以下代碼中，請問：
1、validate 函式 什么時候會被觸發
2、$.extend($.fn 中 .extend 是什么用法 ， $.fn 是什么東西？
(function($) {
$.extend($.fn, {
// http://docs.jquery.com/Plugins/Validation/validate
validate: function( options ) {
// if nothing is selected, return nothing; can't chain anyway
if ( !this.length ) {
if ( options && options.debug && window.console ) {
console.warn( "Nothing selected, can't validate, returning nothing." );
}
return;
}
// check if a validator for this form was already created
var validator = $.data( this[0], "validator" );
if ( validator ) {
return validator;
}
// Add novalidate tag if HTML5.
this.attr( "novalidate", "novalidate" );
validator = new $.validator( options, this[0] );
$.data( this[0], "validator", validator );
if ( validator.settings.onsubmit ) {
this.validateDelegate( ":submit", "click", function( event ) {
if ( validator.settings.submitHandler ) {
validator.submitButton = event.target;
}
// allow suppressing validation by adding a cancel class to the submit button
if ( $(event.target).hasClass("cancel") ) {
validator.cancelSubmit = true;
}
// allow suppressing validation by adding the html5 formnovalidate attribute to the submit button
if ( $(event.target).attr("formnovalidate") !== undefined ) {
validator.cancelSubmit = true;
}
});
// validate the form on submit
this.submit( function( event ) {
if ( validator.settings.debug ) {
// prevent form submit to be able to see console output
event.preventDefault();
}
function handle() {
var hidden;
if ( validator.settings.submitHandler ) {
if ( validator.submitButton ) {
// insert a hidden input as a replacement for the missing submit button
hidden = $("<input type='hidden'/>").attr("name", validator.submitButton.name).val( $(validator.submitButton).val() ).appendTo(validator.currentForm);
}
validator.settings.submitHandler.call( validator, validator.currentForm, event );
if ( validator.submitButton ) {
// and clean up afterwards; thanks to no-block-scope, hidden can be referenced
hidden.remove();
}
return false;
}
return true;
}
// prevent submit for invalid forms or custom submit handlers
if ( validator.cancelSubmit ) {
validator.cancelSubmit = false;
return handle();
}
if ( validator.form() ) {
if ( validator.pendingRequest ) {
validator.formSubmitted = true;
return false;
}
return handle();
} else {
validator.focusInvalid();
return false;
}
});
}
return validator;
},
// http://docs.jquery.com/Plugins/Validation/valid
valid: function() {
if ( $(this[0]).is("form")) {
return this.validate().form();
} else {
var valid = true;
var validator = $(this[0].form).validate();
this.each(function() {
valid = valid && validator.element(this);
});
return valid;
}
},
// attributes: space seperated list of attributes to retrieve and remove
removeAttrs: function( attributes ) {
var result = {},
$element = this;
$.each(attributes.split(/\s/), function( index, value ) {
result[value] = $element.attr(value);
$element.removeAttr(value);
});
return result;
},
// http://docs.jquery.com/Plugins/Validation/rules
rules: function( command, argument ) {
var element = this[0];
if ( command ) {
var settings = $.data(element.form, "validator").settings;
var staticRules = settings.rules;
var existingRules = $.validator.staticRules(element);
switch(command) {
case "add":
$.extend(existingRules, $.validator.normalizeRule(argument));
// remove messages from rules, but allow them to be set separetely
delete existingRules.messages;
staticRules[element.name] = existingRules;
if ( argument.messages ) {
settings.messages[element.name] = $.extend( settings.messages[element.name], argument.messages );
}
break;
case "remove":
if ( !argument ) {
delete staticRules[element.name];
return existingRules;
}
var filtered = {};
$.each(argument.split(/\s/), function( index, method ) {
filtered[method] = existingRules[method];
delete existingRules[method];
});
return filtered;
}
}
var data = $.validator.normalizeRules(
$.extend(
{},
$.validator.classRules(element),
$.validator.attributeRules(element),
$.validator.dataRules(element),
$.validator.staticRules(element)
), element);
// make sure required is at front
if ( data.required ) {
var param = data.required;
delete data.required;
data = $.extend({required: param}, data);
}
return data;
}
});
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標籤：JavaScript