JSWebComponent

Overview

JSWebComponent provides a wrapper for creating and managing web components in the Solution Model. It extends the JSComponent model and allows developers to define custom behaviors, attributes, and design-time properties. Web components are essential for building dynamic, responsive forms in web-based Servoy applications. ## Functionality

JSWebComponent includes properties such as cssPosition and anchors for defining layout behaviors, making it adaptable to resizing and responsive designs. Visibility, dimensions, and coordinates can be controlled via properties like x, y, width, height, and visible. The typeName property identifies the type of web component, as defined in the specification file.

Methods such as getAttribute, setJSONProperty, and getHandler provide tools for managing attributes, design-time properties, and event handlers. These methods enable dynamic configuration and integration of web components into forms. Utilities like getAttributes and getUUID facilitate introspection and metadata access.

JSWebComponent supports both design-time and runtime modifications, allowing components to be customized during development or adjusted dynamically at runtime.

For more details, refer to the RuntimeWebComponent section of this documentation.

Extends

JSComponent

Properties Summarized

Type	Name	Summary
Number	anchors	Enables a component to stick to a specific side of form and/or to grow or shrink when a window is resized.
CSSPosition	cssPosition	CSS position is a replacement for anchoring system making it more intuitive to place a component.
Boolean	enabled	The enable state of the component, default true.
Number	formIndex	The Z index of this component.
Number	height	The height in pixels of the component.
String	name	The name of the component.
String	typeName	The webcomponent type (name from the spec).
Boolean	visible	The visible property of the component, default true.
Number	width	The width in pixels of the component.
Number	x	The x coordinate of the component on the form.
Number	y	The y coordinate of the component on the form.

Methods Summarized

Type	Name	Summary
Object	getAttribute(name)	Get the value of an attribute of the element.
Array	getAttributes()	Returns the attribute names of an element.
String	getComment()	Returns the comment of this component.
Object	getDesignTimeProperty(key)	Get a design-time property of an element.
Array	getDesignTimePropertyNames()	Get the design-time properties of an element.
String	getFormName()	Returns the name of the form.
JSMethod	getHandler(handlerName)	Returns the JSMethod handler with the given name.
Object	getJSONProperty(propertyName)	Get the design-time value of the given property.
Array	getJSONPropertyNames(includeAll)	Get the list of property names this component supports.
UUID	getUUID()	Returns the UUID of this component.
Boolean	isJSONPropertySet(propertyName)	Returns whatever the design-time value of the given property was set.
Object	putDesignTimeProperty(key, value)	Set a design-time property of an element.
String	removeAttribute(name)	Remove the attribute of an element.
Object	removeDesignTimeProperty(key)	Clear a design-time property of an element.
void	resetHandler(handlerName)	Similar to resetJSONProperty but for handlers.
void	resetJSONProperty(propertyName)	Reset the design-time value of the given property.
void	setAttribute(name, value)	Set the attribute value of an element.
void	setHandler(handlerName, method)	Set the JSMethod handler for the given handler name.
void	setJSONProperty(propertyName, value)	Set the design-time value for the given property.

Properties Detailed

anchors

Enables a component to stick to a specific side of form and/or to grow or shrink when a window is resized.

If opposite anchors are activated then the component with grow or shrink with the window. For example if Top and Bottom are activated, then the component will grow/shrink when the window is vertically resized. If Left and Right are activated then the component will grow/shrink when the window is horizontally resized.

If opposite anchors are not activated, then the component will keep a constant distance from the sides of the window which correspond to the activated anchors.

Type Number The anchor configuration for the component.

