How the blocks work The when Screen1. If a list has three items, the indexes 1, 2, and 3 are valid. When the NextButton is clicked, the app doesn't choose the first item in the list, or the 2nd or 3rd, it chooses the currentQuestionIndex -th item. Now, you'll create a third list, PictureListwith the names of the image files as its items. The problem with the app is that it always increments the currentQuestionIndex variable when the NextButton is clicked. Though it's fairly innocuous, such user interface issues will definitely be noticed by the users of your app. When the NextButton is clicked for the first time, the increment blocks will set currentQuestionIndex from 1 to 2, so the app will select the second item from QuestionList"who pitched the first perfect game of ? To modify when NextButton. The list of answers will need to be a list of lists, with each sub-list holding the answer choices. This tutorial assumes you are familiar with the basics of App Inventor -- using the Component Designer to build a user interface, and using the Blocks Editor to specify event-handlers.
Another is to provide multiple answers for each question, and check by iterating ( using for each) through them to see if any match. Transform the quiz so that it is.
Contains a text string.
This string can contain any characters (letters, numbers, or other special characters). On App Inventor it will be considered a Text object. Jul 21, AppInventor with FusionTable (login process) If the password matches the username, congratulations, if not use a Notifier to tell the user to try.
If no inputs, returns an empty string.
Skip to main content. Text to blocks are executed under all conditions. Be sure that the names are exactly the same as the names of the files that were loaded in to the media of the project.
Next, create the following components by dragging them from the Palette into the Viewer and et the properties of the components as described below:. Here's how the blocks for the PictureList should look:. If you'd like to work with this sample in App Inventor, download the source code to your computer, then open App Inventor, go to the My Projects page, and choose Project Import project.
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|When you finish, it should look something like the snapshot below there are also more detailed instructions below the snapshot.
Test with both a correct and incorrect answer because text is being compared, the test is case-sensitive. Click event-handler you'll replace the previous test that referred directly to 3.
Text to blocks are executed under all conditions. Such dependencies in a computer program often lead to bugs, especially as an app grows in complexity.
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Then do the same for the other three images. The app must compare the user's entry with the answer to the "current" question, using an if then block to check.
. This block set checks to see if the text in the "PasswordTextBox" matches the set. Go to and login with your Marist Google account. Window and rename Sound1 to match the name of the sound we assigned.
Text Blocks string join length is empty?
Note that, because the blocks no longer refer to 3 or any specific size, the behavior will work no matter how many items are in the list. If it does, currentQuestionIndex is set back to 0 so that when 1 is added to it with the blocks below, it will be 1 and the quiz will loop back to display the first question.
So if currentQuestionIndex has a 4 in it, and the length of the QuestionList is 4, then the currentQuestionIndex will be set to 0 and then 1 after the increment operation in the first row of blocks after the if. Returns a new text string obtained by replacing all occurrences of the substring with the replacement.
Shival Wolf already provided a nice App Inventor Classic - MySQL interface. Set the SQLKEY in your app and in the PHP code, they must match for this code.
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You can check the entered text length easily, but you can't check for the entered case directly in app inventor. Instead, what about just converting the input to the.
You'll need the following blocks: Splitting appleberry,banana,cherry,dogfood with at as the two-element list whose first item is a comma and whose second item is rry returns a list of four items: Evaluating Answers Next, you'll add blocks that report whether the user has answered a question correctly or not.
Here's how the blocks for the PictureList should look: Clickyou'll need the following blocks:. When the NextButton is clicked, the user is moving on to the next question, so the top two rows of the event-handler blank out the RightWrongLabel and the AnswerText.
The list of answers will need to be a list of lists, with each sub-list holding the answer choices.
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|In this case, the app needs to remember the current question number -- the index into the list QuestionList.
First, you'll define two list variables, QuestionList to hold the list of questions, and AnswerList to hold the list of corresponding answers. When currentQuestionIndex is already 3 and the user clicks the NextButtonthe app changes currentQuestionIndex from 3 to 4, then calls select list item to get the currentQuestionIndex -thor in this case, the 4th item.
She loves coding as the text, She as the segment, and Hannah as the replacement would result in Hannah loves eating. With sound, you can turn your quiz app into a Name That Tune app. On the Viewer, move the button into HorizontalArrangment2. So if currentQuestionIndex has a 4 in it, and the length of the QuestionList is 4, then the currentQuestionIndex will be set to 0 and then 1 after the increment operation in the first row of blocks after the if.