如何动态创建 < input type = “ text”/>

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With JavaScript:

var input = document.createElement("input");
input.type = "text";
input.className = "css-class-name"; // set the CSS class
container.appendChild(input); // put it into the DOM

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Maybe the method document.createElement(); is what you're looking for.

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You could do something like this in a loop based on the number of text fields they enter.

$('<input/>').attr({type:'text',name:'text'+i}).appendTo('#myform');

But for better performance I'd create all the html first and inject it into the DOM only once.

var count = 20;
var html = [];
while(count--) {
html.push("<input type='text' name='name", count, "'>");
}
$('#myform').append(html.join(''));

Edit this example uses jQuery to append the html, but you could easily modify it to use innerHTML as well.

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You could use createElement() method for creating that textbox

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I think the following link will help you. If you want to generate fields dynamically and also want to remove them on the same time you can get the help from here. I had the same question, So i got the answer

$(function() {
var scntDiv = $('#p_scents');
var i = $('#p_scents p').size() + 1;


$('#addScnt').live('click', function() {
$('<p><label for="p_scnts"><input type="text" id="p_scnt" size="20" name="p_scnt_' + i +'" value="" placeholder="Input Value" /></label> <a href="#" id="remScnt">Remove</a></p>').appendTo(scntDiv);
i++;
return false;
});


$('#remScnt').live('click', function() {
if( i > 2  ) {
$(this).parents('p').remove();
i--;
}
return false;
});
});

http://jsfiddle.net/jaredwilli/tZPg4/4/

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See this answer for a non JQuery solution. Just helped me out!

Adding input elements dynamically to form

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Using Javascript, all you need is document.createElement and setAttribute.

var input = document.createElement("input");
input.setAttribute('type', 'text');

Then you can use appendChild to append the created element to the desired parent element.

var parent = document.getElementById("parentDiv");
parent.appendChild(input);

小开

To create number of input fields given by the user

Get the number of text fields from the user and assign it to a variable.

var no = document.getElementById("idname").value

To create input fields, use createElement method and specify element name i.e. "input" as parameter like below and assign it to a variable.

var textfield = document.createElement("input");

Then assign necessary attributes to the variable.

textfield.type = "text";

textfield.value = "";

At last append variable to the form element using appendChild method. so that the input element will be created in the form element itself.

document.getElementById('form').appendChild(textfield);

Loop the 2,3 and 4 step to create desired number of input elements given by the user inside the form element.

for(var i=0;i<no;i++) {
var textfield = document.createElement("input");
textfield.type = "text"; textfield.value = "";
document.getElementById('form').appendChild(textfield);
}

Here's the complete code

function fun() {
/*Getting the number of text fields*/
var no = document.getElementById("idname").value;
/*Generating text fields dynamically in the same form itself*/
for(var i=0;i<no;i++) {
var textfield = document.createElement("input");
textfield.type = "text";
textfield.value = "";
document.getElementById('form').appendChild(textfield);
}
}

<form id="form">
<input type="type" id="idname" oninput="fun()" value="">
</form>

小开

you can use ES6 back quits

  var inputs = [
`<input type='checkbox' id='chbox0' onclick='checkboxChecked(this);'> <input  type='text' class='noteinputs0'id='note` + 0 + `' placeholder='task0'><button  id='notebtn0'                     >creat</button>`, `<input type='text' class='noteinputs' id='note` + 1 + `' placeholder='task1'><button  class='notebuttons' id='notebtn1' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 2 + `' placeholder='task2'><button  class='notebuttons' id='notebtn2' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 3 + `' placeholder='task3'><button  class='notebuttons' id='notebtn3' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 4 + `' placeholder='task4'><button  class='notebuttons' id='notebtn4' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 5 + `' placeholder='task5'><button  class='notebuttons' id='notebtn5' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 6 + `' placeholder='task6'><button  class='notebuttons' id='notebtn6' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 7 + `' placeholder='task7'><button  class='notebuttons' id='notebtn7' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 8 + `' placeholder='task8'><button  class='notebuttons' id='notebtn8' >creat</button>`, `<input type='text' class='noteinputs' id='note` + 9 + `' placeholder='task9'><button  class='notebuttons' id='notebtn9' >creat</button>`
].sort().join(" ");
document.querySelector('#hi').innerHTML += `<br>` +inputs;

