This chapter discusses enhancing and validating forms with JavaScript. It covers customizing browser-based validation, implementing custom validation functions to check for errors, and displaying error messages. Some key points covered include validating required fields, dependent fields, and content type with custom functions. It also discusses improving form usability with techniques like removing default selections and dynamically updating fields based on user inputs.
Calypso is a new toolset for Pharo. It includes system browser and method browser.
Calypso is based on new navigation model which is suitable for browsing remote images
Generally speaking, a function is a "subprogram" that can be called by code external (or internal in the case of recursion) to the function. Like the program itself, a function is composed of a sequence of statements called the function body. Values can be passed to a function, and the function will return a value.
In JavaScript, functions are first-class objects, because they can have properties and methods just like any other object. What distinguishes them from other objects is that functions can be called. In brief, they are Function objects.
What is RDBMS?
RDBMS stands for Relational Database Management System. RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.
A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd.
This PPT explains SSIS Data flow task transformations that exists in SQL Server 2008 R2, it's the continuation of "http://www.slideshare.net/PramodSingla1/6-19-ssis-training2008r2-dataflowtransformation" PPT.
CyberLab Training Division :
ASP.NET is a web application framework developed and marketed by Microsoft to allow programmers to build dynamic web sites. It allows you to use a full featured programming language such as C# or VB.NET to build web applications easily.
This tutorial covers all the basic elements of ASP.NET that a beginner would require to get started.
Audience
This tutorial has been prepared for the beginners to help them understand basic ASP.NET programming. After completing this tutorial you will find yourself at a moderate level of expertise in ASP.NET programming from where you can take yourself to next levels.
Prerequisites
Before proceeding with this tutorial, you should have a basic understanding of .NET programming language. As we are going to develop web-based applications using ASP.NET web application framework, it will be good if you have an understanding of other web technologies such as HTML, CSS, AJAX. etc
ASP.NET supports three different development models:
Web Pages, MVC (Model View Controller), and Web Forms.
For More Details.
Visit: http://www.cyberlabzone.com
Calypso is a new toolset for Pharo. It includes system browser and method browser.
Calypso is based on new navigation model which is suitable for browsing remote images
Generally speaking, a function is a "subprogram" that can be called by code external (or internal in the case of recursion) to the function. Like the program itself, a function is composed of a sequence of statements called the function body. Values can be passed to a function, and the function will return a value.
In JavaScript, functions are first-class objects, because they can have properties and methods just like any other object. What distinguishes them from other objects is that functions can be called. In brief, they are Function objects.
What is RDBMS?
RDBMS stands for Relational Database Management System. RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.
A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd.
This PPT explains SSIS Data flow task transformations that exists in SQL Server 2008 R2, it's the continuation of "http://www.slideshare.net/PramodSingla1/6-19-ssis-training2008r2-dataflowtransformation" PPT.
CyberLab Training Division :
ASP.NET is a web application framework developed and marketed by Microsoft to allow programmers to build dynamic web sites. It allows you to use a full featured programming language such as C# or VB.NET to build web applications easily.
This tutorial covers all the basic elements of ASP.NET that a beginner would require to get started.
Audience
This tutorial has been prepared for the beginners to help them understand basic ASP.NET programming. After completing this tutorial you will find yourself at a moderate level of expertise in ASP.NET programming from where you can take yourself to next levels.
Prerequisites
Before proceeding with this tutorial, you should have a basic understanding of .NET programming language. As we are going to develop web-based applications using ASP.NET web application framework, it will be good if you have an understanding of other web technologies such as HTML, CSS, AJAX. etc
ASP.NET supports three different development models:
Web Pages, MVC (Model View Controller), and Web Forms.
For More Details.
Visit: http://www.cyberlabzone.com
This presentation introduces application developers to the use of XPages in IBM Lotus
Notes and Domino applications for the Web. It is accompanied by a series of exercises. For more information, see http://www-10.lotus.com/ldd/ddwiki.nsf/dx/Tutorial-intro-to-XPages.htm
How to Build Dynamic Forms in Angular Directive with a BackendBackand Cohen
In this blog we will demonstrate how to build dynamic forms in Angular with a backend, that in the end will return the configuration and data. This code was created for anyone who needs to build a complex project with many forms. To demonstrate the server side we will use Backand’s REST API in addition to referencing the full code in GitHub.
