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Groups > comp.lang.javascript > #23245
| From | Joao Rodrigues <groups_jr-1@yahoo.com.br> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: Get inner text of HMTL element |
| Date | 2014-02-23 15:29 -0300 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <ledela$afm$1@speranza.aioe.org> (permalink) |
| References | <leambb$nfo$1@dont-email.me> <lebfaf$8r8$1@speranza.aioe.org> <lebtqq$3st$1@dont-email.me> |
On 23-02-2014 01:35, se wrote:
> "Joao Rodrigues" <groups_jr-1@yahoo.com.br> skrev i meddelelsen
> news:lebfaf$8r8$1@speranza.aioe.org...
>
>> A good approach is using feature-tests at load-time, when you test for
>> either textContent or innerText only once. Then, you will use one of
>> them in the rest of your code / library. E.g.
>>
>> (function (global) {
>> // feature-tests at load-time.
>> var parseEl = document.createElement('div');
>> var get_inner_text;
>> if (typeof parseEl.textContent != 'undefined') {
>> // DOM Level 3 - IE9+, FF, Safari, etc.
>> get_inner_text = function (el) {
>> return (el.textContent);
>> };
>> } else if (typeof parseEl.innerText != 'undefined') {
>> get_inner_text = function (el) {
>> return (el.innerText);
>> };
>> }
>> global.get_inner_text = get_inner_text;
>> }(this));
>>
>> Keep in mind the differences between textContent and innerText,
>> though. See https://developer.mozilla.org/En/DOM/Node.textContent
>
> Why this:
> if (typeof parseEl.textContent != 'undefined')
>
> Why not just:
> if (typeof parseEl.textContent)
No, because the typeof operator always returns an non-empty string. So
the if statement will evaluate the (typeof parseEl.textContent)
expression as true. You seem to be confusing "undefined" with undefined.
If ("undefined") { } // is true
If (undefined) { } // is false
See <http://ecma-international.org/ecma-262/5.1/#sec-11.4.3>
and
<http://ecma-international.org/ecma-262/5.1/#sec-12.5>
> Testing for returned value of either null or undefined, its
> anough and better just doing: if (ele)
> Using 'undefined' in testing often leads to an erroneous compare statment.
> if using != it would be better doing it like this: if (ele!=null). As
> null is a
> reliable use whether returned value is undefined or null.
> if (ele!=null) is the same as if (ele).
> So in cases where returned value is either undefined or null,
> just do: if (ele).
It is so because undefined == null and null == undefined are true and
also because the undefined value can be overwritten in ES 3. This is
whay it is safe to test against null.
--
Joao Rodrigues
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Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-22 18:21 +0100
Re: Get inner text of HMTL element Martin Honnen <mahotrash@yahoo.de> - 2014-02-22 19:31 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-22 20:51 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 21:11 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-22 21:37 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 22:05 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-22 23:38 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-23 10:43 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-23 14:50 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-23 15:48 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-24 21:01 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-24 22:34 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-27 21:41 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-27 22:32 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-28 13:44 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-28 16:54 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-04 20:51 +0100
Re: Get inner text of HMTL element ompalompasales2@gmail.com - 2014-03-04 12:59 -0800
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 20:59 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-22 22:23 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 23:32 +0100
Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-22 21:27 -0300
Re: Get inner text of HMTL element "se" <se@no-one.here> - 2014-02-23 05:35 +0100
Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-23 15:29 -0300
Re: Get inner text of HMTL element "se" <se@no-one.here> - 2014-02-23 21:01 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-23 20:02 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-23 21:55 +0100
Re: Get inner text of HMTL element Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-02-24 08:37 +0100
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-24 12:30 +0100
Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-24 15:09 -0300
Re: Get inner text of HMTL element Christoph Michael Becker <cmbecker69@arcor.de> - 2014-02-24 19:43 +0100
Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-24 18:12 -0300
Re: Get inner text of HMTL element Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-24 22:51 +0100
Re: Get inner text of HMTL element Dr J R Stockton <reply1400@merlyn.demon.co.uk.invalid> - 2014-02-25 19:49 +0000
Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-26 05:20 -0300
Re: Get inner text of HMTL element "se" <se@no-one.here> - 2014-02-26 17:10 +0100
OT - Re: Get inner text of HMTL element Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-26 15:48 -0300
Re: OT - Re: Get inner text of HMTL element "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-26 22:43 +0100
Re: OT - Re: Get inner text of HMTL element Dr J R Stockton <reply1400@merlyn.demon.co.uk.invalid> - 2014-02-27 15:00 +0000
Re: OT - Re: Get inner text of HMTL element "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-28 10:50 +0100
Re: OT - Re: Get inner text of HMTL element "se" <se@no-one.here> - 2014-02-27 10:57 +0100
Re: Get inner text of HMTL element Dr J R Stockton <reply1400@merlyn.demon.co.uk.invalid> - 2014-02-27 15:46 +0000
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