == "progress") {
if(msg.settings.Number > 100) return;
$("#bar").prop("value",msg.settings.Number);
}
}
startMessageHandler(); // call again
}, 0);
}
[/code]

Here is an example of how to use the Progress dialog. The method signature is like this:

Progress.Show( [message], [start], [max], [completeCallback], [cancelCallback] )

• The message is the message the user see’s when the dialog is opened.
• The start is the number you want the progress bar to start at. Usually this should just be zero (0).
• The max is the number you want the Progress bar to end at. Usually this should be 100. But it can be any number you want. If you have 5 steps to perform in the background while this dialog is up, you can set this to 5.
• The completeCallback is your callback function to be called when your code calls the Progress.Compelte().
• The cancelCallback is what gets called when the user presses the Cancel button on the form.

By itself, this will do nothing. You will have to call the Progress.Update() command in order to move the progress bar, or update the message to the user. Here is the method signature for the Update method:

Progress.Update( [amount], [message] )

• The amount is how much you want the progress bar to move. If you do not specify an amount, an amount of 1 is assumed.
• The message is a new message to provide the progress bar. If you want to update the message and do not want to increment the progress bar, specify an amount of zero (0).

Once you are all done with the Progress dialog, you issue a Progress.Complete() call. There are no parameters to it. Once called, your completeCallback in the Progress.Show() call will then be executed.

Here is an example:

[code lang=”javascript” collapse=”true” title=”click to expand if the embedding below is not visible.”]
// reset first to make sure we get a fresh object
Progress.Reset();
// display a progress bar form and set it from 0 to 100
Progress.Show("Please wait while this happens…", 0, 100, function() {
// once we are done – when your code
// calls Progress.Complete()
Alert.Show("All done folks!");
}, function() {
// this is only going to be called if the user cancels
Alert.Show("The user cancelled");
});
doProgress();

function doProgress() {
// increment by one, the result that comes back is
// two pieces of information: Cancelled and Value
var result = Progress.Update(1);
// if we are not cancelled and the value is not 100%
// we will keep going, but in your code you will
// likely just be incrementing and making sure
// at each stage that the user has not cancelled
if(!result.Cancelled && result.Value <= 100) { setTimeout(function() { // this is only for our example to // cause the progress bar to move doProgress(); },100); } else if(result.Value >= 100) {
Progress.Compelte(); // done
}
};
[/code]

That example also uses the new Alert dialog. This one is very simple:

Alert.Show ( [message] )

This next example uses the new Wait dialog, which is much simpler to implement. Here is the method signature:

Wait.Show( [message], [showCancel], [cancelCallback] )

• The message is the message you want to show the user. If you specify null, it will appear as simply “Please wait…”
• The showCancel flag if set will allow the user to see a Cancel button.
• The cancelCallback function is only valid if the showCancel option is true. When the user presses cancel, this function gets called.

When you are ready to close the Wait dialog, you issues a Wait.CloseDialog(). Here is an example:

[code lang=”javascript” collapse=”true” title=”click to expand if the embedding below is not visible.”]
Wait.Show(null, true, function() {
Alert.Show("The user cancelled.");
});
setTimeout(function(){
Wait.CloseDialog();
Alert.Show("Done!");
}, 15000);
[/code]

If you have some suggestions for some things you would like to see added to this library, please add a comment below or reach out to me on LinkedIn or Twitter. Some ideas I will be working on:

• Allow you to call another dialog type without having the close the dialog.
• A selection dialog, where you have a dropdown list of a listbox where you wan select (or multi-select) items.
• An option to resize forms.
• An option to use the message handler in your own custom form – minimal code