Sample

var form = solutionModel.newForm('mediaForm', 'db:/example_data/parent_table', null, false, 400, 300);
var strechAllDirectionsLabel = form.newLabel('Strech all directions', 10, 10, 380, 280);
strechAllDirectionsLabel.background = 'red';
strechAllDirectionsLabel.anchors = SM_ANCHOR.ALL;
var strechVerticallyLabel = form.newLabel('Strech vertically', 10, 10, 190, 280);
strechVerticallyLabel.background = 'green';
strechVerticallyLabel.anchors = SM_ANCHOR.WEST | SM_ANCHOR.NORTH | SM_ANCHOR.SOUTH;
var strechHorizontallyLabel = form.newLabel('Strech horizontally', 10, 10, 380, 140);
strechHorizontallyLabel.background = 'blue';
strechHorizontallyLabel.anchors = SM_ANCHOR.NORTH | SM_ANCHOR.WEST | SM_ANCHOR.EAST;
var stickToTopLeftCornerLabel = form.newLabel('Stick to top-left corner', 10, 10, 200, 100);
stickToTopLeftCornerLabel.background = 'orange';
stickToTopLeftCornerLabel.anchors = SM_ANCHOR.NORTH | SM_ANCHOR.WEST; // This is equivalent to SM_ANCHOR.DEFAULT
var stickToBottomRightCornerLabel = form.newLabel('Stick to bottom-right corner', 190, 190, 200, 100);
stickToBottomRightCornerLabel.background = 'pink';
stickToBottomRightCornerLabel.anchors = SM_ANCHOR.SOUTH | SM_ANCHOR.EAST;

cssPosition

CSS position is a replacement for anchoring system making it more intuitive to place a component. CSS position should be set on form, an absolute position form can either work with anchoring or with css position. This is only working in NGClient.

Type CSSPosition The CSS position of the component.

Sample

var label = form.newLabel('Label', -1);
label.cssPosition.r("10").b("10").w("20%").h("30px")

enabled

The enable state of the component, default true.

Type Boolean True if the component is enabled; false otherwise.

Sample

var form = solutionModel.newForm('printForm', 'db:/example_data/parent_table', null, false, 400, 300);
var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
field.enabled = false;

formIndex

The Z index of this component. If two components overlap, then the component with higher Z index is displayed above the component with lower Z index.

Type Number The Z-index of the component.

Sample

var labelBelow = form.newLabel('Green', 10, 10, 100, 50);
labelBelow.background = 'green';
labelBelow.formIndex = 10;
var fieldAbove = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 30);
fieldAbove.background = '#FF0000';
fieldAbove.formIndex = 20;

height

The height in pixels of the component.

Type Number The width of the component in pixels.

Sample

var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
application.output('original width: ' + field.width);
application.output('original height: ' + field.height);
field.width = 200;
field.height = 100;
application.output('modified width: ' + field.width);
application.output('modified height: ' + field.height);

name

The name of the component. Through this name it can also accessed in methods. Must be a valid javascript name. (no - in the name or start with number)

Type String The name of the component.

Sample

var form = solutionModel.newForm('someForm', 'db:/example_data/parent_table', null, false, 620, 300);
var label = form.newLabel('Label', 10, 10, 150, 150);
label.name = 'myLabel'; // Give a name to the component.
forms['someForm'].controller.show()
// Now use the name to access the component.
forms['someForm'].elements['myLabel'].text = 'Updated text';

typeName

The webcomponent type (name from the spec).

Type String the type name of the web component, as defined in the specification file.

Sample

var wc = form.getWebComponent('mycomponent');
application.output(bean.typeName);

visible

The visible property of the component, default true.

Type Boolean True if the component is visible; false otherwise.

Sample

var form = solutionModel.newForm('printForm', 'db:/example_data/parent_table', null, false, 400, 300);
var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
field.visible = false;

width

The width in pixels of the component.

Type Number The width of the component in pixels.

Sample

var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
application.output('original width: ' + field.width);
application.output('original height: ' + field.height);
field.width = 200;
field.height = 100;
application.output('modified width: ' + field.width);
application.output('modified height: ' + field.height);

x

The x coordinate of the component on the form.

Type Number

Sample

var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
application.output('original location: ' + field.x + ', ' + field.y);
field.x = 90;
field.y = 90;
application.output('changed location: ' + field.x + ', ' + field.y);

y

The y coordinate of the component on the form.

