For my webpage I use Django 1.9 for the server-side and AngularJs for some client-side tasks (validation etc).
Also for the CSS I use Bootstrap (and the Angular-Ui).
Now I created the forms I need in Django which inserts them on the actual page. Amongst others, I have an input field of type file which lets the user upload a file.
When the user has chosen a file, I would like to do some checks in AngularJs. The problem is: I have no clue how I can get some kind of callback from Django to know that the upload-file window was closed.
My current solution involves a plain javascript function which is bound to the upload field and calls an AngularJs function, but this does not work properly.
So in my forms.py it looks like that:
class UploadForm(forms.Form):
fa_file = forms.FileField(label='Select a Fasta file',
widget=forms.TextInput(attrs={'type': 'file'})
The part of the html page where this field is inserted looks like that:
<div class="panel-body">
<input type="text" id="uploadFile" placeholder="Choose File" disabled="disabled"/>
<div class="file-upload btn btn-sm btn-primary">
<span>Upload</span>
{{ form.fa_file }}
</div>
</div>
The javascript function which is bound to the file-upload field is:
<script>
document.getElementById("id_fa_file").onchange = function () {
document.getElementById("uploadFile").value = this.value;
angular.element(this).scope().changeFaFileValue(this.value);
};
</script>
This on change method is executed whenever the user finishes choosing a file. Essentially this is the behavior I want to achieve and the AngularJS function of my controller 'changeFaFileValue' is executed as well.
But it seems that the execution happens in its own scope. I can tell because I have a watcher in my AngularJS controller for a variable which is changed in 'changeFaFileValue' and this watcher is not triggered when the function is called via this plain Javascript on change function.
But if I call the 'changeFaFileValue' from somewhere in my controller, the watcher executes as expected.
The methods in the controller look like this:
$scope.$watch('allow_submit', function(){
console.log("IT WORKED.");
});
$scope.changeFaFileValue = function(newPath){
$scope.fa_file_js = newPath;
$scope.allow_submit = !$scope.allow_submit;
}
I think I am missing something important here.
Can you please tell me what would be the correct way to achieve the desired behavior? Is my approach correct at all?
Related
I am creating a Spring Boot web application with Thymeleaf as one of my project's technologies. I've created a form in my HTML page which includes a button to save a JavaScript variable. However, I cannot insert that JavaScript Variable into the value attribute of my input tag. I know that my Spring Boot controllers are working fine because every time I click the "Save Top Ten and Location" button, a successful POST request is made. The only problem I am dealing with is properly filling out the "loc_and_rests" datamember of my entry object.
Here is the form I've created (snippet of my HTML): As you can see, I have a checkbox input tag that calls the JavaScript function, changeVal(), when clicked which should change the value attribute of my button in the line to the value of the JavaScript variable, "loc_and_rests," immediately following the input tag.
<form name="save" action="#" th:action="#{/app/save-entry}" th:object="${entry}" method="POST">
<input type="checkbox" onclick="changeVal()">
<button type="submit" th:field="*{loc_and_rests}" name="submit">Save Top Ten and Location</button>
</form>
Here is my JavaScript function, changeVal(). The variable loc_and_rests is a global variable which I set in a different function.
function changeVal() {
document.save.submit.value = loc_and_rests;
console.log("saved");
}
Also, just to show my controllers are working, here is a screenshot of the result of my POST requests. I added question marks and 'x' to some of the entries to see if they would work if I explicitly set a value with the value attribute.
Thank you.
Before I provide a bunch of code I'd like to first find out if what I'm trying to do is even possible.
I've created a web based version of the dice game called PIG using HTML & JavaScript. The user can change some of the game's settings by clicking on a "Settings" button on the main page. This button brings up a modal window containing an HTML form (). I'd like to use the data that the users enters and submits on this form to update various settings on the game's main page.
I chose to use an HTML5 form because was hoping to use the native HTML5 form validation capabilities rather than try and replicate that validation checking logic myself using JavaScript.
