Web Front-end
JS Tutorial
Creating a Visualization App Using the Google Charts API and AngularJS – Pt 3
Creating a Visualization App Using the Google Charts API and AngularJS – Pt 3
Feb 22, 2025 am 08:33 AM
This tutorial demonstrates how to build a data visualization application using the Google Charts API and AngularJS, focusing on two-way data binding. Previous parts covered controllers and directives; this part explores how to dynamically change chart types via a dropdown menu.
Key Features:
- A dropdown menu lets users select chart types (PieChart, BarChart, ScatterChart, LineChart).
- AngularJS's two-way data binding automatically updates the chart's view when the model (selected chart type) changes.
-
ngOptionsandngModelefficiently bind the dropdown options and selected value. -
ngChangeand$scope.$watchdynamically rerender the chart based on user selection.
Implementing the Dropdown and Data Binding:
The dropdown is added to index.html as a <select></select> element. Instead of hardcoding options, we define chart types in controllers.js using an AngularJS approach:
$scope.chartTypes = [
{typeName: 'PieChart', typeValue: '1'},
{typeName: 'BarChart', typeValue: '2'},
{typeName: 'ColumnChart', typeValue: '3'},
{typeName: 'LineChart', typeValue: '4'}
];
$scope.chartType = $scope.chartTypes[0];
The index.html <select> element uses ng-options and ng-model for data binding:
<select id="chartType" ng-model="chartType" ng-options="c.typeName for c in chartTypes"></select>
The ng-controller directive in index.html should be attached to the body element for proper functionality.
Dynamic Chart Updates:
The selectType function in controllers.js updates the chart type based on the dropdown selection:
$scope.selectType = function(type) {
$scope.chart.type = type.typeValue;
};
The gChart directive in directives.js uses $scope.$watch to monitor changes in $scope.chart and redraw the chart accordingly:
link: function($scope, elm, attrs) {
$scope.$watch('chart', function() {
var type = $scope.chart.type;
var chart = '';
// Conditional chart creation based on type
if (type == '1') { chart = new google.visualization.LineChart(elm[0]); }
else if (type == '2') { chart = new google.visualization.BarChart(elm[0]); }
else if (type == '3') { chart = new google.visualization.ColumnChart(elm[0]); }
else if (type == '4') { chart = new google.visualization.PieChart(elm[0]); }
chart.draw($scope.chart.data, $scope.chart.options);
}, true);
}
Remember to start the node server (node scripts/web-server.js) and navigate to http://localhost:8000/app/index.html to see the application. The complete code is available on GitHub (link not provided, as it was not in the input).
Frequently Asked Questions (FAQs): (The FAQs section from the input has been omitted here to keep the response concise. The provided information sufficiently addresses the core functionality of the tutorial.)
The above is the detailed content of Creating a Visualization App Using the Google Charts API and AngularJS – Pt 3. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java vs. JavaScript: Clearing Up the Confusion
Jun 20, 2025 am 12:27 AM
Java and JavaScript are different programming languages, each suitable for different application scenarios. Java is used for large enterprise and mobile application development, while JavaScript is mainly used for web page development.
Javascript Comments: short explanation
Jun 19, 2025 am 12:40 AM
JavaScriptcommentsareessentialformaintaining,reading,andguidingcodeexecution.1)Single-linecommentsareusedforquickexplanations.2)Multi-linecommentsexplaincomplexlogicorprovidedetaileddocumentation.3)Inlinecommentsclarifyspecificpartsofcode.Bestpractic
How to work with dates and times in js?
Jul 01, 2025 am 01:27 AM
The following points should be noted when processing dates and time in JavaScript: 1. There are many ways to create Date objects. It is recommended to use ISO format strings to ensure compatibility; 2. Get and set time information can be obtained and set methods, and note that the month starts from 0; 3. Manually formatting dates requires strings, and third-party libraries can also be used; 4. It is recommended to use libraries that support time zones, such as Luxon. Mastering these key points can effectively avoid common mistakes.
Why should you place tags at the bottom of the ?
Jul 02, 2025 am 01:22 AM
PlacingtagsatthebottomofablogpostorwebpageservespracticalpurposesforSEO,userexperience,anddesign.1.IthelpswithSEObyallowingsearchenginestoaccesskeyword-relevanttagswithoutclutteringthemaincontent.2.Itimprovesuserexperiencebykeepingthefocusonthearticl
JavaScript vs. Java: A Comprehensive Comparison for Developers
Jun 20, 2025 am 12:21 AM
JavaScriptispreferredforwebdevelopment,whileJavaisbetterforlarge-scalebackendsystemsandAndroidapps.1)JavaScriptexcelsincreatinginteractivewebexperienceswithitsdynamicnatureandDOMmanipulation.2)Javaoffersstrongtypingandobject-orientedfeatures,idealfor
What is event bubbling and capturing in the DOM?
Jul 02, 2025 am 01:19 AM
Event capture and bubble are two stages of event propagation in DOM. Capture is from the top layer to the target element, and bubble is from the target element to the top layer. 1. Event capture is implemented by setting the useCapture parameter of addEventListener to true; 2. Event bubble is the default behavior, useCapture is set to false or omitted; 3. Event propagation can be used to prevent event propagation; 4. Event bubbling supports event delegation to improve dynamic content processing efficiency; 5. Capture can be used to intercept events in advance, such as logging or error processing. Understanding these two phases helps to accurately control the timing and how JavaScript responds to user operations.
JavaScript: Exploring Data Types for Efficient Coding
Jun 20, 2025 am 12:46 AM
JavaScripthassevenfundamentaldatatypes:number,string,boolean,undefined,null,object,andsymbol.1)Numbersuseadouble-precisionformat,usefulforwidevaluerangesbutbecautiouswithfloating-pointarithmetic.2)Stringsareimmutable,useefficientconcatenationmethodsf
How can you reduce the payload size of a JavaScript application?
Jun 26, 2025 am 12:54 AM
If JavaScript applications load slowly and have poor performance, the problem is that the payload is too large. Solutions include: 1. Use code splitting (CodeSplitting), split the large bundle into multiple small files through React.lazy() or build tools, and load it as needed to reduce the first download; 2. Remove unused code (TreeShaking), use the ES6 module mechanism to clear "dead code" to ensure that the introduced libraries support this feature; 3. Compress and merge resource files, enable Gzip/Brotli and Terser to compress JS, reasonably merge files and optimize static resources; 4. Replace heavy-duty dependencies and choose lightweight libraries such as day.js and fetch
