Class Ext.XTemplate

A template class that supports advanced functionality like autofilling arrays, conditional processing with basic comparison operators, sub-templates, basic math function support, special built-in template variables, inline code execution and more. XTemplate also provides the templating mechanism built into Ext.DataView.

XTemplate supports 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. The following examples demonstrate all of the supported features. This is the data object used for reference in each code example:

var data = {
    name: 'Jack Slocum',
    title: 'Lead Developer',
    company: 'Ext JS, LLC',
    email: 'jack@extjs.com',
    address: '4 Red Bulls Drive',
    city: 'Cleveland',
    state: 'Ohio',
    zip: '44102',
    drinks: ['Red Bull', 'Coffee', 'Water'],
    kids: [{
        name: 'Sara Grace',
        age:3
    },{
        name: 'Zachary',
        age:2
    },{
        name: 'John James',
        age:0
    }]
};

Auto filling of arrays and scope switching
Using the tpl tag and the for operator, you can switch to the scope of the object specified by for and access its members to populate the teamplte. If the variable in for is an array, it will auto-fill, repeating the template block inside the tpl tag for each item in the array:

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Title: {title}</p>',
    '<p>Company: {company}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<p>{name}</p>',
    '</tpl></p>'
);
tpl.overwrite(panel.body, data);

Access to parent object from within sub-template scope
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);

Array item index and basic math support
While processing an array, the special variable {#} will provide the current array index + 1 (starts at 1, not 0). Templates also support the basic math operators + - * and / that can be applied directly on numeric data values:

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<tpl if="age > 1">',
            '<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);

Auto-rendering of flat arrays
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);

Basic conditional logic
Using the tpl tag and the if operator you can provide conditional checks for deciding whether or not to render specific parts of the template. Note that there is no else operator — if needed, you should use two opposite if statements. Properly-encoded attributes are required as seen in the following example:

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<tpl if="age &gt; 1">',  // <-- Note that the > is encoded
            '<p>{name}</p>',
        '</tpl>',
    '</tpl></p>'
);
tpl.overwrite(panel.body, data);

Ability to execute arbitrary inline code
In an XTemplate, 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.
• fm: An alias for Ext.util.Format.

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Company: {[company.toUpperCase() + ', ' + 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 defined directly on the config 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>',
        '<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>', {
     isGirl: function(name){
         return name == 'Sara Grace';
     },
     isBaby: function(age){
        return age < 1;
     }
});
tpl.overwrite(panel.body, data);