So my approach was to use javascript to get the data off the form on submit. I tried two different approaches to get this to work:
1) Using an "onsubmit=function getSettings()" on the tag
2) Using a submit button for the form with an onclick="getSettings()".
With both of these approaches I was able to successfully get all the values from the form on submit and use those values to successfully populate the main game page using the gettSettings() function however when I exit the getSettings() function the webpage values that I updated don't stick...they revert back to the original values regardless of which of these two approaches I use.
I know the values were successfully updated because when I set a break point on the last statement of the getSettings() method I can see that all of the values on the main page have been updated to reflect what was filled in on the form...so I know I'm grabbing all of the data successfully and updating the main page with those values.
I'm puzzled as to why the values that I successfully change on the web page simply revert back to their original value upon exit of the getSettings() function.
Maybe it's just not possible to do what I'm trying to do? And if not does anyone know why given I can see the values are successfully changed before they revert back to their original value. What am I missing?
Again I'm using a Form and collecting the data on submit so that I can leverage the "native" HTML5 form validation capabilities.
Regards.
***** EDIT TO ADD KEY SEGMENTS OF CODE *******
Here is the code HTML Code for the modal form:
<form name="config-settings" onsubmit="getSettings()">
<!-- <form name="config-settings">-->
<span class="errMsg"></span>
<div class="row clearfix">
<div>
<label>Player 1:</label>
</div>
<div>
<input type="text" name="input-name-0" id="input-name-0" maxlength="10" placeholder="Enter name" pattern="^\S+$">
</div>
</div>
<div class="row clearfix">
<div>
<label>Player 2:</label>
</div>
<div>
<input type="text" name="input-name-1" id="input-name-1" maxlength="6" placeholder="Enter name" pattern="^\S+$">
</div>
</div>
<div class="row clearfix">
<div>
<label>Winning Score:</label>
</div>
<div>
<input type="number" name="winning-score" id="winning-score" default="100" placeholder="Enter winning score">
</div>
</div>
<div class="row clearfix">
<div>
<label>Number of Dice:</label>
</div>
<div>
<select name="diceValues" id="dice-value">
<option value=""> - Select - </option>
<option value="dice-1">One Dice</option>
<option value="dice-2">Two Dice</option>
</select>
</div>
</div>
<!-- Below is alt method I used to submit form..yields same results -->
<!-- <input type="submit" value="Submit" onclick="getSettings()">-->
<input type="submit" value="Submit">
</form>
Here are the global variables defined and used in getSettings() method:
// Global variables
var scores, roundScore, activePlayer, gamePlaying, gamesWonCount, playerNames, winningScore, numOfDice, matchScore, msgs;
var player0, player1, score;
var player0Field = document.getElementById('name-0');
var player1Field = document.getElementById('name-1');
var scoreField = document.getElementById('winScore');
Here is the listener for the Settings button on the main web page that brings up the setting modal window containing the settings form:
//*********************************************************
// Open Settings Modal Windows
//*********************************************************
document.querySelector('.btn-settings').addEventListener('click', function () {
// Settings can't be changed if game is actively underway
if (!gamePlaying || roundScore === 0) {
document.querySelector('#modal-settings').style.display = 'block';
} else {
// Make error message visible
msgs.style = 'block';
// Create message to indicate settings successfully updated
msgs.textContent = "Settings can't be updated during game";
msgs.style.backgroundColor = 'pink';
fadeOut(msgs);
}
});
Here is the getSettings() javaScript function (note: there are no local variables defined in this function...they are all defined as global values (first few lines of javaScript app).
