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Friday, April 7, 2017

Add,Edit And Delete Rows From Table Dynamically Using JavaScript Html Page

<html>

<head>

</head>

<body>

<tr>

<th>Country</th>

</tr>

<td id="name_row1">Ankit</td>

<td id="country_row1">India</td>

<td>

</td>

</tr>

<td id="name_row2">Shawn</td>

<td id="country_row2">Canada</td>

<td>

</td>

</tr>

<td id="name_row3">Rahul</td>

<td id="country_row3">India</td>

<td>

</td>

</tr>

<tr>

</tr>

</table>

</div>

</body>

</html>

function edit_row(no) {

document.getElementById("edit_button" + no).style.display = "none";

document.getElementById("save_button" + no).style.display = "block";

var name = document.getElementById("name_row" + no);

var country = document.getElementById("country_row" + no);

var age = document.getElementById("age_row" + no);

var name_data = name.innerHTML;

var country_data = country.innerHTML;

var age_data = age.innerHTML;

name.innerHTML = "<input type='text' id='name_text" + no + "' value='" + name_data + "'>";

country.innerHTML = "<input type='text' id='country_text" + no + "' value='" + country_data + "'>";

age.innerHTML = "<input type='text' id='age_text" + no + "' value='" + age_data + "'>";

}

function save_row(no) {

var name_val = document.getElementById("name_text" + no).value;

var country_val = document.getElementById("country_text" + no).value;

var age_val = document.getElementById("age_text" + no).value;

document.getElementById("name_row" + no).innerHTML = name_val;

document.getElementById("country_row" + no).innerHTML = country_val;

document.getElementById("age_row" + no).innerHTML = age_val;

document.getElementById("edit_button" + no).style.display = "block";

document.getElementById("save_button" + no).style.display = "none";

}

function delete_row(no) {

document.getElementById("row" + no + "").outerHTML = "";

}

function add_row() {

var new_name = document.getElementById("new_name").value;

var new_country = document.getElementById("new_country").value;

var new_age = document.getElementById("new_age").value;

var table = document.getElementById("data_table");

var table_len = (table.rows.length) - 1;

var row = table.insertRow(table_len).outerHTML = "<tr id='row" + table_len + "'><td id='name_row" + table_len + "'>" + new_name + "</td><td id='country_row" + table_len + "'>" + new_country + "</td><td id='age_row" + table_len + "'>" + new_age + "</td><td><input type='button' id='edit_button" + table_len + "' value='Edit' class='edit' onclick='edit_row(" + table_len + ")'> <input type='button' id='save_button" + table_len + "' value='Save' class='save' onclick='save_row(" + table_len + ")'> <input type='button' value='Delete' class='delete' onclick='delete_row(" + table_len + ")'></td></tr>";

document.getElementById("new_name").value = "";

document.getElementById("new_country").value = "";

document.getElementById("new_age").value = "";

}

</script>

----------------------------------------------------------------------

Example 2:

<head>

<title>Create Elements Dynamically using jQuery</title>

</script>

</head>

<body>

</div>

</body>

$(document).ready(function () {

var iCnt = 0;

var container = $(document.createElement('div')).css({

padding: '8px', margin: '20px', width: '180px', border: '1px solid',

borderTopColor: '#000', borderBottomColor: '#000',

borderLeftColor: '#000', borderRightColor: '#000'

});

$('#btAdd').click(function () {

if (iCount <= 19) {

iCount = iCount + 1;

$(container).append('<input type=text class="input" id=tb' + iCount + ' ' +

'value="Text Element ' + iCount + '" />');

if (iCount == 1) {

var divSubmit = $(document.createElement('div'));

$(divSubmit).append('<input type=button class="bt"' +

'onclick="GetTextValue()"' +

'id=btSubmit value=Submit />');

}

$('#main').after(container, divSubmit);

}

else {

$(container).append('<label>Reached the limit</label>');

$('#btAdd').attr('class', 'bt-disable');

$('#btAdd').attr('disabled', 'disabled');

}

});

$('#btRemove').click(function () {

if (iCount != 0) { $('#tb' + iCount).remove(); iCount = iCount - 1; }

if (iCount == 0) {

$(container)

.empty()

.remove();

$('#btSubmit').remove();

$('#btAdd')

.removeAttr('disabled')

.attr('class', 'bt');

}

});

$('#btRemoveAll').click(function () {

$(container)

.empty()

.remove();

$('#btSubmit').remove();

iCount = 0;

$('#btAdd')

.removeAttr('disabled')

