I have this simple file hello.html and looks like this.
<!DOCTYPE html>
<html>
<head>
<style>
p { background:yellow; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div class="thediv">
</div>
</body>
</html>
I am using fs module to write to my file like this
var fs = require('fs');
var randomnumber = Math.floor((Math.random()*100393)+433334);
fs.createReadStream('test.txt').pipe(fs.createWriteStream(randomnumber+'.txt'));
fs.writeFile(randomnumber+".txt", "Lorem ipsum"+randomnumber, function(err) {
if(err) {
console.log(err);
} else {
console.log("The file was saved!");
}
});
console.log(randomnumber);
I want to write
<article>
<p> lorem ipsum </p>
</article>
to the div with the id thediv.Is the fs module used for this kind of thing or is there a module more suited for this task?.
I believe the only answer to get an HTML parser, parse the file into a DOM, make the adjustments and then save the DOM back to a file. Here's a question that answers where to find an HTML parser.
Related
I'm trying to create a dynamically included in an ejs page (using <%- include('partials/content') %>) on my node.js project.
Is there a way I can create a variable for the to-be-included page and change it on a button click?
Let's assume your partials/content file includes content like:
<h1>Lorem ipsum dolor sit amet</h1>
A file named partials/content2:
<h1>consectetur adipiscing elit<h1>
Your main template file would wrap the partials content by a <div> with the id result and include a script file where you select this <div> by using var $result = $('#result'); so you have it in a variable. Then you can register a click handler on your button. On click you request the wished template file and replace the content.
Main template:
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
</head>
<body>
<div id="result">
<%- include partials/content.ejs %>
</div>
<button id="change">change</button>
<script>
var $result = $('#result');
$('#change').click(function() {
$result.load('/content2');
});
</script>
</body>
</html>
Then you need a controller on the backend like:
app.get('/content2', function (req, res) {
res.render('partials/content2');
});
I'm using https://www.npmjs.com/package/html-pdf library which is based on Phantom JS which internally uses webkit. I'm pasting the dummy HTML & JS code(keep these files in 1 folder) and also attaching the output screenshot.
The issue I'm facing is that on windows the PDF is generated with some extra space at top(empty space above red) which I can't get rid of.
Here is a forum(outdated) discussing similar issues, https://groups.google.com/forum/#!topic/phantomjs/YQIyxLWhmr0 .
input.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<div id="pageHeader" style="border-style: solid;border-width: 2px;color:red;">
header <br/> header <br/> header <br/> header
</div>
<div id="pageContent" style="border-style: solid;border-width: 2px;color:green;">
<div>
body <br/> body <br/> body
</div>
</div>
JS
(You require path, fs, handlebars, html-pdf npm packages)
var path = require('path');
var fs = require('fs');
var handlebars = require('handlebars');
var pdf = require('html-pdf');
saveHtml();
function saveHtml() {
fs.readFile('input.html', 'utf-8', {
flag: 'w'
}, function(error, source) {
handlebars.registerHelper('custom_title', function(title) {
return title;
})
var template = handlebars.compile(source);
var data = {};
var html = template(data);
var options = {
'format': 'A4',
'base': "file://",
/* You can give more options like height, width, border */
};
pdf.create(html, options).toFile('./output.pdf', function(err, res) {
if (err) {
console.log('err pdf');
return;
} else {
console.log('no err pdf');
return;
}
});
});
}
Output on ubuntu
Output on windows
Extra space at top(empty space above red) in Windows is the issue.
THINGS that didn't work
1. Adding
"border": {
"top": "0px" // or mm, cm, in
}
to options in JS file
https://www.npmjs.com/package/html-pdf#options
Giving fixed "height": "10.5in" & "width": "8in" in options in JS file
Making margin-top & padding-top to 0px/-50px to pageHeader div.
Overriding margin-top & padding of body to 0px/-20px in #media print in bootstrap.css
Giving fixed height to header
Any help will be greatly appreciated. Thanks.
You can manually set the CSS property to html tag. In my case I was having problems developing the template in Windows and deploying it to Linux (Heroku).
I put zoom: 0.7 in the label html and now both views look the same.
html{zoom: 0.7;}
I was able to get more consistent results by removing the ID's so that it treated everything as content rather than separate header and content areas.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<div style="border-style: solid;border-width: 2px;color:red;">
header
</div>
<div style="border-style: solid;border-width: 2px;color:green;">
<div>
body
</div>
</div>
</body>
</html>
If you need an ID for styling, use something other than pageHeader / pageFooter to avoid the special treatment associated with those IDs.
Have you tried using a normalize style sheet to compensate for cross platform differences?
https://necolas.github.io/normalize.css/
I am using handelbars as my templating engine and I am curious to whether I could edit the main handlebars file. What I can do at the moment is something like this:
main.handlebars:
<html>
<head>
</head>
<body>
<div id='headerBox></div>
<div id='contents'>{{{body}}}</div><!--all contents goes here-->
</body>
When I use this method I will could create templates e.g. home.handlebars etc.
But what If I wanted to change something dynamically in the main.handlebars? For example in my website, I would love to have a login form so I would like to have something like this in the main.handelbars:
<html>
<head>
</head>
<body>
<div id='headerBox>{{If logged in print name, if not print sign up}}</div>
<div id='contents'>{{{body}}}</div><!--all contents goes here-->
</body>
</html>
TLDR, how to I change something dynamically in the main handlebars skeleton.
Thanks!
You'll want to write a Handlebars Helper function. Since you didn't include anything about how you're verifying login, I'll write a little demo.