function getSettings() {
// Alternative call if I want this function to be called via eventListner
//document.querySelector('.btn-save').addEventListener('click', function () {
console.log("getSettings method called");
player0 = document.forms["config-settings"]["input-name-0"].value;
player1 = document.forms["config-settings"]["input-name-1"].value;
score = document.forms["config-settings"]["winning-score"].value;
// Reset msgs so they will be displayed each time
msgs.style = 'block';
playerNames[0] = player0;
player0Field.innerHTML = playerNames[0];
playerNames[1] = player1;
player1Field.textContent = playerNames[1];
// Set Winning score on UI to value on form
scoreField.textContent = score;
// numOfDice = document.getElementById('dice-value').value;
// Create message to indicate settings successfully updated
msgs.textContent = "Successfully updated settings";
msgs.style.backgroundColor = 'lightgreen';
fadeOut(msgs);
document.querySelector('#modal-settings').style.display = 'none';
}
I don't know exactly what this getSettings() function of yours is supposed to do, but I can try to give you a piece of advice:
Some of the form validation capabilities of HTML5 are not entirely supported on all of the used browsers(some users don't fancy to update their browser). Therefore relying on the "native" validation of HTML5 isn't exactly best practice.
If you want to manipulate the form values in any way before submitting the form I would rather add a listener to the submit button for click events, prevent any other action, make the checks/ manipulation of the form data and then manually submit the form. Anyways, front-end validation isn't entirely safe, so if you're peddling sensitive data it's mandatory that you'll make checks on serverside(if your app uses a server).
To exemplify what I've explained earlier:
document.getElementById("myBtn").addEventListener("click", function(event){
//Stops the form submitting.
event.stopImmediatePropagation();
//Do the checks here.
//Sends the form.
document.getelementById("myForm").sumbit();
);
If you change local variables inside this getSettings() function, the variables will be changed only within the function scope. You might want to read about scope in javascript. (this was just an educated guess).
I hope you find this useful, good luck!
Okay...I finally figured it out! The problem was not a scoping problem but instead and issue with how "onSubmit" works.
The solution involved making two changes:
1) Adding a return statement to the "onsubmit" attribute when calling the "getSettings()" function;
<form name="config-settings" onsubmit="return getSettings()">
2) Returning false at the end of the gettSettings();
return false;
Note: I had previously tried returning true but not false. I was errantly under the impression that returning false value from getSettings() function would disable HTML5 "native" validation and force me to implement all of the error checking myself...which was not what I wanted. It is now my understanding that returning false merely prevents the form from being submitted..but it doesn't disable the HTML5 native validations.
This solution worked perfectly for me because my goal was not to submit the form to the server (as there is no server component here) but merely to use the "native" HTML5 form checking and then update the values on the local web page.
With all of that said I'm still not entirely sure why when I didn't provide the return statement or when I returned true why all of my changes reverted back to their originally value. If anyone can shed some light on why I'd appreciate it.
Cheers
I opened up a yahoo store through their Merchant Service. They have a pretty good store catalog that I have used on a business site that I own. I like it so I decided to use the service again on another business I own. I got the site built but have ran into a few issues with calling the Yahoo Catalog Tags. The tags are basically comments. EX: (<!--#ystore_order id=item_id -->). When the site is loaded it is parsed and the page loads the product details in place of this tag/comment.
I can get everything to work except for the action attribute of my form.
I have tried a bunch of things but I cannot seem to get the action set for my form. If I hard code the tag then it works fine but obviously if I did that then I would have to create a page for every single product.
My form:
<div id="list">
<form method="post">
<input id="btnSubmit" type="submit" value="Add To Cart">
</form>
</div>
Trying to add the comment/tag to form action attribute. I've done it this way(below) and also by getting rid of the variable and just paring the url in the jquery attr function.
<script language="javascript">
$.ajaxSetup({cache: false});
$(document).ready(function(){
//Get URL from URL Query String.
var obj = getUrlVars()["Object"];
//Set form action attribute
$('form').attr('action', '<!--#ystore_order id='+ obj +' -->');
});
</script>
I've also tried creating the form dynamically.
<script language="javascript">
$.ajaxSetup({cache: false});
$(document).ready(function(){
//Get URL from URL Query String.
var obj = getUrlVars()["Object"];
var new_form = '<form method="post" action="<!--#ystore_order id='+obj + ' -->">' +
'<input type="submit" value="Add To Cart" id="btnSubmit">' +
'</form>';
$('#list').append(new_form);
});
</script>
I have tried to escape some characters but have had no success there either.
