In an HTML page, I want to pick the value of a javascript variable.
Below is the snippet of HTML page:
<input id="hidval" value="" type="hidden">
<form method="post" style="padding: 0px;margin: 0px;" name="profile" autocomplete="off">
<input name="pqRjnA" id="pqRjnA" value="" type="hidden">
<script type="text/javascript">
key="pqRjnA";
</script>
My aim is to read the value of variable key from this page using jsoup.
Is it possible with jsoup? If yes then how?
Since jsoup isn't a javascript library you have two ways to solve this:
A. Use a javascript library
Pro:
Full Javascript support
Con:
Additional libraray / dependencies
B. Use Jsoup + manual parsing
Pro:
No extra libraries required
Enough for simple tasks
Con:
Not as flexible as a javascript library
Here's an example how to get the key with jsoupand some "manual" code:
Document doc = ...
Element script = doc.select("script").first(); // Get the script part
Pattern p = Pattern.compile("(?is)key=\"(.+?)\""); // Regex for the value of the key
Matcher m = p.matcher(script.html()); // you have to use html here and NOT text! Text will drop the 'key' part
while( m.find() )
{
System.out.println(m.group()); // the whole key ('key = value')
System.out.println(m.group(1)); // value only
}
Output (using your html part):
key="pqRjnA"
pqRjnA
The Kotlin question is marked as duplicate and is directed to this question.
So, here is how I did that with Kotlin:
val (key, value) = document
.select("script")
.map(Element::data)
.first { "key" in it } // OR single { "key" in it }
.split("=")
.map(String::trim)
val pureValue = value.replace(Regex("""["';]"""), "")
println("$key::$pureValue") // key::pqRjnA
Another version:
val (key, value) = document
.select("script")
.first { Regex("""key\s*=\s*["'].*["'];""") in it.data() }
.data()
.split("=")
.map { it.replace(Regex("""[\s"';]"""), "") }
println("$key::$value") // key::pqRjnA
Footnote
To get the document you can do this:
From a file:
val input = File("my-document.html")
val document = Jsoup.parse(input, "UTF-8")
From a server:
val document = Jsoup.connect("the/target/url")
.userAgent("Mozilla")
.get()
Related
I have a main page with a popup window.
<textarea class="form-control item"></textarea>
<button type="button" class="btn btn-primary" name="name">Send</button>
There is also a second page. (/conclusion/main)
<textarea id="retro" style="height: 200px; width: 800px"></textarea>
I enter the text in the window and send. The window should close and the text should be sent to the second page and the text should be saved in the field "textarea". Even if they close the page or reload, the text should remain in the second page.
This code allows you to save, but after closing the page, does not save
(function(){
var textarea = document.getElementById('retro');
if (localStorage.retro)
{
textarea.value = localStorage.retro;
}
textarea.onchange = function()
{
localStorage.retro = this.value;
}
})();
Sends from the first page to the second
function getParams(){
var idx = document.URL.indexOf('?');
var params = new Array();
if (idx != -1) {
var pairs = document.URL.substring(idx+1, document.URL.length).split('&');
for (var i=0; i<pairs.length; i++){
nameVal = pairs[i].split('=');
params[nameVal[0]] = nameVal[1];
}
}
return params2;
}
params = getParams();
name = unescape(params["name"]);
document.getElementById('retro').innerHTML = name;
There are some questions around what you are trying to do here. What I have done is broken this down into 2 parts
Passing the local storage between 2 pages and accessing it.
Decoding Parameters in the URL and assigning them
Some assumptions that I made:
I have noticed some of the classes from bootstrap so i assume that you have jQuery on the page and also you may know how to use it.
Using chrome for testing this
PART 1 - Passing localstorage between windows:
First thing to note is you may be better using a cookie library (js-cookie) or creating one yourself that you can access. As localstorage may well be insecure depending on what data you want to store in there.
With that out of the way, you were on the right track, just needed to add your event listener to 'input' as i think then every keystroke the data in local storage is being updated.
Page 1
HTML
<textarea id="retro" class="form-control item"></textarea>
<button type="button" class="btn btn-primary" name="name">Send</button>
JS (I would recommend place this at the bottom of you page for quick testing)
<script type="text/javascript">
var textarea = document.getElementById('retro');
textarea.addEventListener('input',function(){
localStorage.setItem('retro', this.value);
})
</script>
In Chrome developer tools if you watch the variable 'localstorage' then you will see this change as you key in the value.
What I have done here is bound the event listener to the text area so that any 'input' the value changes, furthermore is am setting the item in the localstorage
PAGE 2
HTML
<textarea id="retro" style="height: 200px; width: 800px"></textarea>
JS
<script type="text/javascript">
var textarea = document.getElementById('retro').value = localStorage.getItem('retro');
</script>
Here using the 'getItem' method for localstorage you can then retrieve it from the storage area and output it as the value of the textarea.
Obviously is the cache or localstorage is cleared then this value will disappear.
