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How can I get the value of the checkbox in PHP? [closed]

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I am trying to make a registration page for my website but when I run it; it gives error. What am I doing wrong?
<?php
//Form values
$name_value=$_POST['Name_input'];
$Username_value=$_POST['Username_input'];
$DOB_value=$_POST['DOB_input'];
$Password_value=$_POST['Password_input'];
$Phone_number_value=$_POST['Phone_number_input'];
$Python_checkbox_value=$_POST['Python_checkbox'];
$Java_checkbox_value=$_POST['Java_checkbox'];
$C_sharp_checkbox_value=$_POST['C#_checkbox'];
$HTML_checkbox_value=$_POST['HTML_checkbox'];
$Cpp_checkbox_value=$_POST['C++_checkbox'];
$R_checkbox_value=$_POST['R_checkbox'];
$swift_checkbox_value=$_POST['swift_checkbox'];
$kotlin_checkbox_value=$_POST['kotlin_checkbox'];
$JS_checkbox_value=$_POST['JS_checkbox'];

Take a look at this code :
<form method="GET">
<input type="checkbox" value="value" name="name">checkbox label</input>
<input type="submit">
</form>
<?php
if (isset($_GET["name"]))
{
echo $_GET["name"];
}
?>
As you can see when I submit the form without checking, the parameter in URI is empty because the checkbox isn't defined (I used GET method)
But when I check it, you can see the parameter is name=value

required input fields on a html form [closed]

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Closed 1 year ago.
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I am trying to create a html form with required input fields. but its not responding. below is the code
<div class="col-sm-6">
<label for="city" class="form-control">city
<input name="city" type="text" id="city" class="form-control" required>
</label>
<div class="invalid-feedback">
valid city is required
</div>
</div>

If by "not responding" you mean that a user can submit the form without entering a "City" value, it may be because you need a <form> element around form controls in order to allow browsers' default behavior for required inputs to work correctly.

Try GetElementsByClassName [closed]

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Closed 2 years ago.
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try js ref_doc_getelementsbyClassName
"Uncaught TypeError: Cannot set property 'value' of null "
This HTML code
<input type="text" class="form-control" class="test" />
This JS code
function inputtest() {
document.getElementsByClassName('test').value = selectedControl;
}

Change your html:
<input type="text" class="form-control test" />
JS
function inputtest() {
document.getElementsByClassName('test')[0].value = selectedControl;
}

Javascript - Clear search output when submitting another text input [closed]

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For my project I need to create a simple search engine for my webpage.
I need a way to clear my previous search results when I submit another search into the form without refreshing the entire page.
My Javascript file contains the objects I am searching for.
HTML:
<form>
<div class="form-group">
<input id="term" class="form-control" type="text">
</div>
<button id="search-button" class="btn btn-default" type="button">
Search</button>
</form>
<div id="results-area"></div>

Correct me if i'm wrong:
Code with jQuery:
$(form).submit(function(e){
$("#results-area").html("");
})

Using jQuery it would go like this:
$("#search-button").click(function(){
// your search function here
$("#term).val('');
});

Check if a text box starts with 92 using javascript [closed]

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<form name="home" action="" onsubmit="return Validateform();" method="post">
<input type="text" name="receiver" />
<input type="submit" value="send" name="send" />
</form>
What is the javascript to alert if the textbox does not start with 92 on submit?

I recommend you read a JavaScript tutorial. Try here.
To answer your question, this will probably work. If you're wondering why you're getting downvoted - asking people to write your code for you is generally considered bad form, so try not to do this in future. :)
function Validateform(e) {
if (document.getElementsByName('receiver')[0].value.substring(0, 2) !== "92") {
e.preventDefault();
alert("Alert");
}
}