Explains how TachVault's real-time options pricing services can be access through Web/Mobile or RESTful enabled clients such as Excel/VBA applications.
Presents how TachVault's fair value options prices can be instantly accessed from Web/Mobile devices or from Excel/VBA financial applications as shown in http://www.tachvault.com/downloadFilesAction.php?fileName=Option-Pricing.xlsm.
Axios Systems assyst RUG2017 - Personalisation of assyst v2.0Axios Systems
Axios Systems annual UK assyst Regional User Groups in April 2017. We demonstrated assyst v10 enhancements to improve customer experience with better self-service navigation, CHAT, SmartMail and much more.
At Yahoo, our Salesforce developers are thinking 'above and beyond' to create innovative solutions with Apex and Visualforce. Join us as we discuss patterns for deep clone, mass and bulk edit, and walk through the data import wizard we built to allow our sales team to synchronously modify 10,000 records at a time.
In this quality assurance training session, you will learn QTP/UFT automation testing. Topics covered in this course are:
• Introduction to QTP
• Features of QTP
• Recording modes of QTP
• Object Repository
• Synchronization point
• Step Generator
• Object Spy
• Checkpoints
• Data-driven testing & Parameterization
• Working with actions
• Reporting in QTP
TO know more, visit this link: https://www.mindsmapped.com/courses/quality-assurance/get-practical-training-on-software-testing-quality-assurance-qa/
With OpenCms 9.5, the SOLR collector has been introduced as the best method to get a specified list of resources out of the VFS. This collector allows the developer to formulate a SOLR query as collector parameter to get flexible result lists. However, since it is based on the collector interface, the SOLR collector cannot deal with the wealth of additional information that is provided with the search result.
Enter OpenCms 10 <search /> tag. This new tag has been specifically designed to be a drop-in replacement the <collector /> tag, tailored especially for SOLR queries and result sets. Using this new tag you can easily generate advanced searches including facets and “did you mean” results.
In this session, an overview is provided about the SOLR integration in OpenCms in general. The SOLR collector with the new <search /> tag available in 10 will be compared and best practices of using SOLR in OpenCms 9.5 and 10 will be provided.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
2. JavaScript, Sixth Edition 2
Objectives
When you complete this chapter, you will be able to:
• Enhance form usability with JavaScript
• Customize browser-based HTML validation
• Implement custom validation to check for errors and
display error messages
3. JavaScript, Sixth Edition 3
Using JavaScript with Forms
• Validation
– checking that form information provided by users
conforms to data rules
• form object
– Represents a form in an HTML document
– Used to access form and its data
4. JavaScript, Sixth Edition 4
Table 6-1 Properties of form objects
Using JavaScript with Forms (cont’d.)
Table 6-3 Methods of form objects
Table 6-2 Event of form objects
5. JavaScript, Sixth Edition 5
Using JavaScript with Forms (cont'd.)
• Common elements for collecting form data:
– input
– select
– option
– textarea
– button
6. JavaScript, Sixth Edition 6
Table 6-4 Properties of elements within forms
Working with Input Fields (cont’d.)
7. JavaScript, Sixth Edition 7
Table 6-5 Methods of elements within forms
Working with Input Fields (cont’d.)
Table 6-6 Events of elements within forms
8. JavaScript, Sixth Edition 8
Referencing Forms and Form Elements
• Can use getElementsByTagName() method:
getElementsByTagName("form")[0]
• Document object includes a forms[] array
– Contains all forms on a web page
• form object has an elements[] array
9. JavaScript, Sixth Edition 9
Referencing Forms and Form Elements
(cont’d.)
