From: &lt;http://jinja.pocoo.org/docs/templates/#include&gt;


template.html

```html
{% include &#39;banner.html&#39; %}
{% include &#39;sidenavigation.html&#39; %}
{% include &#39;content.html&#39; %}
{% include &#39;footer.html&#39; %}
```

By default, Flask uses Jinja2 as its template engine. See Jinja&#39;s [Template Designer Documentation][1] how it&#39;s done.


  [1]: http://jinja.pocoo.org/docs/templates/

Before you start, you need to write these components separately to other html files as pure html. For example, these files shouldn&#39;t contain any jinja syntax. After that, according to the [documentation][1], you can easily import them into your template.html file by calling `{% include &#39;filename.html&#39; %}` code.


  [1]: https://jinja.palletsprojects.com/en/3.0.x/templates/#include

I have a class

    class Person
        attr_accessor :name,:age
        def initialize(name,age)
            @name = name
            @age = age
        end
    end

I&#39;d like to make the age optional so its 0 if its not passed, or the name to be blank if not passed

Ive researched a bit on it but its a bit confusing as to what i&#39;ve found (having to pass variables in another variable { }).

Rails optional argument

I have a question about how to set the texture by `glUniform1i`. I have seen code like below.

    glActiveTexture(GL_TEXTURE0); 
    glBindTexture(GL_TEXTURE_2D, texture0);
    glUniform1i(_textureUniform, 0);
    glActiveTexture(GL_TEXTURE1); 
    glBindTexture(GL_TEXTURE_2D, texture1);
    glUniform1i(_textureUniform, 1);

Does it mean, if I use the number `i` in the `glUniform1i`, then I have to use `glActiveTexture(GL_TEXTURE **i** )`?

set the texture for by glUniform1i

Say I have a template layout saved in template.html.  This template includes a banner, side navigation, content container, and footer. Can I use flask to break up these page elements in such a way that I can have files such as banner.html, sidenavigation.html, etc. and render these different files within template.html?

Is it possible to perform Includes with flask?

<p>Say I have a template layout saved in template.html.  This template includes a banner, side navigation, content container, and footer. Can I use flask to break up these page elements in such a way that I can have files such as banner.html, sidenavigation.html, etc. and render these different files within template.html?</p>


![enter image description here][1]


  [1]: http://i.stack.imgur.com/fmksR.gif

How would i get my cursor to change to this loading icon when a function is called and how would i change it back to a normal cursor in javascript/jquery

Changing cursor to waiting in javascript/jquery

I have very basic and known scenario of form where I need to align labels next to inputs correctly. However I don&#39;t know how to do it.

My goal would be that labels are aligned next to inputs to the right side. Here is picture example of desired result.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/0vfJu.png

I have made a fiddle for your convenience and to clarify what I have now - http://jsfiddle.net/WX58z/

Snippet:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;block&quot;&gt;
        &lt;label&gt;Simple label&lt;/label&gt;
        &lt;input type=&quot;text&quot; /&gt;
    &lt;/div&gt;
    &lt;div class=&quot;block&quot;&gt;
        &lt;label&gt;Label with more text&lt;/label&gt;
        &lt;input type=&quot;text&quot; /&gt;
    &lt;/div&gt;
    &lt;div class=&quot;block&quot;&gt;
        &lt;label&gt;Short&lt;/label&gt;
        &lt;input type=&quot;text&quot; /&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;



Align labels in form next to input

I have a web app where if a user clicks on a link it should open up a map. The best solution that I can think of is to open up a new tab/window to google maps using the `target=&quot;_blank&quot;` attribute.

But I think that **it would be best to open up the device&#39;s map app** instead of google map.

I know that you can have the user&#39;s phone app to pop when the user clicks on a phone number with the href attribute pointing to `tel:&lt;the phone number&gt;`. I am wondering if this is also possible with the map app.

Is there a way to allow an anchor tag to open the mobile device&#39;s map app when the user clicks it?

How to open a mobile device&#39;s map app when a user clicks on a link?

I am trying to display some JavaScript variable on my HTML page. 

I was first using `document.write()` but it use to overwrite the current page when the function was called. 

After searching around, the general consensus was that `document.write()` isn&#39;t liked very much. What are the other options? 

I found a page suggesting using `.innerHTML` but that was written in 2005. 

A jsFiddle illustrating my problem http://jsfiddle.net/xHk5g/

How to display JavaScript variables in a HTML page without document.write

I see this character in Firebug `&amp;#65279;`.

