/**
* @class Ext.XTemplate
* @extends Ext.Template
* A template class that supports advanced functionality like:
* - Autofilling arrays using templates and sub-templates
* - Conditional processing with basic comparison operators
* - Basic math function support
* - Execute arbitrary inline code with special built-in template variables
* - Custom member functions
* - Many special tags and built-in operators that aren't defined as part of
* the API, but are supported in the templates that can be created
*
XTemplate provides the templating mechanism built into:
*
* The {@link Ext.Template} describes
* the acceptable parameters to pass to the constructor. The following
* examples demonstrate all of the supported features.
*
*
*
* - Sample Data
*
*
This is the data object used for reference in each code example:
*
var data = {
name: 'Tommy Maintz',
title: 'Lead Developer',
company: 'Ext JS, Inc',
email: 'tommy@extjs.com',
address: '5 Cups Drive',
city: 'Palo Alto',
state: 'CA',
zip: '44102',
drinks: ['Coffee', 'Soda', 'Water'],
kids: [{
name: 'Joshua',
age:3
},{
name: 'Matthew',
age:2
},{
name: 'Solomon',
age:0
}]
};
*
*
*
* - Auto filling of arrays
*
*
The tpl tag and the for operator are used
* to process the provided data object:
*
* - If the value specified in for is an array, it will auto-fill,
* repeating the template block inside the tpl tag for each item in the
* array.
* - If for="." is specified, the data object provided is examined.
* - While processing an array, the special variable {#}
* will provide the current array index + 1 (starts at 1, not 0).
*
*
*
<tpl for=".">...</tpl> // loop through array at root node
<tpl for="foo">...</tpl> // loop through array at foo node
<tpl for="foo.bar">...</tpl> // loop through array at foo.bar node
* Using the sample data above:
*
var tpl = new Ext.XTemplate(
'<p>Kids: ',
'<tpl for=".">', // process the data.kids node
'<p>{#}. {name}</p>', // use current array index to autonumber
'</tpl></p>'
);
tpl.overwrite(panel.body, data.kids); // pass the kids property of the data object
*
An example illustrating how the for property can be leveraged
* to access specified members of the provided data object to populate the template:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Title: {title}</p>',
'<p>Company: {company}</p>',
'<p>Kids: ',
'<tpl for="kids">', // interrogate the kids property within the data
'<p>{name}</p>',
'</tpl></p>'
);
tpl.overwrite(panel.body, data); // pass the root node of the data object
*
Flat arrays that contain values (and not objects) can be auto-rendered
* using the special {.} variable inside a loop. This variable
* will represent the value of the array at the current index:
*
var tpl = new Ext.XTemplate(
'<p>{name}\'s favorite beverages:</p>',
'<tpl for="drinks">',
'<div> - {.}</div>',
'</tpl>'
);
tpl.overwrite(panel.body, data);
*
When processing a sub-template, for example while looping through a child array,
* you can access the parent object's members via the parent object:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Kids: ',
'<tpl for="kids">',
'<tpl if="age > 1">',
'<p>{name}</p>',
'<p>Dad: {parent.name}</p>',
'</tpl>',
'</tpl></p>'
);
tpl.overwrite(panel.body, data);
*
*
*
* - Conditional processing with basic comparison operators
*
*
The tpl tag and the if operator are used
* to provide conditional checks for deciding whether or not to render specific
* parts of the template. Notes:
* - Double quotes must be encoded if used within the conditional
* - There is no else operator — if needed, two opposite
* if statements should be used.
*
*
<tpl if="age > 1 && age < 10">Child</tpl>
<tpl if="age >= 10 && age < 18">Teenager</tpl>
<tpl if="this.isGirl(name)">...</tpl>
<tpl if="id==\'download\'">...</tpl>
<tpl if="needsIcon"><img src="{icon}" class="{iconCls}"/></tpl>
// no good:
<tpl if="name == "Tommy"">Hello</tpl>
// encode " if it is part of the condition, e.g.
<tpl if="name == "Tommy"">Hello</tpl>
*
* Using the sample data above:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Kids: ',
'<tpl for="kids">',
'<tpl if="age > 1">',
'<p>{name}</p>',
'</tpl>',
'</tpl></p>'
);
tpl.overwrite(panel.body, data);
*
*
*
* - Basic math support
*
*
The following basic math operators may be applied directly on numeric
* data values:
* + - * /
*
* For example:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Kids: ',
'<tpl for="kids">',
'<tpl if="age > 1">', // <-- Note that the > is encoded
'<p>{#}: {name}</p>', // <-- Auto-number each item
'<p>In 5 Years: {age+5}</p>', // <-- Basic math
'<p>Dad: {parent.name}</p>',
'</tpl>',
'</tpl></p>'
);
tpl.overwrite(panel.body, data);
*
*
*
* - Execute arbitrary inline code with special built-in template variables
*
*
Anything between {[ ... ]} is considered code to be executed
* in the scope of the template. There are some special variables available in that code:
*
* - values: The values in the current scope. If you are using
* scope changing sub-templates, you can change what values is.
* - parent: The scope (values) of the ancestor template.
* - xindex: If you are in a looping template, the index of the
* loop you are in (1-based).
* - xcount: If you are in a looping template, the total length
* of the array you are looping.
*
* This example demonstrates basic row striping using an inline code block and the
*
xindex variable:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Company: {[values.company.toUpperCase() + ", " + values.title]}</p>',
'<p>Kids: ',
'<tpl for="kids">',
'<div class="{[xindex % 2 === 0 ? "even" : "odd"]}">',
'{name}',
'</div>',
'</tpl></p>'
);
tpl.overwrite(panel.body, data);
*
*
* - Template member functions
*
*
One or more member functions can be specified in a configuration
* object passed into the XTemplate constructor for more complex processing:
*
var tpl = new Ext.XTemplate(
'<p>Name: {name}</p>',
'<p>Kids: ',
'<tpl for="kids">',
'<tpl if="this.isGirl(name)">',
'<p>Girl: {name} - {age}</p>',
'</tpl>',
// use opposite if statement to simulate 'else' processing:
'<tpl if="this.isGirl(name) == false">',
'<p>Boy: {name} - {age}</p>',
'</tpl>',
'<tpl if="this.isBaby(age)">',
'<p>{name} is a baby!</p>',
'</tpl>',
'</tpl></p>',
{
// XTemplate configuration:
compiled: true,
// member functions:
isGirl: function(name){
return name == 'Sara Grace';
},
isBaby: function(age){
return age < 1;
}
}
);
tpl.overwrite(panel.body, data);
*
*
*