• elements[] array
– Contains objects representing each control in a form
• Reference form index number in the forms[] array
– Followed by the appropriate element index number
from the elements[] array
10. JavaScript, Sixth Edition 10
Improving Form Usability
• Before validation
– Can reduce amount of validation necessary
11. JavaScript, Sixth Edition 11
Designing Forms to Collect More
Accurate Content
• Replace input boxes with other fields that present
limited choices
12. JavaScript, Sixth Edition 12
Designing Forms to Collect More
Accurate Content (cont'd.)
Table 6-7 Selected form elements for providing limited choices
13. JavaScript, Sixth Edition 13
Designing Forms to Collect More
Accurate Content (cont'd.)
Figure 6-3 Sample fieldset updated with option buttons and selection lists
Figure 6-2 Sample fieldset containing input elements
14. JavaScript, Sixth Edition 14
Programming Forms to Increase
Content Accuracy
• Assistive functions
– Reduce likelihood of user errors
– Prevent users from entering erroneous data
• Removing default values from selection lists
– Can set default value for selection list in HTML
• Only to one of the options
– JavaScript can set selectedIndex property to -1
• Corresponds to no selection
15. JavaScript, Sixth Edition 15
Programming Forms to Increase
Content Accuracy (cont'd.)
Table 6-8 select element properties
16. JavaScript, Sixth Edition 16
Programming Forms to Increase
Content Accuracy (cont'd.)
• Dynamically Updating Selection List Values
– Can add or remove option elements from a select
element using node methods
• Can change list options based on selection in another
field
17. JavaScript, Sixth Edition 17
Programming Forms to Increase
Content Accuracy (cont'd.)
Table 6-9 Properties of option elements
18. JavaScript, Sixth Edition 18
Programming Forms to Increase
Content Accuracy (cont'd.)
Figure 6-5 Diagram of function for dynamically updating selection list values
19. JavaScript, Sixth Edition 19
Programming Forms to Increase
Content Accuracy (cont'd.)
• Adding Placeholder Text for Older Browsers
– placeholder attribute of input and textarea
elements
• Supported by modern browsers
• Can recreate behavior with JavaScript for older
browsers:
– Add placeholder text when page finishes loading
– Remove placeholder text when user selects field
– Add back placeholder text if user makes no entry
20. JavaScript, Sixth Edition 20
Programming Forms to Increase
Content Accuracy (cont'd.)
• Automatically updating an associated field based on
a user entry
– Multiple elements may be associated
• Example: check box to indicate textarea entry
– Can automatically change value of one field in
response to change in other field
21. JavaScript, Sixth Edition 21
Programming Forms to Increase
Content Accuracy (cont'd.)
• Transferring duplicate field values
– Can copy data from one field to another based on
user indicating they should have the same value
• Example: Shipping Address and Billing Address
22. JavaScript, Sixth Edition 22
Programming Forms to Increase
Content Accuracy (cont'd.)
Figure 6-10 Billing Address entries copied to Delivery Address section
23. JavaScript, Sixth Edition 23
Customizing Browser-Based Validation
• Modern browsers can perform some validation
– Known as browser-based validation, native validation,
or HTML5 validation
24. JavaScript, Sixth Edition 24
Customizing Browser-Based Validation
(cont'd.)
• Specifying browser-based validation parameters
– Use attributes listed in Table 6-12
Table 6-12 HTML attributes to set browser-based validation parameters
25. JavaScript, Sixth Edition 25
Customizing Browser-Based Validation
(cont'd.)
• Specifying browser-based validation parameters
– Additional validation linked to input type values
Table 6-13 Values for type attribute that trigger browser-based validation
26. JavaScript, Sixth Edition 26
Customizing Browser-Based Validation
(cont'd.)
• Customizing browser-based validation feedback
– Modern browsers display feedback in similar ways,
with variation
• Displayed after submit event triggered
• Invalid controls highlighted
• Bubble displayed next to first control
27. JavaScript, Sixth Edition 27
Customizing Browser-Based Validation
(cont'd.)
• Customizing browser-based validation feedback
(cont'd.)
– Customizable through constraint validation API
• All properties of validity object must have value of
false for element to be valid
29. JavaScript, Sixth Edition 29
Customizing Browser-Based Validation
(cont'd.)
• Customizing browser-based validation feedback
(cont'd.)
