"ഫലകം:If empty/doc" എന്ന താളിന്റെ പതിപ്പുകൾ തമ്മിലുള്ള വ്യത്യാസം

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00:41, 11 ജൂലൈ 2014-നു നിലവിലുണ്ടായിരുന്ന രൂപം

This is a documentation subpage for ഫലകം:If empty.
It may contain usage information, categories and other content that is not part of the original ഫലകം page.

This template is used on 36,20,000+ pages, or roughly 693% of all pages.
To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

This is the {{if empty}} template.

This template is used inside other templates. It takes up to nine parameters (parameters 1-9), and returns the first one that is defined and non-empty, otherwise nothing. Typical usage is like this:

{{if empty| {{{logo|}}} | {{{image|}}} | default.svg }}

This returns the first of the parameters logo and image that is defined and non-empty, otherwise "default.svg".

Background

The MediaWiki parameter default function doesn't return the default value for empty parameters. That is, {{{logo|default.svg}}} does not return "default.svg" if the template was called like this: {{template|logo=}}.

The usual workaround is to do like this:

{{#if:{{{logo|}}}| {{{logo}}} | default.svg }}

But this becomes complex when you want to check several parameters:

{{#if:{{{logo|}}}| {{{logo}}} | {{#if:{{{image|}}} | {{{image}}} | default.svg }}}}

Then it is easier to use this template instead:

{{if empty| {{{logo|}}} | {{{image|}}} | default.svg }}

Note! The parameters to {{if empty}} must use the pipe "|", like this: {{{logo|}}}. Or else {{if empty}} will be fed and return the string "{{{logo}}}" if logo was not defined.

Examples

Code	Result	Comment
`{{if empty}}`		Returns an empty string.
`{{if empty\|one}}`	one	Returns the first parameter that is defined and not empty.
`{{if empty\|one\|two}}`	one
`{{if empty\|one\|two\|three\|four}}`	one
`{{if empty\|two}}`	two	The first parameter was empty or undefined, so uses the next parameter.
`{{if empty\|two\|three\|four}}`	two
`{{if empty\|two\|four}}`	two
`{{if empty\|\|\|\|\|\|\|\|\|nine}}`	nine
`{{if empty\|\|\|\|\|\|\|\|\|\|ten}}`	ten	Only handles up to nine parameters, so returns an empty string.
`{{if empty}}`		The only parameter is empty or undefined, so returns an empty string.
`{{if empty}}`		Returns an empty string.
`{{if empty\|{{{1\|}}}\|{{{2\|}}}\|three}}`	three
`{{if empty\|{{{1}}}\|{{{2}}}\|three}}`	{{{1}}}	Returns the text "{{{1}}}", because it is a non-empty string. Note the lack of "\|" in the first two parameters.
`{{if empty\|{{{logo\|}}}\|two}}`	two
`{{if empty\|{{{logo}}}\|two}}`	{{{logo}}}	Returns the text "{{{logo}}}", because it is a non-empty string. Note the lack of "\|" in the first parameter.
`{{if empty\|2=x}}`		Whether parameter 1 is undefined or empty does not matter.
`{{if empty\|p=q}}`		The template checks its parameters 1-9, not other ones.

