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JSON with document.getElementById() [closed]

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I'm a little confused with this json. I can type in json manually without document.getElementById("anID"); and it works fine. I keep getting unterminated string literal. Can someone show me the correct way of combining [multiple] document.getElementById() and sending them through json?
var form = '{"first_name":"'+document.getElementById("first_name").value+'",
"last_name":"'+document.getElementById("last_name").value+'"}';
var form = JSON.parse(form);
alert(form['first_name']);
alert(form.last_name);

This works. I think this is what you are trying to figure out:
var form = {"first_name":document.getElementById("first_name").value,
"last_name":document.getElementById("last_name").value};
console.log(form.first_name);
console.log(JSON.stringify(form));
It occurred to me that this is probably what you really wanted. You need to clean up your quotes, then use a little bit of eval():
var form = {"first_name":"document.getElementById('first_name').value",
"last_name":"document.getElementById('last_name').value"};
var runThatFunction = eval(form.first_name);
console.log(runThatFunction);

You can just build a Javascript object like this -
var show = function() {
var form2 = {};
form2.first_name = document.getElementById("first_name").value;
form2.last_name = document.getElementById("last_name").value;
alert(form2['first_name']);
alert(form2.last_name);
};
<input type="text" id="first_name" value="Eric" />
<input type="text" id="last_name" value="Johnson" />
Click me!

JavaScript match() function does not give output [closed]

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In JavaScript code I use regular expression match() function to find pattern and show the result, but it does not give a proper answer, means finding [i] character in giving sentences
<button onclick = "searchPattern()">pattern</button><br>
<p id = "demo"></p>
<script>
function searchPattern(){
var str = "Visti W3Schools!";
var paat = /[i]/g;
var result = str.match(patt);
document.getElementById("demo").innerHTML = result;
}
</script>

Read your JavaScript console
Uncaught ReferenceError: patt is not defined
You changed your variable name from paat to patt half way through your code.

How to remove value from array? [closed]

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Closed 8 years ago.
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Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
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I wanted to insert value in if condition and remove it in else condition.
$(document).ready(function(){
var ids=[];
$('input[type="checkbox"]').click(function(){
if($(this).prop('checked')){
var id = $(this).val();
ids.push(id)
}
else
{
//remove value from array
}
});
});

Instead of :
array.push(id)
It should be :
ids.push(id)
(because your array name is ids not array)

Click event's callback function parameter is event
$('input[type="checkbox"]').click(function(array){
"array" is instance of event on above code.
Then variable "array" cannot have function "push".

Why does JS throw unexpected error while re-writing a variable? [closed]

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 8 years ago.
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Error is:
function (a){var b,c,d,e=this[0];{if(arguments.length)return d=m.isFunction(a),this.each(function(c){var e;1===this.nodeType&&(e=d?a.call(this,c,m(this).val()):a,null==e?e="":"number"==typeof e?e+="":m.isArray(e)&&(e=m.map(e,function(a){return null==a?"":a+""})),b=m.valHooks[this.type]||m.valHooks[this.nodeName.toLowerCase()],b&&"set"in b&&void 0!==b.set(this,e,"value")||(this.value=e))});if(e)return b=m.valHooks[e.type]||m.valHooks[e.nodeName.toLowerCase()],b&&"get"in b&&void 0!==(c=b.get(e,"value"))?c:(c=e.value,"string"==typeof c?c.replace(lc,""):null==c?"":c)}}
What I am trying to do is to catch a variable on Focus Out:
$('.field').focusout(function() {
var date = $('.field').val;
console.log(date);
//Do something else
});
The HTML for field is:
<input type="text" class="field" />

Just a Typo...
val is a function. Use val()
Yes I know this question is not worth an answer, but otherwise someone will just transplant the comment as their own answer :)

how to check if hidden field has no value? [closed]

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 7 years ago.
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i make a hidden field and i want if hidden field has empty value then code run
here is my code:
<input type="hidden" id="itemscounter" name="itemscounter" value=""/>
if ($('#itemcounter').val()==""){
$('#itemscounter').val("1");
var counter=$('#itemscounter').val();
var quantity=$('#quantity').val();
var unitprice=$('#unitprice').val();
var linetotal=quantity*unitprice;
that.parent().find('.linetotal').val(linetotal)
$("#invoicetotalamount").val(+linetotal)
var discount=document.getElementById('discount').value ;
var discountamount= discount/100 * linetotal;
var amount=linetotal-discountamount;
$("#balanceamount").val(+amount);
}

There is a typo, your id is 'itemscounter', you are checking for 'itemcounter', also make sure you have put it within the <script> tags.
if ($('#itemscounter').val()==""){
$('#itemscounter').val("1");
var counter=$('#itemscounter').val();
var quantity=$('#quantity').val();
var unitprice=$('#unitprice').val();
var linetotal=quantity*unitprice;
that.parent().find('.linetotal').val(linetotal)
$("#invoicetotalamount").val(+linetotal)
var discount=document.getElementById('discount').value ;
var discountamount= discount/100 * linetotal;
var amount=linetotal-discountamount;
$("#balanceamount").val(+amount);
}