This document is a draft, and is designed to show changes from a previous version. It is presently showing added text,changed text,deleted text,[start]/[end] markers,and Issue Numbers.
Changes are displayed as follows:
Adobe Flash-based Content
Adobe Flash Professional version MX and higher
This technique relates to:
The objective of this technique is to validate user input as values are entered for each field, by means of client-side scripting. If errors are found, a description is added to the controls that have invalid data. Visually, the description will be placed adjacent to the control. Additionally, the error message text is added to the control's accessible description so that it is readable by assistive technology when the control receives focus.
Editorial Note: In the wiki this technique was indicated as applying to SC 3.3.4. However, don't see how that fits and removed that.
In this example, a sample form is shown with two text fields ('name' and 'zip code'). Both fields are required. When the form's submit button is pressed, the values of the text fields will be validated. If a textfield contains an invalid value, an _accProps object is created for the textfield, and its description property is set the error message.
Note: Instead of using the accessible description, the error text can also be added to the accessible name (_accProps.name), which is supported by a wider range of assistive technology than the _accProps.description property.
The results for this technique are shown in the working version of validating a text field
ActionScript 2.0 Code for Example 1
Example Code:
import flash.accessibility.*;
import mx.accessibilty.ButtonAccImpl;
import mx.controls.Alert;
import mx.accessibility.AlertAccImpl;
AlertAccImpl.enableAccessibility();
ButtonAccImpl.enableAccessibility;
resetTextFieldAccNames();
Accessibility.updateProperties();
submit_btn.addEventListener("click", handleClick);
function handleClick(e) {
//reset values
resetTextFieldAccNames();
resetTextFieldAccDescriptions();
resetErrorLabels();
//perform validation
var errors= [];
if (name_txt.text == '')
errors.push([name_txt, "You must enter your name", name_error_lbl]);
if (zipcode_txt.text == '')
errors.push([zipcode_txt, "You must enter your zip code", zipcode_error_lbl]);
else if (zipcode_txt.text.length != 5 || isNaN(zipcode_txt.text))
errors.push([zipcode_txt, "Zip code must be 5 digits", zipcode_error_lbl]);
//add validation error messages, if any
var field, errorMsg, errorLabel;
if (errors.length > 0) {
//loop over encountered errors
for (var i = 0; i < errors.length; i++) {
field = errors[i][0];
errorMsg = errors[i][1];
errorLabel = errors[i][2];
updateAccDescription(field, "Warning: " + errorMsg);
errorLabel.text = errorMsg;
}
}
else {
Alert.show("Form field values were entered correctly");
}
Accessibility.updateProperties();
}
function updateAccName(obj, newName:String) {
if (!obj._accProps)
obj._accProps = new Object();
obj._accProps.name = newName;
}
function updateAccDescription(obj, newDescription:String) {
if (!obj._accProps)
obj._accProps = new Object();
obj._accProps.description = newDescription;
}
function getAccName(obj) {
return obj._accProps ? obj._accProps.name : "";
}
function resetTextFieldAccNames() {
updateAccName(name_txt, "name, required");
updateAccName(zipcode_txt, "zip code, required");
}
function resetTextFieldAccDescriptions() {
updateAccDescription(name_txt, "");
updateAccDesciption(zipcode_txt, "");
}
function resetErrorLabels() {
name_error_lbl.text = "";
zipcode_error_lbl.text = "";
}When a Flash movie provides interactive forms that can be submitted, confirm that:
The validation warnings are placed next to the control visually.
The validation warnings are added to the accessible name or description of each control.
#1 and #2 are true