PART 2 - Decoding Parameters in the URL and assigning them
$.urlParam = function(name){
var results = new RegExp('[\?&]' + name + '=([^]*)').exec(window.location.href);
if (results==null){
return null;
}
else{
return results[1] || 0;
}
}
This function above will get you any parameter you want form the url I found this from here. This is using jQuery.
Here is how you would use it
// example.com?param1=name¶m2=&id=6
$.urlParam('param1'); // name
$.urlParam('id'); // 6
$.urlParam('param2'); // null
Well I hope this answers your question on both parts, and helps you further, please add any comments if I have missed anything and I will be happy to update my answer
I have a few JavaScript functions like the one below...
<input type="text" id="myField">
<script>
$("#myField").val("10:20:30");
function doNotEditIt(fieldId){ // this function can't be edited!
var myVar = $("#" + fieldId).val(); // it's 10:20:30, i want 10.2030
// ... code which converts the value
}
</script>
...which I can't edit or change them, because they are universal for all of my previous fields. I want add new fields to my page (like myField; see below) and use functions which are not customised specifically for them.
Is it possible to change the format of a returning value? For example...
$("#myField").changeReturningFormat(function(){
// ... code which change format
});
...or change the display format? For example...
$("#myField").val('10.2030'); // a user will see 10:20:30
Check the below sample, you just need to use replace():
var str = "10:20:30";
str = str.replace(/:/, '.');
console.log(str.replace(/:/, ''))
I have a jsp file with a scriptlet tag, I am getting the values of .properties file in it .I have a java script tag in which I am storing the value from the dropdown in a variable. On selecting some value in the dropdown I want to compare it with the property in the scriptlet and if it is equal a value from properties file must populate in my textbox. I have tried the following code but it is not working
My scriplet tag
<%
Properties prop = new Properties();
String propFileName = "server. properties";
InputStream inputStream = getClass().getClassLoader().getResourceAsStream(propFileName);
if (inputStream != null) {
prop.load(inputStream);
} else {
throw new FileNotFoundException("property file '" + propFileName + "'not found in the classpath");
}
String appName = prop.getProperty("Demo_name");
String link = prop.getProperty("Demo_Links");
String database = prop.getProperty("DemoApps_DataBase");
%>
JavaScript
<script type="text/javascript">
function OnSelectionChange(serverName) {
var selectedOption = serverName.options[serverName.selectedIndex];
var txtbox=document.getElementById('serverLink');
var appName=<%=appName%>;
var links=<%=link%>
alert(appName.value);
if(selectedOption.value==appName.value){
txtbox.value=links.value;
}
}
</script>
Try this code. Is Your selected value is case sensitive?
<script type="text/javascript">
function OnSelectionChange(serverName) {
var selectedOption = serverName.options[serverName.selectedIndex].value;
var txtbox=document.getElementById('serverLink');
var demoName='<%=demoServer%>';
var testName='<%=testingServer%>';
var PNGName='<%=pngServer%>';
var DCPName='<%=dcpServer%>';
var demoLink='<%=demoLink%>';
var testLink='<%=testingLink%>';
var pngLink='<%=pngLink%>';
var dcpLink='<%=dcpLink%>';
if(selectedOption==appName){
txtbox.value=links;
}
if(selectedOption==PNGName){
txtbox.value=pngLink;
}
if(selectedOption==DCPName){
txtbox.value=dcpLink;
}
if(selectedOption==demoName){
txtbox.value=demoLink;
}
}
</script>
Using scriplets populate the values in a hidden field from your scriplet like :
<input id=hiddenPops type="hidden" name="Language" value="English">prop1=value2;prop2=value3</input>
In your javascript get the value of the above field using getElementById(hiddenPops )
Split the value string into array or as desired and you can work with it to match the keys and fetch the corresponding values.
Note: Its a solution but your approach is not great. Try to use modern JS frameworks which could allow you to talk to the server directly or simply use Ajax
I need to write some html with placeholder used for javascript.
ex:
<span><placeholder data-id="42" data-value="abc"/><span>
Later on, a script will access those placeholders and put content in (next to?) them.
<span><placeholder data-id="42" data-value="abc"><div class="Google"><input type="text" value="abc"/></div><span>
But the placeholder tag doesn't exist. What tag can be used? Using < input type="hidden" .../> all over feels wrong.
Creating Custom tag
var xFoo = document.createElement('placeholder');
xFoo.innerHTML = "TEST";
document.body.appendChild(xFoo);
Output:
<placeholder>TEST</placeholder>
DEMO
Note: However creating hidden input fields with unique ID is good practice.
give your span element an id like,
<span id="placeToAddItem"><span>
and then in jQuery,
$('#placeToAddItem').html('<div class="Google"><input type="text" value="abc"/></div>');
or else
var cloneDiv = $('.Google');
$('#placeToAddItem').html(cloneDiv);
Example
The best way to do this, is using <input type='hidden' id="someId" value=""> tags.
Then you can easily access them by using jQuery, and recall the variable or change it.
var value = $("#someId").val(); to get variable or $("#someId").val(value) to change it.
This complete, no jQuery solution allows you to specify the placeholder/replacement html as a string within the element that will be replaced.