I don&#39;t know why this is happening, there&#39;s no such character in my code. For Firefox it&#39;s OK, but in IE everything breaks. I can&#39;t even search for this character in Google. 

I saved my file with utf-8 encoding without bom. 
 

![enter image description here][1]


  [1]: http://i.stack.imgur.com/85qXd.png

Why is &amp;#65279; appearing in my HTML?

I am trying to do the following:

    template &lt;class T&gt;
    std::ifstream&amp; operator&gt;&gt; (std::ifstream&amp; fin, List&lt;T&gt; l)
    {
        T temp;
        l.resize(0);
        fin &gt;&gt; ignore(1,&#39;\t&#39;);
        for(ListIterator&lt;T&gt; i=l.begin();i!=l.end();i++)
        {
            fin &gt;&gt; ignore(1,&#39;\t&#39;) &gt;&gt; temp;
            l.push_back(temp);
        }
        return fin;
    }

I have to read all the contents from a file. Each field is separated by `&#39;\t&#39;` character, so I have to ignore the `&#39;\t&#39;` characters.

The error log is the following:


    /home/ramy/Documents/C++/Prova/Util.h||In function ‘std::ifstream&amp; Util::operator&gt;&gt; (std::ifstream&amp;, Util::List&lt;T&gt;)’:|
    /home/ramy/Documents/C++/Prova/Util.h|431|error: there are no arguments to ‘ignore’ that  depend on a template parameter, so a declaration of ‘ignore’ must be available|
    /home/ramy/Documents/C++/Prova/Util.h|431|note: (if you use ‘-fpermissive’, G++ will  accept your code, but allowing the use of an undeclared name is deprecated)|
    ||=== Build finished: 1 errors, 0 warnings ===|


There are no arguments that depend on a template parameter

When I define this function,

    template&lt;class A&gt;
    set&lt;A&gt; test(const set&lt;A&gt;&amp; input) {
    	return input;
    }

I can call it using `test(mySet)` elsewhere in the code without having to explicitly define the template type. However, when I use the following function:

    template&lt;class A&gt;
    set&lt;A&gt; filter(const set&lt;A&gt;&amp; input,function&lt;bool(A)&gt; compare) {
    	set&lt;A&gt; ret;
    	for(auto it = input.begin(); it != input.end(); it++) {
    		if(compare(*it)) {
    			ret.insert(*it);
    		}
    	}
    	return ret;
    }

When I call this function using `filter(mySet,[](int i) { return i%2==0; });`
I get the following error:

&gt; error: no matching function for call to ‘filter(std::set&lt;int&gt;&amp;, main()::&lt;lambda(int)&gt;)’

However, all of these versions *do* work:

    std::function&lt;bool(int)&gt; func = [](int i) { return i%2 ==0; };
    set&lt;int&gt; myNewSet = filter(mySet,func);

    set&lt;int&gt; myNewSet = filter&lt;int&gt;(mySet,[](int i) { return i%2==0; });

    set&lt;int&gt; myNewSet = filter(mySet,function&lt;bool(int)&gt;([](int i){return i%2==0;}));

Why is c++11 unable to guess the template type when I put the lambda function directly inside the expression without directly creating a `std::function`?

**EDIT:**

Per advice of Luc Danton in the comments, here is an alternative to the function I had earlier that does not need the templates to be passed explicitly.

    template&lt;class A,class CompareFunction&gt;
    set&lt;A&gt; filter(const set&lt;A&gt;&amp; input,CompareFunction compare) {
    	set&lt;A&gt; ret;
    	for(auto it = input.begin(); it != input.end(); it++) {
    		if(compare(*it)) {
    			ret.insert(*it);
    		}
    	}
    	return ret;
    }

This can be called by `set&lt;int&gt; result = filter(myIntSet,[](int i) { i % 2 == 0; });` without needing the template.

The compiler can even guess the return types to some extent, using the new decltype keyword and using the new function return type syntax. Here is an example that converts a set to a map, using one filtering function and one function that generates the keys based on the values:

    template&lt;class Value,class CompareType,class IndexType&gt;
    auto filter(const set&lt;Value&gt;&amp; input,CompareType compare,IndexType index) -&gt; map&lt;decltype(index(*(input.begin()))),Value&gt; {
    	map&lt;decltype(index(*(input.begin()))),Value&gt; ret;
    	for(auto it = input.begin(); it != input.end(); it++) {
    		if(compare(*it)) {
    			ret[index(*it)] = *it;
    		}
    	}
    	return ret;
    }

