JQuery and prototype namespace -


hello starting jquery plugins, having problems understanding namespace.

given example below, when enter "submit" function, how prototype instance inside submit function? "var self = this;" in other function? in method refers form element. 

(function ($, window, document, undefined) {     var pluginprototype = {         init: function (options, element) {             var self = this;              $(element).find('form').submit(self.submit);             self.othermethod();         },          submit: function(){             var self = this; // form element         },          othermethod: function () {             var self = this; // prototype         },     }      $.fn.pluginname = function (options) {         return this.each(function () {             var plugin = object.create(pluginprototype);             plugin.init(options, this);              $.data(this, 'pluginname', comment);             //              // $.data($(select)[0], 'comment');         });     };      $.fn.pluginname.settings = {      }; }(jquery, window, document));

actually, there misunderstood concepts here:

  1. there's no "prototype instance" in case. prototype property of functions when used constructors. in case, pluginprototype plain object, prototype object.prototype.

  2. "this" keword containing current function execution context , can modified depending on how call given function.

  3. i suggest reading bit jquery plugin development here: http://learn.jquery.com/plugins/

that said, can suggest typical approach:

  1. have methods of plugin properties of "methods" object (your current pluginprototype)

  2. implement logic inside $.fn.pluginname function handle different execution requests. 

    return this.each(function() {     if (methods[method]) {         return methods[method].apply(this, array.prototype.slice.call(parameters, 1));     } else if ( typeof method === "object" || ! method ) {         return methods.init.apply(this, parameters);     } else {         $.error("method "+method+"does not exist on wonderful plugin");     } });

    a. plugin initialization called via $("…").plugin({option: value, …});

    b. plugin methods called via $("…").plugin("method name", argument1, argument2, …);

  3. all methods called "this" pointing current jquery-wrapped dom element; so, call method inside method go with:

    methods.methodname.call(this, argument1, argument2);

hope helps you.


Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db : ...
Read more

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite...
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle); ...
Read more