Tag: JavaScript

In the bad old days of desktop applications, every form object in the world had a Dirty property that let you easily check to see if the user had made any changes to the data on the form. It’s almost as easy with client-side code running in the Web browser, provided you use jQuery. This line finds every input tag and ties the tag’s change event to a JavaScript function called flagChanges:

$("input").change(function () 
            {
              flagChanges();
            });

Read more in Visual Studio Magazine;

Other References

https://www.c-sharpcorner.com/blogs/page-is-dirty-using-javascript1

This page shows example of JSON and XML. This is a handy reference only;

{
    "glossary": {
        "title": "example glossary",
		"GlossDiv": {
            "title": "S",
			"GlossList": {
                "GlossEntry": {
                    "ID": "SGML",
					"SortAs": "SGML",
					"GlossTerm": "Standard Generalized Markup Language",
					"Acronym": "SGML",
					"Abbrev": "ISO 8879:1986",
					"GlossDef": {
                        "para": "A meta-markup language, used to create markup languages such as DocBook.",
						"GlossSeeAlso": ["GML", "XML"]
                    },
					"GlossSee": "markup"
                }
            }
        }
    }
}
The same text expressed as XML:

<!DOCTYPE glossary PUBLIC "-//OASIS//DTD DocBook V3.1//EN">
 <glossary><title>example glossary</title>
  <GlossDiv><title>S</title>
   <GlossList>
    <GlossEntry ID="SGML" SortAs="SGML">
     <GlossTerm>Standard Generalized Markup Language</GlossTerm>
     <Acronym>SGML</Acronym>
     <Abbrev>ISO 8879:1986</Abbrev>
     <GlossDef>
      <para>A meta-markup language, used to create markup
languages such as DocBook.</para>
      <GlossSeeAlso OtherTerm="GML">
      <GlossSeeAlso OtherTerm="XML">
     </GlossDef>
     <GlossSee OtherTerm="markup">
    </GlossEntry>
   </GlossList>
  </GlossDiv>
 </glossary>
{"menu": {
  "id": "file",
  "value": "File",
  "popup": {
    "menuitem": [
      {"value": "New", "onclick": "CreateNewDoc()"},
      {"value": "Open", "onclick": "OpenDoc()"},
      {"value": "Close", "onclick": "CloseDoc()"}
    ]
  }
}}
The same text expressed as XML:

<menu id="file" value="File">
  <popup>
    <menuitem value="New" onclick="CreateNewDoc()" />
    <menuitem value="Open" onclick="OpenDoc()" />
    <menuitem value="Close" onclick="CloseDoc()" />
  </popup>
</menu>

Reference

https://json.org/example.html

Fonts are letters, numbers, and symbols designed using specific typefaces. They can apply to various design elements such as logos, headings, and body text. On the other hand, PNG (Portable Network Graphics) transparent designs are images with transparent backgrounds that can be layered over other graphics or backgrounds.

The main difference between font vs PNG transparent designs is their application. Font use to create typographic designs, while PNG transparent designs  use for creating image-based designs with transparency.

Fonts are ideal for creating text-heavy designs, while PNG transparent designs are perfect for creating graphics with intricate details such as icons, logos, and illustrations.

Since fonts are letters, numbers and symbols so it is possible they can not be rendered in some UI components. The rendering experience is an empty space with alternate text only. For example;

<a class="foo" title="Delete" href="#" onclick="foo.display(33);CancelEvent(event);\">
	<i class="fa fa-trash\"></i> Trash
</a>

Plus and Minu are universal fonts recognized by almost all components.

<a class="foo" title="Delete" href="#" onclick="foo.display(33);CancelEvent(event);\">
	<i class="fa fa-add\"></i> Trash
</a>

If a component doesn’t support font then + and – symbol will be rendered without any styles.

In the world of modern web, icons have become an indelible and integral part of UI design. Read about Font and SVG (Scalable vector graphics) icons. majority of the web development community prefers to use SVG icons;

Read more about Fonts Vs SVG here

Read about how to use SVG images in CSS and HTML here

Create three dropdown lists, inside an HTML form.

The second and third dropdown list will display different options, depending on the value selected in the parent dropdown list.

Add HTML;

<form name="form1" id="form1" action="/action_page.php">
  Subjects: <select name="subject" id="subject">
    <option value="" selected="selected">Select subject</option>
  </select>
  <br><br>
  Topics: <select name="topic" id="topic">
    <option value="" selected="selected">Please select subject first</option>
  </select>
  <br><br>
  Chapters: <select name="chapter" id="chapter">
    <option value="" selected="selected">Please select topic first</option>
  </select>
  <br><br>
  <input type="submit" value="Submit">
</form>

Add JavaScript;

var subjectObject = {
  "Front-end": {
    "HTML": ["Links", "Images", "Tables", "Lists"],
    "CSS": ["Borders", "Margins", "Backgrounds", "Float"],
    "JavaScript": ["Variables", "Operators", "Functions", "Conditions"]
  },
  "Back-end": {
    "PHP": ["Variables", "Strings", "Arrays"],
    "SQL": ["SELECT", "UPDATE", "DELETE"]
  }
}
window.onload = function() {
  var subjectSel = document.getElementById("subject");
  var topicSel = document.getElementById("topic");
  var chapterSel = document.getElementById("chapter");
  for (var x in subjectObject) {
    subjectSel.options[subjectSel.options.length] = new Option(x, x);
  }
  subjectSel.onchange = function() {
    //empty Chapters- and Topics- dropdowns
    chapterSel.length = 1;
    topicSel.length = 1;
    //display correct values
    for (var y in subjectObject[this.value]) {
      topicSel.options[topicSel.options.length] = new Option(y, y);
    }
  }
  topicSel.onchange = function() {
    //empty Chapters dropdown
    chapterSel.length = 1;
    //display correct values
    var z = subjectObject[subjectSel.value][this.value];
    for (var i = 0; i < z.length; i++) {
      chapterSel.options[chapterSel.options.length] = new Option(z[i], z[i]);
    }
  }
}

Reference

https://www.w3schools.com/howto/howto_js_cascading_dropdown.asp

A JavaScript data grid with XML document. This is known as EJS TreeGrid.

Demos and installations are here;

https://www.treegrid.com/Doc/TreeGridHtml.html?Mark=html

Some tips and tricks;

For treegrid debugging (If we want to see what is the layout file and how the data is structured, call the layout or data directly)
http://localhost:5055/Finance/FileTableLayout?ProjectId=99

Here are some useful links;

https://www.treegrid.com/

https://www.treegrid.com/Doc/ColAdd.htm

https://www.treegrid.com/Examples/Html/AppPivotTable/PivotTable.html

https://www.treegrid.com/Doc/Pivot.htm