EG HTML:
<div data-placeholder="<div class='Google'><input type='text' value='abc'/></div>"></div>
<div data-placeholder="<div class='Boogle'><input type='text' value='def'/></div>"></div>
<div data-placeholder="<div class='Ooogle'><label>with label <input type='text' value='ghi'/></label></div>"></div>
<span data-placeholder="<em>Post JS</em>">Pre JS</span>
<br />
<button id="test">click me</button>
JS:
Use querySelectorAll to select all elements with the attribute 'data-placeholder' (returns a NodeList)
var placeholders = document.querySelectorAll('[data-placeholder]'); //or by ids, classnames, element type etc
Extend the NodeList prototype with a simple 'each' method that allows us to iterate over the list.
NodeList.prototype.each = function(func) {
for (var i = 0; i < this.length; i++) {
func(this[i]);
}
return this;//return self to maintain chainability
};
Extend the Object prototype with a 'replaceWith' method that replaces the element with a new one created from a html string:
Object.prototype.replaceWith = function(htmlString) {
var temp = document.createElement('div');//create a temporary element
temp.innerHTML = htmlString;//set its innerHTML to htmlString
var newChild = temp.childNodes[0];//(or temp.firstChild) get the inner nodes
this.parentNode.replaceChild(newChild, this);//replace old node with new
return this;//return self to maintain chainability
};
Put it all together:
placeholders.each(function(self){
self.replaceWith(self.dataset.placeholder);//the 'data-placeholder' string
});
Another example but here we only replace one specific element with some hard-coded html on click:
document.getElementById("test").addEventListener('click', function() {
this.replaceWith("<strong>i was a button before</strong>");
}, false);
DEMO: http://jsfiddle.net/sjbnn68e/
use the code below :
var x = document.createElement('placeholder');
x.innerHTML = "example";
document.body.appendChild(x);
The only way I know how to print a huge string without using += is to use \ backslashes. ugly!
<div id="foo"></div>
<script type="text/javascript">
var longString = '<div id="lol">\
<div id="otherstuff">\
test content. maybe some code\
</div>\
</div>';
document.getElementById('foo').innerHTML = longString;
</script>
is there any way to do this where the longString is untainted? php has $foo = ''' long multiline string '''; I want this in javascript!
Anyone know of a better method for printing long, multi-line strings in javascript?
In general, the answer is: not in the language syntax. Though as Ken pointed out in his answer there are many work-arounds (my personal method is to load a file via AJAX). In your specific case though, I'd prefer creating a HTML constructor function so you can then define the HTML structure using javascript object literals. Something like:
var longString = makeHTML([{
div : {
id : "lol",
children : [{
div : {
id : "otherstuff",
children : [{
text : "test content. maybe some code"
}]
}]
}]
which I find to be much easier to handle. Plus, you this would allow you to use real function literals when you need it to avoid string quoting hell:
makeHTML([{
span : {
onclick : function (event) {/* do something */}
}
}]);
note: the implementation of makeHTML is left as exercise for the reader
Additional answer:
Found some old code after a quick scan through my hard disk. It's a bit different from what I suggested above so I thought I'd share it to illustrate one of the many ways you can write functions like this. Javascript is a very flexible language and there is not much that forces you to write code one way or another. Choose the API you feel most natural and comfortable and write code to implement it.
Here's the code:
function makeElement (tag, spec, children) {
var el = document.createElement(tag);
for (var n in spec) {
if (n == 'style') {
setStyle(el,spec[n]);
}
else {
el[n] = spec[n];
}
}
if (children && children.length) {
for (var i=0; i<children.length; i++) {
el.appendChild(children[i]);
}
}
return el;
}
/* implementation of setStyle is
* left as exercise for the reader
*/
Using it would be something like:
document.getElementById('foo').appendChild(
makeElement(div,{id:"lol"},[
makeElement(div,{id:"otherstuff"},[
makeText("test content. maybe some code")
])
])
);
/* implementation of makeText is
* left as exercise for the reader
*/
One technique if you have a big block is a <script> tag with an invalid type. It will be ignored by browsers.
<script type="text/x-my-stuff" id="longString">
<div id="lol">
<div id="otherstuff">
test content. maybe some code
</div>
</div>
</script>
<script type="text/javascript">
var longString = document.getElementById("longString").text;
document.getElementById('foo').innerHTML = longString;
</script>
A few somewhat unattractive options are discussed in the answers to this question.
You really could minimize this ugliness by creating your <div id="lol"> as HTML, and set its content with .innerHTML = "test content. maybe some code"
I don't like creating HTML in Javascript because of this exact issue, and instead use "template" elements which i simply clone then manipulate.
var lol = document.getElementById("template_lol").clone();
lol.firstChild.innerHTML = "code and stuff";
foo.appendChild(lol);
And this is the HTML:
<body>
<div>normal stuff</div>
<div style="display:none" id="templateBucket">
<div id="template_lol"><div class="otherstuff"></div></div>
</div>
</body>
This works too :
var longString =
'<div id="lol">' +
'<div id="otherstuff">' +
'test content. maybe some code' +
'</div>' +
'</div>';