Type Number The Y-coordinate position of the component.

Sample

var field = form.newField('parent_table_text', JSField.TEXT_FIELD, 10, 10, 100, 20);
application.output('original location: ' + field.x + ', ' + field.y);
field.x = 90;
field.y = 90;
application.output('changed location: ' + field.x + ', ' + field.y);

Methods Detailed

getAttribute(name)

Get the value of an attribute of the element.

Parameters

• String name the name of the attribute

Returns: Object The value of the specified attribute.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
var attributes = fld.getAttributes();
for (var i = 0; i < attributes.length; i++)
{
		application.output(fld.getAttribute(attributes[i]));
}

getAttributes()

Returns the attribute names of an element.

Returns: Array An array of attribute names for the component.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
var attributes = fld.getAttributes();
for (var i = 0; i < attributes.length; i++)
{
		application.output(fld.getAttribute(attributes[i]));
}

getComment()

Returns the comment of this component.

Returns: String the comment associated with this component.

Sample

var comment = solutionModel.getForm("my_form").getButton("my_button").getComment();
application.output(comment);

getDesignTimeProperty(key)

Get a design-time property of an element.

Parameters

• String key the name of the property

Returns: Object The value of the specified design-time property.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
var prop = fld.getDesignTimeProperty('myprop')

getDesignTimePropertyNames()

Get the design-time properties of an element.

Returns: Array An array of design-time property names for the component.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
var propNames = fld.getDesignTimePropertyNames()

getFormName()

Returns the name of the form. (may be empty string as well)

Returns: String The name of the form containing the component.

Sample

var name = myElement.getFormName();

getHandler(handlerName)

Returns the JSMethod handler with the given name.

Parameters

• String handlerName the name of the handler to get

Returns: JSMethod the JSMethod handler associated with the specified handler name.

Sample

var wc = form.getWebComponent('mycomponent');
var handler = wc.getHandler('onActionMethodID');

getJSONProperty(propertyName)

Get the design-time value of the given property. If the value was never set and the component has default value for the give property, that value will be returned. To check if the value was set, use isJSONPropertySet.

Parameters

• String propertyName the name of the property to get

Returns: Object the design-time value of the specified property, or the default value if not set.

Sample

var wc = form.getWebComponent('mycomponent');
application.output(wc.getJSONProperty('mytext')); // will output a string value if present for a string typed property
application.output(wc.getJSONProperty('mynumber')); // getter will return a number if present
application.output(JSON.stringify(wc.getJSONProperty('mycustomtype'), null, '  ')); // getter returns an object if present for custom types is spec files
application.output(JSON.stringify(wc.getJSONProperty('myarray'), null, '  ')); // getter returns an array type if present for array types
application.output(JSON.stringify(wc.getJSONProperty('myfoundset'), null, '  ')); // getter returns an object representing the design settings of the given property if present

//In case you want to change a more complex property (e.g. tabs) obtained with getJSONProperty, setJSONProperty must be used:
var tabs = jsTabPanel.getJSONPRoperty("tabs");
tabs[0].containsFormId = jsForm;
jsTabPanel.setJSONProperty("tabs", tabs);

getJSONPropertyNames(includeAll)

Get the list of property names this component supports. It can return all properties specified in spec file or only the properties that are set in json.

Parameters

• Boolean includeAll whether to return all properties from specification file or only the ones that are set in json

Returns: Array an array of property names supported by the web component. Includes all properties or only set properties based on the includeAll parameter.

Sample

var wc = form.getWebComponent('mycomponent');
application.output(wc.getJSONPropertyNames(true)); // will output all property names from the spec file
application.output(wc.getJSONPropertyNames(false)); // will output all property names that are set in component json

getUUID()

Returns the UUID of this component.

Returns: UUID the UUID of this component.

