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All the child elements of the div of id="root" are accessed and assigned to a variable $nodes. We display the length of the collection of child nodes using the alert statement. Thereafter, with the help of the each() method, we access all the elements stored in $nodes one at a time. We use the text() method and access and concatenate the text of the elements in a string variable $txt. At the end, the text of all the children is displayed via another alert() method. Let us look at the methods used in the preceding jQuery code one by one.
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CHAPTER 1 JQUERY BASICS
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children()
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The children() method is a tree-traversal method that searches for the immediate children of the specified element and returns a new jQuery object. This method travels only a single level down in the DOM tree. In our example, this method accesses all the DOM nodes defined in the root div element and assigns them to the variable $nodes. $nodes is a jQuery object that contains the three div elements defined in the root div element. Using the $nodes object's length attribute, we first display the count of the number of DOM nodes in the HTML file.
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each()
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each() is a method that is used to iterate over each element in the wrapped collection. It contains an iterator function in which we write the code to be applied to each individual element of the collection.
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text()
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text() is a method of the jQuery object that accesses the text contents of the selected element(s). The text contents of the selected element(s) are combined and returned in the form of a string. To see the text contents of a paragraph element, we may write following jQuery code: alert($('p').text()); Let s assume that the paragraph element appears as shown in the following example: <p>Styles make the formatting job much easier and more efficient. To give an attractive look to web sites, styles are heavily used. <span>jQuery is a powerful JavaScript library that allows us to add dynamic elements to our web sites. </span>Not only is it easy to learn, but it's easy to implement too.<br> <a href="a1.htm"> jQuery Selectors</a> are used for selecting the area of the document where we want to apply styles </p> The preceding jQuery code will display the output as shown in Figure 1-1.
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Figure 1-1. The text content of the paragaph element of an HTML file
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CHAPTER 1 JQUERY BASICS
We can see the text contents of the children of a paragraph element by using the following statement: $(document).ready(function() { alert($('p').children().text()); });
parent()
The parent() method is a tree-traversal method that searches for the immediate parent of each of the selected elements and returns a new jQuery object. This method travels only a single level up in the DOM tree. To get the text content of the parent of the span element, we may use the following jQuery code: alert($('span').parent().text());
1-7. Obtaining the HTML of an Element
Problem
You want to see the HTML code of the selected element(s).
Solution
First assume that the HTML file contains the paragraph element as shown in the following example: <p>Styles make the formatting job much easier and more efficient. To give an attractive look to web sites, styles are heavily used. <span>jQuery is a powerful JavaScript library that allows us to add dynamic elements to our web sites. </span>Not only is it easy to learn, but it's easy to implement too.<br> <a href="a1.htm"> jQuery Selectors</a> are used for selecting the area of the document where we want to apply styles </p> The jQuery code to display the HTML code of the paragraph element appears as follows: $(document).ready(function() { alert($('p').html()); });
How It Works
The contents of the paragraph element are accessed and with the help of the html() method, and its HTML code is displayed. The html() method gets the HTML content of the first element of the selected elements. It returns the HTML contents in the form of a string. The difference between html() and text() is that the text() method can be used in XML as well as in HTML documents, whereas html() can
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