to select a string from textarea

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to select a string from textarea

 
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  #1
Jan 23rd, 2008
haii friends....
i want to select a particular string from textarea...i need it in javascript....
am using the tag <layout:textarea>
i did not need the whole ,but only a part...plzz help me...
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Re: to select a string from textarea

 
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Jan 23rd, 2008
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Originally Posted by ajithraj View Post
haii friends....
i want to select a particular string from textarea...i need it in javascript....
am using the tag <layout:textarea>
i did not need the whole ,but only a part...plzz help me...
What markup language are you using?

In HTML a text area is just <textarea>.

You'll need a reference to the DOM node representing the text area, example:

textarea HTML
JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. <textarea id="mytext">
  2. </textarea>

select whats inside the textarea with JS
JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. // get the textarea by its id
  2. var txt = document.getElementById('mytext');
  3. // theres the contents inside the textarea
  4. var value = txt.value;
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Re: to select a string from textarea

 
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  #3
Jan 23rd, 2008
btw: once you have the value of the string, you need to do some matching with regex or similar to get what you want out of the string.
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Re: to select a string from textarea

 
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Jan 24th, 2008
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Originally Posted by ajithraj View Post
haii friends....
i want to select a particular string from textarea...i need it in javascript....
am using the tag <layout:textarea>
i did not need the whole ,but only a part...plzz help me...
thankzzz....
am using struts framework and <layout:textarea> is provided in it..
it has no property like "id" (ie..<textarea id="">)....
its syntax is like this..
<layout:textarea property="' key=""></layout:textarea>

"property" is used to represent the textarea ....

and wht is ment by "getElementById"..plzzz help
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Re: to select a string from textarea

 
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Jan 24th, 2008
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Originally Posted by ajithraj View Post
thankzzz....
am using struts framework and <layout:textarea> is provided in it..
it has no property like "id" (ie..<textarea id="">)....
its syntax is like this..
<layout:textarea property="' key=""></layout:textarea>

"property" is used to represent the textarea ....

and wht is ment by "getElementById"..plzzz help
You'll need to find out how to render HTML attributes using struts.

-----

Re: getElementById

Once the HTML is rendered on the page, the browser will create a DOM (Document Object Model) representation of the HTML for programmatic access from JavaScript.

The DOM is a W3C specification that models XML data as Objects. It is quite simple. Take for example some XML:

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. <root>
  2.   <child1 id="child1_id">Im a child of root</child1>
  3.   <child2 id="child2_id">
  4.     <subchild1 id="subchild1_id">Im a child of child2</subchild1>
  5.   </child2>
  6. </root>

There are many ways to model this XML document. The model used in browsers is the DOM. So in JavaScript, if you have a reference to the XML Document you could traverse it and select elements (DOM nodes) as well as manipulate it.

If the XML document reference is: XMLDoc, then the root would be:

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. XMLDoc.documentElement;

<child1> would be:

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. XMLDoc.documentElement.firstChild

or

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  1. XMLDoc.documentElement.childNodes.item(0);

or

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. XMLDoc.documentElement.getElementsByTagName('child1').item(0);

or

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. XMLDoc.documentElement.getElementsById('child1_id');

(These are all example of DOM methods for selecting Nodes/Elements).

getElementsById('child1_id') selects the child Node/Element with the id attribute 'child1_id'.

In HTML, the DOM is already created by the browser and available through document object. So you can use document to select any HTML element using DOM methods.

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
  1. document.getElementById('any_id_in_the_html_document');
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Re: to select a string from textarea

 
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  #6
Jan 24th, 2008
kk thankzzz.....
is there any method in java like "selectionStart"
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Re: to select a string from textarea

 
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  #7
Jan 24th, 2008
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Originally Posted by ajithraj View Post
kk thankzzz.....
is there any method in java like "selectionStart"
Do you want to get the Text that the user has currently selected?
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Re: to select a string from textarea

 
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Jan 25th, 2008
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Originally Posted by digital-ether View Post
Do you want to get the Text that the user has currently selected?
yes......i need that....
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Re: to select a string from textarea

 
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Jan 25th, 2008
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Originally Posted by ajithraj View Post
yes......i need that....
See: http://www.quirksmode.org/dom/range_intro.html
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Re: to select a string from textarea

 
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Jan 28th, 2008
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Originally Posted by digital-ether View Post
See: http://www.quirksmode.org/dom/range_intro.html
thankzzzzzzz a lottt
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