Sample

var button_uuid = solutionModel.getForm("my_form").getButton("my_button").getUUID();
application.output(button_uuid.toString());

isJSONPropertySet(propertyName)

Returns whatever the design-time value of the given property was set.

Parameters

• String propertyName the name of the property to check

Returns: Boolean true if the specified property is explicitly set, otherwise false.

Sample

var wc = form.getWebComponent('mycomponent');
var isSet = wc.isJSONPropertySet(''mytext''); // returns false
wc.setJSONProperty('mytext', 'Hello World Extended!');
isSet = wc.isJSONPropertySet(''mytext''); // returns true

putDesignTimeProperty(key, value)

Set a design-time property of an element. Value should be primitive data (string, boolean or number). Complex values should be stringified before call.

Parameters

• String key the name of the property

• Object value the value to store

Returns: Object The previous value of the specified design-time property, or null if none existed.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
fld.putDesignTimeProperty('myprop', 'strawberry')

removeAttribute(name)

Remove the attribute of an element.

Parameters

• String name the name of the attribute

Returns: String the deleted attribute value

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
fld.removeAttribute('keylistener')

removeDesignTimeProperty(key)

Clear a design-time property of an element.

Parameters

• String key the name of the property

Returns: Object The removed value of the specified design-time property.

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
fld.removeDesignTimeProperty('myprop')

resetHandler(handlerName)

Similar to resetJSONProperty but for handlers.

Parameters

• String handlerName the name of the handler to reset

Returns: void

Sample

var wc = form.getWebComponent('mycomponent'); // form is extending another form who's 'onActionMethodID' does something nice
wc.setHandler('onActionMethodID', form.getMethod('onCoolerAction'));
// hmm, I changed my mind - I like 'nice' action better
wc.resetHandler('onActionMethodID');

resetJSONProperty(propertyName)

Reset the design-time value of the given property. This makes it as if it was never set. It can be useful when working with form inheritance.

Parameters

• String propertyName the name of the property to reset

Returns: void

Sample

var wc = form.getWebComponent('mycomponent'); // form is extending another form who's 'mycomponent' has property 'mytext' set to something...
wc.setJSONProperty('mytext', 'Hello World Extended!');
// hmm I changed my mind - I like simple 'Hello World' better
wc.resetJSONProperty('mytext');

setAttribute(name, value)

Set the attribute value of an element.

Parameters

• String name the name of the attribute

• String value the value of the attribute

Returns: void

Sample

var frm = solutionModel.getForm('orders')
var fld = frm.getField('fld')
fld.setAttribute('keylistener', 'callback')

setHandler(handlerName, method)

Set the JSMethod handler for the given handler name. The handlerName is checked for existence in the component spec file, if the component does not declare this handler, an error is thrown. If the handler is already set, it will be replaced with the new JSMethod.

Parameters

• String handlerName the name of the handler to get

• JSMethod method the JSMethod to attach to the handler (can be also JSMethod that has arguments)

Returns: void

Sample

var wc = form.getWebComponent('mycomponent');
wc.setHandler('onActionMethodID', form.getMethod('onAction'));

setJSONProperty(propertyName, value)

Set the design-time value for the given property. For primitive property types you can just set the value. For more complex property types you can set a JSON value similar to what would be generated in the .frm file if you would design what you need using editor/properties view. Some property types can be assigned values in the runtime accepted format (for example border, font typed properties have a string representation at runtime and here as well).

Parameters

• String propertyName the name of the property to set

• Object value the new value of the property

Returns: void

Sample

var wc = form.getWebComponent('mycomponent');
wc.setJSONProperty('mytext', 'Hello World!');
wc.setJSONProperty('mynumber', 1);
wc.setJSONProperty('myborder', 'LineBorder,1,#ccffcc');
wc.setJSONProperty('mydynamicfoundset', { dataproviders: { dp1: "city", dp2: "country" }, foundsetSelector: "" }); // foundset property type using
    // the parent form's foundset and providing two columns of the foundset to client; see foundset property type wiki page for more information

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