It can also be called without using the template directly, as

    map&lt;string,int&gt; s = filter(myIntSet,[](int i) { return i%2==0; },[](int i) { return toString(i); });

C++11 does not deduce type when std::function or lambda functions are involved

I&#39;ve been experimenting with Meteor and ran into something I couldn&#39;t figure out. For fun, I was trying to make a slot machine. I had the following HTML:
 
    &lt;div class=&quot;slot-wrapper&quot;&gt;
      {{&gt; slot}}
      {{&gt; slot}}
      {{&gt; slot}}
    &lt;/div&gt;

    &lt;template name=&quot;slot&quot;&gt;
      &lt;div class=&quot;slot&quot;&gt;
        &lt;div class=&quot;number&quot;&gt;&lt;span&gt;{{ number }}&lt;/span&gt;&lt;/div&gt;
        &lt;div class=&quot;divider&quot;&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/template&gt;

I want to have a different number for each slot. Is it possible to pass variables into template? Something like this:

    &lt;div class=&quot;slot-wrapper&quot;&gt;
      {{&gt; slot 1}}
      {{&gt; slot 2}}
      {{&gt; slot 3}}
    &lt;/div&gt;
    
    &lt;template name=&quot;slot&quot;&gt;
      &lt;div class=&quot;slot&quot;&gt;
        &lt;div class=&quot;number&quot;&gt;&lt;span&gt;{{ number i}}&lt;/span&gt;&lt;/div&gt;
        &lt;div class=&quot;divider&quot;&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/template&gt;

Maybe I&#39;m thinking about this the wrong way and there&#39;s a better way.

Is there a way to pass variables into templates in Meteor?

I&#39;m using [Grunt][1] (task-based command line build tool for JavaScript projects) in my project. I&#39;ve created a custom tag and I am wondering if it is possible to run a command into it.

To clarify, I&#39;m trying to use Closure Templates and &quot;the task&quot; should call the jar file to pre-compile the Soy file to a javascript file.

I&#39;m running this jar from command line, but I want to set it as a task.



  [1]: https://github.com/cowboy/grunt

Running a command in a Grunt Task

Since templates are defined within headers and compiler is able to determine if inlining a function is advantageous, does it make any sense? I&#39;ve heard that modern compilers know better when to inline a function and are ignoring `inline` hint.

---
edit: I would like to accept both answers, but this is not possible. To close the issue I am accepting **Sebastian Mach**&#39;s answer, because it received most votes and he is formally right, but as I mentioned in comments I consider **Puppy**&#39;s and **Component 10**&#39;s answers as correct ones too, from different point of view.

The problem is in C++ semantics, which is not strict in case of `inline` keyword and inlining. **Sebastian Mach** says &quot;write inline if you mean it&quot;, but what is actually meant by `inline` is not clear as it evolved from its original meaning to a directive that &quot;stops compilers bitching about ODR violations&quot; as **Puppy** says.

Does it make any sense to use inline keyword with templates?

I want to structure my Flask app something like:

    ./site.py
    ./apps/members/__init__.py
    ./apps/members/models.py

`apps.members` is a Flask Blueprint.

Now, in order to create the model classes I need to have a hold of the app, something like:

    # apps.members.models
    from flask import current_app
    from flaskext.sqlalchemy import SQLAlchemy

    db = SQLAlchemy(current_app)

    class Member(db.Model):
        # fields here
        pass

But if I try and import that model into my Blueprint app, I get the dreaded `RuntimeError: working outside of request context`. How can I get a hold of my app correctly here? Relative imports might work but they&#39;re pretty ugly and have their own context issues, e.g:

    from ...site import app

    # ValueError: Attempted relative import beyond toplevel package

    

Flask-SQLAlchemy import/context issue

I&#39;m trying to get access to the user agent with Flask, but I either can&#39;t find the documentation on it, or it doesn&#39;t tell me.

How do I get the user agent with Flask?

I am trying to start a new thread in Python inside of a Flask application.  I am doing background work that gets triggered by the request, but I don&#39;t need to wait for the work to be done to respond to the request.

Is it possible to set the flask request in this sub-threat to the request that came in? Reason being, our ACL on our queries to our DB (mongoengine in front of mongoDB) relies on the request&#39;s user (it grabs it from flask&#39;s request object) to see if they have access to the objects, and its blowing up because the request is not available in the sub-thread.

Any thoughts would be much appreciated.

Here&#39;s pseudo code of how I am handling it now, but it is not working.

