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Archive for the ‘ajax’ Category

How to implement an Ajax editing in CodeCharge Studio like in the picture above? Is it easy or not? Yes, it’s easy! It takes a half an hour at the maximum. In this article, I will provide step by step instructions. Also, you can download an example here.

The main idea of this example is the ajax editing without the page refresh. When you click a link in the Grid the Show Modal dialog is opened. The Show Modal dialog contains a Record that allows to edit the data. All the actions are performed inside the Update Panels. Well, stay reading and you will see how to do it…

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Hi everybody! I’ve just had a discussion of how to test for an emtpy javascript object. As a result, I have several code snippets and I want to share them.

Problem

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  alert({} == null); // false
  alert({} == {}); // false
  alert({} == {}); // false
  alert({} == 0); // false
  alert({} == ""); // false
  alert({} == []); // false
  // etc :)

So, none of the expressions above can check for an empty javascript object.

Pure javascript solution

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  function empty(o) {
    for(var i in o) 
      if(o.hasOwnProperty(i))
        return false;
 
      return true;
  }

JQuery + JQuery.JSON solution

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  var o = {};
  alert($.toJSON(o) == '{}'); // true
 
  var o = {a: 1};
  alert($.toJSON(o) == '{}'); // false

The code above simply converts an object to JSON string.

UPDATE: jQuery.isEmptyObject method

As of jQuery 1.4, there’s isEmptyObject method to detect is the object empty. Look at the followtin code for example:

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  $.isEmptyObject({}); // true
  $.isEmptyObject({someprop: "true"}); // false

Your way

Well, if you have your way of checking for an empty javascript object I am waiting your comments! Thanks in advance!

Links

jQuery.isEmptyObject

hasOwnProperty documentation

JQuery JavaScript Library

Recently, i had a problem with YUI AutoComplete layout. I wanted it being inline, fixed width and working with different browsers like IE6/7/8, Opera, FF etc. There were some problems that i solved primarily in CSS. More precisely, i needed an inline YUI AutoComplete layout in such a way that i can place autocomplete next to the without a line break. I just set my styles in CSS and override some existing styles and it works ok!

So, problems i had to solve for my needs:

• an outer container is a DIV so INPUT always goes on the next line
• inline-block for DIV doesn’t work in IE6/7
• an outer container has width of 100%
• INPUT is absolutely positioned so an outer DIV is collapsed
• width of 100% makes INPUT 6px larger then outer DIV in IE6
• using inline-block, INPUT aligns vertically on the bottom in IE6

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