In your template file:
<div id='headerBox'>{{header}}</div>
Handlerbars.registerHelper('header', function() {
if (loggedIn) {
return //however you're getting a username
} else {
return Sign Up
}
});
I see a lot of questions regarding on how to listen for changes in attributes. But none on how to actually change them.
Even in debug, I can't find the attributes in the object tree. How do I achieve this? is there a more polymeric way of doing the following ?
<polymer-element name="my-element" attributes="owner">
<template>
<p id="el">{{owner}}</p>
</template>
<script>
Polymer({
owner: "Miguel",
});
</script>
</polymer-element>
<my-element id="el1" owner="blabla"></my-element>
<script>
$(document).ready(function(){
$("el1").owner = "Mary"
})
</script>
It prints blablab, but doesn't change it to Mary
In 0.5, you need to wait for polymer-ready. See docs here.
<head>
<link rel="import" href="path/to/x-foo.html">
</head>
<body>
<x-foo></x-foo>
<script>
window.addEventListener('polymer-ready', function(e) {
var xFoo = document.querySelector('x-foo');
xFoo.barProperty = 'baz';
});
</script>
</body>
Ideally, your app would be one element like <my-app></my-app> so that you'd have a binding for the owner attribute like so:
<my-element owner="{{owner}}"></my-element>
And my-element would reside in another Polymer element in which you can set the owner attribute like so:
// Parent Polymer element
Polymer({
_someFunctionYouCall: function() {
this.owner = 'Mary';
}
});
i'm using the EJS template engine with nodejs/express and i'm wondering if it's possible to add another css or js file in e.g the index.ejs (not the layout.ejs)
layout.ejs
<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<link rel='stylesheet' href='/stylesheets/style.css' />
<link rel='stylesheet' href='/stylesheets/smoothness/jquery-ui-1.8.14.custom.css' />
</head>
<body>
<%- body %>
</body>
</html>
index.ejs
<h1><%= title %></h1>
<p>Welcome to <%= title %></p>
i don't want to add the second css file in every template but only the index.ejs - is there any way i can do that?
found a solution here: Node.js with Express: Importing client-side javascript using script tags in Jade views?
it's using jade instead of EJS but works all the same.
here are some code-snippets for express 2.4.0.
you have to add the following "helpers" to your app.js
app.helpers({
renderScriptsTags: function (all) {
if (all != undefined) {
return all.map(function(script) {
return '<script src="/javascripts/' + script + '"></script>';
}).join('\n ');
}
else {
return '';
}
}
});
app.dynamicHelpers({
scripts: function(req, res) {
return ['jquery-1.5.1.min.js'];
}
});
the layout.ejs looks sth like this:
<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<link rel='stylesheet' href='/stylesheets/style.css' />
<%- renderScriptsTags(scripts) %>
</head>
<body>
<%- body %>
</body>
</html>
if you don't add any scripts to the scripts-array, only 'jquery-1.5.1.min.js' will be included - if you want to add files to a subpage you can do this like so:
test.ejs
<% scripts.push('jquery-ui-1.8.14.custom.min.js', 'jquery.validate.min.js') %>
<h1><%= title %></h1>
<p>I'm a template with 3 js files in the header</p>
that's it.
As helpers and dynamicHelpers are gone in Express > 3, I rewrote pkyeck code so it works in Express 3.
So in app.js have this instead of the helpers / dynamicHelpers. Leave everything else as is.
app.locals({
scripts: [],
renderScriptsTags: function (all) {
app.locals.scripts = [];
if (all != undefined) {
return all.map(function(script) {
return '<script src="/javascripts/' + script + '"></script>';
}).join('\n ');
}
else {
return '';
}
},
getScripts: function(req, res) {
return scripts;
}
});
In app.js add line:
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.static(__dirname + '/public')); // This line.
In layout.ejs:
<!DOCTYPE html>
<html>
<head>
<title>Authentication Example</title>
<link rel="stylesheet" href="/stylesheets/style.css"/>
<script src="/javascripts/jquery.js"></script>
</head>
<body>
<%- body %>
</body>
</html>
In index.ejs or login.ejs:
<h1>Login</h1>
<form method="post" action="/login">
<p>
<label>Username:</label>
<input type="text" name="username">
</p>
<p>
<label>Password:</label>
<input type="text" name="password">
</p>
<p>
<input type="submit" value="Login">
</p>
</form>
<script src="/javascripts/test.js"></script> <!-- Second Script -->
In test.js:
$(document).ready(function() {
try{
alert("Hi!!!");
}catch(e)
{
alert("Error");
}
});
Regards.
Thanks #asprotte for providing this for express 4.x. Did you tested this?
Because it does not appears to be working for me. So I have made some changes to your code here are they:
Put this in app.js file
app.locals.scripts = [];
app.locals.addScripts=function (all) {
app.locals.scripts = [];
if (all != undefined) {
app.locals.scripts = all.map(function(script) {
console.log(script);
return "<script src='/js/" + script + "'></script>";
}).join('\n ');
}
};
app.locals.getScripts = function(req, res) {
return app.locals.scripts;
};
then in template file put (I am using ejs template here) :
<% addScripts(['cart.js']) %>
Then in the layout file we need these to append at the bottom of the page get the scripts
<%- getScripts() %>
I have tested it and its working for me. Please correct me if I am wrong.
Thanks,
Thanks for illustrating this option pkyeck!
In express 4.x app.locals is an object. Here's pkyeck's answer rewritten to work in express 4.x:
app.locals.scripts = [];
app.locals.addScripts=function (all) {
app.locals.scripts = [];
if (all != undefined) {
return all.map(function(script) {
return "<script src='/javascripts/" + script + "'></script>";
}).join('\n ');
}
else {
return '';
}
};
app.locals.getScripts = function(req, res) {
return scripts;
};