    @app.route(&#39;/my_endpoint&#39;, methods=[&#39;POST&#39;])
    def my_endpoint_handler():
        #do tracking in sub-thread so we don&#39;t hold up the page
        def handle_sub_view(req):
            from flask import request
            request = req
            # Do Expensive work
        thread.start_new_thread(handle_sub_view, (request))
        return &quot;Thanks&quot;



Flask throwing &#39;working outside of request context&#39; when starting sub thread

I want to be able to get the data sent to my Flask app. I&#39;ve tried accessing `request.data` but it is an empty string. How do you access request data?
    
```python
from flask import request

@app.route(&#39;/&#39;, methods=[&#39;GET&#39;, &#39;POST&#39;])
def parse_request():
    data = request.data  # data is empty
    # need posted data here
```

---

The answer to this question led me to ask https://stackoverflow.com/q/10999990 next, which is about getting the raw data rather than the parsed data.

Get the data received in a Flask request

I&#39;m building an app with Flask, but I don&#39;t know much about WSGI and it&#39;s HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests?

I do mean concurrent requests, and not requests per second or anything else.

How many concurrent requests does a single Flask process receive?

I need to check if the variable `texts` is defined or not in `index.html`. 

If the variable is defined and not empty then I should render the loop. Otherwise, I want to show the error message `{{error}}`.

Basically this in PHP

    if (isset($texts) &amp;&amp; !empty($texts)) {
        for () { ... }
    }
    else {
        print $error;
    }



**index.html**

    {% for text in texts %} 
    	&lt;div&gt;{{error}}&lt;/div&gt;
    	&lt;div class=&quot;post&quot;&gt;
    		&lt;div class=&quot;post-title&quot;&gt;{{text.subject}}&lt;/div&gt;
    		&lt;pre class=&quot;post-content&quot;&gt;{{text.content}}&lt;/pre&gt;
    	&lt;/div&gt;
    {% endfor %}

How do I say this in jinja2?

Check if an array is not empty in Jinja2

How do I persuade Jinja2 to not print `&quot;None&quot;` when the value is `None`?

I have a number of entries in a dictionary and I would like to output everything in a single loop instead of having special cases for different keywords.  If I have a value of `None` (the `NoneType` not the string) then the string `&quot;None&quot;` is inserted into the template rendering results.

Trying to suppress it using 
`{{ value or &#39;&#39; }}` works too well as it will replace the numeric value zero as well.

Do I need to filter the dictionary before passing it to Jinja2 for rendering?



Suppress &quot;None&quot; output as string in Jinja2

My app makes a call to an API that returns a  dictionary. I want to pass information from this dict to JavaScript in the view. I am using the Google Maps API in the JS, specifically, so I&#39;d like to pass it a list of tuples with the long/lat information. I know that `render_template` will pass these variables to the view so they can be used in HTML, but how could I pass them to JavaScript in the template? 

    from flask import Flask
    from flask import render_template

    app = Flask(__name__)

    import foo_api

    api = foo_api.API(&#39;API KEY&#39;)

    @app.route(&#39;/&#39;)
    def get_data():
        events = api.call(get_event, arg0, arg1)
        geocode = event[&#39;latitude&#39;], event[&#39;longitude&#39;]
        return render_template(&#39;get_data.html&#39;, geocode=geocode)

How can I pass data from Flask to JavaScript in a template?

I am using Flask/Jinja2 template to show a number using **|float** filter.

Here is my code

    {% set proc_err = nb_err|length / sum * 100 %}
    ({{proc_err|float}}%)

Output is a bit awkward:

    17/189 (8.99470899471%)

I am looking for a way to make the places after dot limited to a number e.g. 2.

Desired output:

    17/189 (8.99%)

How to use float filter to show just two digits after decimal point?

I have a jinja2 template (.html file) that I want to render (replace the tokens with values from my py file).  Instead of sending the rendered result to a browser, however, I want to write it to a new .html file.  I would imagine the solution would also be similar for a django template.

How can I do this?

Content Type	Original Author	Original Content on Stackoverflow
Question	Michael	View Question on Stackoverflow
Solution 1 - Html	Liyan Chang	View Answer on Stackoverflow
Solution 2 - Html	plaes	View Answer on Stackoverflow
Solution 3 - Html	ned	View Answer on Stackoverflow

Is it possible to perform Includes with flask?

Html Problem Overview

Html Solutions

Solution 1 - Html

Solution 2 - Html

Solution 3 - Html

set the texture for by glUniform1i

Rails optional argument

Attributions