"\<\!--#ystore_order id='+obj + ' --\>"
I know the issue has something to do with the comment syntax but if I can add it manually then I should be able to do it dynamically. I know this is a hard one to test but if anyone thinks they may have a solution I would be happy to set up an ftp account on my site so you can test and I will provide the product ID's for testing. I've fought with this for about 30+ hours.
Yahoo store tags are populated server-side. Adding a store tag on the client side using Javascript won't do anything, because the code that recognizes the store tag and appends the appropriate html will never see the tag you drop in on the client side. There's no client-side solution possible
The best solution here would be to write a server side program to populate a template with the appropriate tag in response to http requests. I'm not super-familiar with the Yahoo store, so I don't know what the best language for this would be, but it would be a very simple program given how straightforward it sounds like your template is. Since this is already embedded in a site you own, I'd just use whatever backend language you are already working in.
Once you have a server side script that executes and returns the html you need, you could use AJAX to populated it with the appropriate product details as needed.
i have a textarea defined by an id
<textarea id='vegetable'> Tomato </textarea>
i have a button
<button type="button" onclick="MyFunction()">generate vegetable</button>
which trig a javascript in order to modify the content of the textarea
<script>
function MyFunction()
{
document.getElementById("vegetable").innerHTML = VegetableNameGenerator();
}
</script>
The problem is this php action :
<form action="{{ path('mypath', { 'myparam': ??? }) }}" method="post" >
<input type="submit" />
</form>
??? must be the content of the textarea (which is also known by the javascript code) but i don't know how to access it in twig.
I guess there are several way of doing that : jquery, dom, global variable twig... any syntax example would be great.
This is impossible in the way you're describing it.
When a request is made to the server, twig renders the page, then it is sent to the browser, and then javascript can run.
There are options for how to make this work:
Create a controller action which returns the rendered path when you call it using a GET request with the provided parameter. Then create an event listener on the submit button that blocks the submit process until it has retrieved the route via AJAX and modified the form's action attribute.
Redirect from your controller to the path you want displayed. myparam will be included in the post data, so you can redirect from your controller action after you've handled the form.
$this->redirect($this->get('router')
->generate('mypath',
array('myparam'=>
$this->getRequest()->get('myparam')
),
true);
let me start by saying it may look simple but im finding it extremely difficult.
ive made a search script that uses PHP and to fetch a result would look like this
search.php?term=alice&submit=Submit
Standard stuff.. problem is, i use an SPI with AJAX and PHP so my results would have to load dynamically into a div, whilst still keeping the hash value, as not to lose the page the user had visited previous to searching.
jQuery.history.js is the plugin i use for back button support, which requires links to be like such:
Home Page
this would load 'home.html' into a div named pageContent. as far as i know theres no way to call php files unless you develop a little hack, which i have,
here is my JavaScript/jQuery for my search form:
<script language="JavaScript">
$(document).ready(function() {
// bind form using ajaxForm
$('#search1').ajaxForm({
// target identifies the element(s) to update with the server response
target: '#pageContent',
// success identifies the function to invoke when the server response
success: function() {
$('#pageContent');
var hash = '#search.php?term='+($('#query').val()+'&submit=Submit').replace(/ /g, '+');
var stripped = hash.replace(/(<([^>]+)>)/ig,"");
update(window.location.hash = stripped);
}
});
});
</script>
Heres the form:
<form id="search1" action="search.php" method="post">
<input id="query" type="text" name="term" />
<input type="submit" name="submit" value="Submit" />
</form>
My problem is this:
ive tried this.form.reset(); this: Resetting a multi-stage form with jQuery , yet none of this works. please help me if you know a way of doing this..
$('#query').val(DefaultValue);
with this u can set your value to whatever you want, like blank: '';