@@ വരി 3: / വരി 3: @@
 <!-- PLEASE ADD CATEGORIES AND INTERWIKIS AT THE BOTTOM OF THIS PAGE -->
-This is the {{tl|ifempty}} template.
+This is the {{tl|if empty}} template.
 This template is used inside other templates. It takes up to nine parameters (parameters 1-9), and returns the first one that is defined and non-empty, otherwise nothing. Typical usage is like this:
-:<code><nowiki>{{ifempty| {{{logo|}}} | {{{image|}}} | default.svg }}</nowiki></code>
+:<code><nowiki>{{if empty| {{{logo|}}} | {{{image|}}} | default.svg }}</nowiki></code>
 This returns the first of the parameters ''logo'' and ''image'' that is defined and non-empty, otherwise "default.svg".
@@ വരി 23: / വരി 23: @@
 Then it is easier to use this template instead:
-:<code><nowiki>{{ifempty| {{{logo|}}} | {{{image|}}} | default.svg }}</nowiki></code>
+:<code><nowiki>{{if empty| {{{logo|}}} | {{{image|}}} | default.svg }}</nowiki></code>
-'''Note!''' The parameters to {{tlf|ifempty}} must use the pipe "|", like this: <code><nowiki>{{{logo|}}}</nowiki></code>. Or else {{tlf|ifempty}} will be fed and return the string "<code><nowiki>{{{logo}}}</nowiki></code>" if ''logo'' was not defined.
+'''Note!''' The parameters to {{tlf|if empty}} must use the pipe "|", like this: <code><nowiki>{{{logo|}}}</nowiki></code>. Or else {{tlf|if empty}} will be fed and return the string "<code><nowiki>{{{logo}}}</nowiki></code>" if ''logo'' was not defined.
 === Examples ===
@@ വരി 31: / വരി 31: @@
 <table class="wikitable">
 <tr><th>Code<th>Result<th>Comment
-<tr><td>{{tlc|ifempty}} <td>{{ifempty}} <td>Returns an empty string.
+<tr><td>{{tlc|if empty}} <td>{{if empty}} <td>Returns an empty string.
-<tr><td>{{tlc|ifempty|one}} <td>{{ifempty|one}} <td>Returns the first parameter that is defined and not empty.
+<tr><td>{{tlc|if empty|one}} <td>{{if empty|one}} <td>Returns the first parameter that is defined and not empty.
-<tr><td>{{tlc|ifempty|one|two}} <td>{{ifempty|one|two}} <td>
+<tr><td>{{tlc|if empty|one|two}} <td>{{if empty|one|two}} <td>
-<tr><td>{{tlc|ifempty|one|two|three|four}} <td>{{ifempty|one|two|three|four}} <td>
+<tr><td>{{tlc|if empty|one|two|three|four}} <td>{{if empty|one|two|three|four}} <td>
-<tr><td>{{tlc|ifempty||two}} <td>{{ifempty||two}} <td>The first parameter was empty or undefined, so uses the next parameter.
+<tr><td>{{tlc|if empty||two}} <td>{{if empty||two}} <td>The first parameter was empty or undefined, so uses the next parameter.
-<tr><td>{{tlc|ifempty||two|three|four}} <td>{{ifempty||two|three|four}} <td>
+<tr><td>{{tlc|if empty||two|three|four}} <td>{{if empty||two|three|four}} <td>
-<tr><td>{{tlc|ifempty||two||four}} <td>{{ifempty||two||four}} <td>
+<tr><td>{{tlc|if empty||two||four}} <td>{{if empty||two||four}} <td>
-<tr><td><code><nowiki>{{ifempty|||||||||nine}}</nowiki></code> <td>{{ifempty|||||||||nine}} <td>
+<tr><td><code><nowiki>{{if empty|||||||||nine}}</nowiki></code> <td>{{if empty|||||||||nine}} <td>
-<tr><td><code><nowiki>{{ifempty||||||||||ten}}</nowiki></code> <td>{{ifempty||||||||||ten}} <td>Only handles up to nine parameters, so returns an empty string.
+<tr><td><code><nowiki>{{if empty||||||||||ten}}</nowiki></code> <td>{{if empty||||||||||ten}} <td>Only handles up to nine parameters, so returns an empty string.
-<tr><td>{{tlc|ifempty|}} <td>{{ifempty|}} <td>The only parameter is empty or undefined, so returns an empty string.
+<tr><td>{{tlc|if empty|}} <td>{{if empty|}} <td>The only parameter is empty or undefined, so returns an empty string.
-<tr><td>{{tlc|ifempty||||}} <td>{{ifempty||||}} <td>Returns an empty string.
+<tr><td>{{tlc|if empty||||}} <td>{{if empty||||}} <td>Returns an empty string.
-<tr><td><code><nowiki>{{ifempty|{{{1|}}}|{{{2|}}}|three}}</nowiki></code> <td>{{ifempty|{{{1|}}}|{{{2|}}}|three}} <td>
+<tr><td><code><nowiki>{{if empty|{{{1|}}}|{{{2|}}}|three}}</nowiki></code> <td>{{if empty|{{{1|}}}|{{{2|}}}|three}} <td>
-<tr><td><code><nowiki>{{ifempty|{{{1}}}|{{{2}}}|three}}</nowiki></code> <td>{{ifempty|{{{1}}}|{{{2}}}|three}} <td>Returns the text "{{{1}}}", because it is a non-empty string. Note the lack of "|" in the first two parameters.
+<tr><td><code><nowiki>{{if empty|{{{1}}}|{{{2}}}|three}}</nowiki></code> <td>{{if empty|{{{1}}}|{{{2}}}|three}} <td>Returns the text "{{{1}}}", because it is a non-empty string. Note the lack of "|" in the first two parameters.
-<tr><td><code><nowiki>{{ifempty|{{{logo|}}}|two}}</nowiki></code> <td>{{ifempty|{{{logo|}}}|two}} <td>
+<tr><td><code><nowiki>{{if empty|{{{logo|}}}|two}}</nowiki></code> <td>{{if empty|{{{logo|}}}|two}} <td>
-<tr><td><code><nowiki>{{ifempty|{{{logo}}}|two}}</nowiki></code> <td>{{ifempty|{{{logo}}}|two}} <td>Returns the text "{{{logo}}}", because it is a non-empty string. Note the lack of "|" in the first parameter.
+<tr><td><code><nowiki>{{if empty|{{{logo}}}|two}}</nowiki></code> <td>{{if empty|{{{logo}}}|two}} <td>Returns the text "{{{logo}}}", because it is a non-empty string. Note the lack of "|" in the first parameter.
-<tr><td><code><nowiki>{{ifempty|2=x}}</nowiki></code> <td>{{ifempty|2=x}} <td>Whether parameter 1 is undefined or empty does not matter.
+<tr><td><code><nowiki>{{if empty|2=x}}</nowiki></code> <td>{{if empty|2=x}} <td>Whether parameter 1 is undefined or empty does not matter.
-<tr><td><code><nowiki>{{ifempty|p=q}}</nowiki></code> <td>{{ifempty|p=q}} <td>The template checks its parameters 1-9, not other ones.
+<tr><td><code><nowiki>{{if empty|p=q}}</nowiki></code> <td>{{if empty|p=q}} <td>The template checks its parameters 1-9, not other ones.
 </table>

00:41, 11 ജൂലൈ 2014-നു നിലവിലുണ്ടായിരുന്ന രൂപം

Background

Examples

See also