This code recursively searches up the DOM of the parent element of the input element to find the table element.

// 通過 HTML 表格標(biāo)簽過濾父元素
$('.item :first :input[name="code"]').parents('table')

// 條件判斷，未找到父表格元素
($('.item :first :input[name="code"]').parents('table').length == 0)

If found, length returns 1; if not found, return 0.

FAQ for jQuery and HTML forms (FAQ)

How to use jQuery to check if an HTML table exists?

To use jQuery to check whether an HTML table exists, you can use the length attribute. length attribute returns the number of elements that match the specified selector. Here is a simple example:

if ($("table").length) {
  // 表格存在
} else {
  // 表格不存在
}

In this code, $("table") is a jQuery selector that selects all table elements. If the value returned by the length attribute is greater than 0, it means at least one table exists.

How to use jQuery to select specific cells in HTML table?

You can use the :eq() selector of jQuery's :eq() selector.

The selector selects an element with a specific index number. The index number starts at 0. Here is an example:

$("table tr:eq(1) td:eq(2)").html();

$("table tr:eq(1) td:eq(2)")In this code, html() selects the cell in the second row and third column of the table. Then, the

method gets the HTML content of this cell.

How to add a row to an HTML table using jQuery?

append()You can add a row to an HTML table using the append() method of jQuery. The

method inserts the specified content at the end of the selected element. Here is an example:

$("table").append("<tr><td>新行</td></tr>");

$("table").append("新行")In this code,

adds a new row containing a cell to the end of the table.

How to use jQuery to delete a row from an HTML table?

remove() You can use jQuery's remove() method to delete a row from an HTML table.

Method deletes the selected element and its children. Here is an example:

$("table tr:eq(1)").remove();

$("table tr:eq(1)").remove()In this code,

deletes the second row in the table.

How to use jQuery to modify the content of cells in an HTML table?

html()You can use the html() method of jQuery to modify the content of cells in an HTML table.

Method sets or returns the content of the selected element (innerHTML). Here is an example:

$("table tr:eq(1) td:eq(2)").html("新內(nèi)容");

$("table tr:eq(1) td:eq(2)").html("新內(nèi)容")In this code,

changes the contents of the cell in the second row and third column of the table to "New Content".

How to use jQuery to select all cells in a column in an HTML table?

:nth-child()You can use the :nth-child() selector of jQuery to select all cells in a column in an HTML table.

The selector selects all elements of the nth child element of its parent element. Here is an example:

// 通過 HTML 表格標(biāo)簽過濾父元素
$('.item :first :input[name="code"]').parents('table')

// 條件判斷，未找到父表格元素
($('.item :first :input[name="code"]').parents('table').length == 0)

In this code, $("table td:nth-child(2)") selects all cells in the second column of the table.

How to use jQuery to hide a column of an HTML table?

You can use the hide() method of jQuery to hide a column of an HTML table. hide() method hides selected elements. Here is an example:

if ($("table").length) {
  // 表格存在
} else {
  // 表格不存在
}

In this code, $("table td:nth-child(2)").hide() hides all cells in the second column in the table.

How to use jQuery to display a hidden column in an HTML table?

You can use the show() method of jQuery to display a hidden column in an HTML table. show() method displays the selected element. Here is an example:

$("table tr:eq(1) td:eq(2)").html();

In this code, $("table td:nth-child(2)").show() displays all cells in the second column in the table.

How to use jQuery to select all rows in an HTML table?

You can use the jQuery selector $("table tr") to select all rows in an HTML table. This selector selects all row elements in the table. Here is an example:

$("table").append("<tr><td>新行</td></tr>");

In this code, $("table tr") selects all rows in the table.

How to use jQuery to count the number of rows in an HTML table?

You can use the length attribute of jQuery to count the number of rows in the HTML table. length attribute returns the number of elements that match the specified selector. Here is an example:

$("table tr:eq(1)").remove();

In this code, $("table tr").length returns the number of rows in the table, and this value is stored in the rowCount variable.

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