.attr('class', 'bt');

});

var divValue, values = '';

function GetTextValue() {

$(divValue)

.empty()

.remove();

values = '';

$('.input').each(function () {

divValue = $(document.createElement('div')).css({

padding: '5px', width: '200px'

});

values += this.value + '<br />'

});

$(divValue).append('<p><b>Your selected values</b></p>' + values);

$('body').append(divValue);

}

</script>

</html>

===============================================================

Example 3:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

$(document).ready(function () {

$('.del').live('click', function () {

$(this).parent().parent().remove();

});

$('.add').live('click', function () {

$(this).val('Delete');

$(this).attr('class', 'del');

var appendTxt = "<tr><td><input type='text' name='input_box_one[]' /></td> <td><input type='text' name='input_box_two[]' /></td> <td><input type='button' class='add' value='Add More' /></td></tr>";

$("tr:last").after(appendTxt);

});

</script>

</head>

<body>

<tr>

<td>Input-Box-One</td>

<td>Input-Box-Two</td>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</body>

</html>

=====================================================
Example 4:

<!DOCTYPE html>

<head>

<title>Dynamically Add/Remove Rows In HTML Table Using JavaScript</title>

function addRow(tableId) {

var listValues =

[{ value: "1", text: "Charity 1" }, { value: "2", text: "Charity 2" }, { value: "3", text: "Charity 3" }];

document.getElementById('hdnListCount').value = listValues.length;

var table = document.getElementById(tableId);

var listCount = document.getElementById('hdnListCount').value;

var rowCount = table.rows.length;

if (rowCount <= listCount) {

var row = table.insertRow(rowCount);

// Column 1

var cell1 = row.insertCell(0);

var ddlId = "ddlCharity" + ((rowCount - 1) + 1);

var element1 = document.createElement('select');

element1.setAttribute('id', ddlId);

for (var i = 0; i < listValues.length; i += 1) {

var option = document.createElement('option');

option.setAttribute('value', listValues[i].value);

option.appendChild(document.createTextNode(listValues[i].text));

element1.appendChild(option);

}

cell1.appendChild(element1);

// Column 2

var cell2 = row.insertCell(1);

var txtId = "txtDonationAmount" + ((rowCount - 1) + 1);

var element2 = document.createElement("input");

element2.setAttribute('id', txtId);

element2.type = "text";

element2.setAttribute('value', '0');

cell2.appendChild(element2);

// Column 3

var cell3 = row.insertCell(2);

var btnId = "btnDelete" + ((rowCount - 1) + 1);

var element3 = document.createElement("input");

element3.setAttribute('id', btnId);

element3.type = "button";

element3.setAttribute('value', 'Delete');

element3.onclick = function () { removeRow(btnId); };

cell3.appendChild(element3);

} else {

alert('You can add ' + listCount + ' charity-donation details only!');

}

function removeRow(btnDelete) {

var table = document.getElementById('dataTable');

var rowCount = table.rows.length;

for (var i = 0; i < rowCount; i++) {

var row = table.rows[i];

var rowObj = row.cells[2].childNodes[0];

if (rowObj.id == btnDelete) {

table.deleteRow(i);

rowCount--;

}

function saveDetail() {

var table = document.getElementById('dataTable');

var rowCount = table.rows.length;

var rowState = "";

if (rowCount > 1) {

for (var i = 1; i <= rowCount; i++) {

var row = table.rows[i];

var charitySelect = row.cells[0].childNodes[0];

var donationAmount = row.cells[1].childNodes[0];

if (donationAmount.value == "0") {

alert("Donation amount should be greater than 0");

donationAmount.focus();

break;

}

var isValidRegex = /^\d+$/;

if (!isValidRegex.test(donationAmount.value)) {

alert("Donation amount should be a digit value");

donationAmount.focus();

break;

}

rowState = rowState + charitySelect.value + "," + donationAmount.value + ":";

document.getElementById('hdnTableState').value = rowState;

}

} else {

alert('No record present!');

}

</script>

</head>

<body>

<tr>

<th>

Charity

</th>

<th>

Donation Amount

</th>

<th>

Action

</th>

</tr>

</table>

</body>

</html>

Sunday, March 26, 2017

Difference between SingleOrDefault() n FirstOrDefault()

Whenever you use SingleOrDefault, you clearly state that the query should result in at most a single result. On the other hand, when FirstOrDefault is used, the query can return any amount of results but you state that you only want the first one.

I personally find the semantics very different and using the appropriate one, depending on the expected results, improves readability.