– checkValidity() and setCustomValidity()
methods
– CSS :invalid and :valid pseudo-classes
• Use to change properties of form elements based on
validity status
30. JavaScript, Sixth Edition 30
Customizing Browser-Based Validation
(cont'd.)
• Customizing browser-based validation feedback
(cont'd.)
var fname = document.getElementbyId("firstName");
if (fname.valueMissing) {
setCustomValidity("Please fill out this field.");
}
#firstName:invalid {
background: rgb(255,233,233);
}
JavaScript
CSS
32. JavaScript, Sixth Edition 32
Customizing Browser-Based Validation
(cont'd.)
• Customizing browser-based validation feedback
(cont'd.)
– Bubble appearance varies among browsers
– Cannot set multiple validation messages for a single
field at once
– Can disable browser-based validation using the
preventDefault() method and the invalid
event
• If disabled, must program custom validation
33. JavaScript, Sixth Edition 33
Programming Custom Validation
• Common validation functions:
– Checking that required fields contain entries
– Checking values dependent on other fields
– Checking for appropriate content type
34. JavaScript, Sixth Edition 34
Validating Submitted Data
• submit event fires when a form is submitted
– Often when submit button selected
– Data usually validated when submit event fires
– preventDefault() method disables default
behavior of an event when it fires
• Not supported in IE8, so set returnValue to false
instead
35. JavaScript, Sixth Edition 35
Validating Required Fields with Custom
Functions
• Retrieve values of required fields, then check if any
is empty
36. JavaScript, Sixth Edition 36
Validating Required Fields with Custom
Functions (cont’d.)
• Checking for empty text input fields
– Check value property for a value
– Use loop statement to check each field in a group
if (document.getElementById("firstName").value === "") {
// code to run if the field is blank
}
37. JavaScript, Sixth Edition 37
Validating Required Fields with Custom
Functions (cont’d.)
• Checking for selection lists with no values
– Check value of selectedIndex property
• If no option is selected, value is -1
if (document.getElementById("state").selectedIndex === -1 {
// code to run if the field is blank
}
38. JavaScript, Sixth Edition 38
Validating Required Fields with Custom
Functions (cont’d.)
• Checking for option button sets with no selection
– Check value of checked property
– Use And (&&) operators to check if no option button is
selected
var buttons = document.getElementsByName("Color");
if (!buttons[0].checked && !buttons[1].checked && ↵
!buttons[2].checked) {
// code to run if no button is selected
}
39. JavaScript, Sixth Edition 39
Validating Dependent Fields with
Custom Functions
• Sometimes need to test logic specific to a form
• Validating based on the state of a check box
– Access same checked property used with option
button
• Validating based on text input box contents
– Can use nested if statements to account for
possibilities when entry in one text box requires entry
in another
40. JavaScript, Sixth Edition 40
Validating Dependent Fields with
Custom Functions (cont'd.)
Figure 6-21 Flowchart diagram of validateCreateAccount() function
41. JavaScript, Sixth Edition 41
Validating Content Type with Custom
Functions
• Can check whether numeric fields contain numbers
– Use isNaN() function
• returns true if value is not a number
isNaN(document.getElementById("subtotal").value)
• Character patterns like zip codes require regular
expressions (Chapter 8)
42. JavaScript, Sixth Edition 42
Summary
• Validation checks that information conforms to rules
• Assistive functions reduce likelihood of user errors
• Browser-based validation is built into modern
browsers
– Customizable through Constraint Validation API
• preventDefault() method blocks action
normally associated with an event
43. JavaScript, Sixth Edition 43
Summary (cont’d.)
• To validate required text input fields
– Retrieve the values of the required fields
– Check if the value of any of them is an empty string
• To validate required selection lists
– Retrieve the selectedIndex value
– Check whether it’s equal to -1
44. JavaScript, Sixth Edition 44
Summary (cont’d.)
• To check if an option button is selected, access the
value of its checked property.
• To check if none of the option buttons in a set are
selected, create a conditional statement using And
(&&) operators
• In some cases, you need to create validation
functions to test logic specific to your form