<div id="hi"></div>

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Query and get the container DOM element
Create new element
Put new element to document Tree

//Query some Dib region you Created
let container=document.querySelector("#CalculationInfo .row .t-Form-itemWrapper");
let input = document.createElement("input");


//create new Element  for apex
input.setAttribute("type","text");
input.setAttribute("size","30");
containter.appendChild(input); // put it into the DOM

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The core idea of the solution is:

create a new input element
Add the type text
append the element to the DOM

This can be done via this simple script:

var input = document.createElement('input');
input.setAttribute('type', 'text');
document.getElementById('parent').appendChild(input);

Now the question is, how to render this process dynamic. As stated in the question, there is another input where the user insert the number of input to generate. This can be done as follows:

function renderInputs(el){
var n = el.value && parseInt(el.value, 10);
if(isNaN(n)){
return;
}
  

var input;
var parent = document.getElementById("parent");
  

cleanDiv(parent);
for(var i=0; i<n; i++){
input = document.createElement('input');
input.setAttribute('type', 'text');
parent.appendChild(input);
}
}


function cleanDiv(div){
div.innerHTML = '';
}

Insert number of input to generate: </br>
<input type="text" onchange="renderInputs(this)"/>


<div id="parent">
Generated inputs:
</div>

but usually adding just an input is not really usefull, it would be better to add a name to the input, so that it can be easily sent as a form. This snippet add also a name:

function renderInputs(el){
var n = el.value;
var input, label;
var parent = document.getElementById("parent");
cleanDiv(parent);
  

el.value.split(',').forEach(function(name){
input = document.createElement('input');
input.setAttribute('type', 'text');
input.setAttribute('name', name);
label = document.createElement('label');
label.setAttribute('for', name);
label.innerText = name;
parent.appendChild(label);
parent.appendChild(input);
parent.appendChild(document.createElement('br'));
});
}


function cleanDiv(div){
div.innerHTML = '';
}

Insert the names, separated by comma, of the inputs to generate: </br>
<input type="text" onchange="renderInputs(this)"/>
<br>
Generated inputs: </br>
<div id="parent">


</div>

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<button id="add" onclick="add()">Add Element</button>


<div id="hostI"></div>


<template id="templateInput">
<input type="text">
</template>


<script>
function add() {


// Using Template, element is created
var templateInput = document.querySelector('#templateInput');
var clone = document.importNode(templateInput.content, true);


// The Element is added to document
var hostI = document.querySelector('#hostI');
hostI.appendChild(clone);
}


</script>

HTML Templates are now the recommended standards to generate dynamic content.

小开

Try this:

function generateInputs(form, input) {
x = input.value;
for (y = 0; x > y; y++) {
var element = document.createElement('input');
element.type = "text";
element.placeholder = "New Input";
form.appendChild(element);
}
}

input {
padding: 10px;
margin: 10px;
}

<div id="input-form">
<input type="number" placeholder="Desired number of inputs..." onchange="generateInputs(document.getElementById('input-form'), this)" required><br>
</div>

The code above, has a form with an input which accepts a number in it:

<form id="input-form">
<input type="number" placeholder="Desired number of inputs..." onchange="generateInputs(document.getElementById('input-form'), this)"><br>
</form>

The input runs a function onchange, meaning that when the user has entered a number and clicked submit, it run a function. The user is required to fill out the input with a value before submitting. This value must be numerical. Once submitted the parent form and the input are passed to the function:

...
generateInputs(document.getElementById('input-form'), this)
...

The generate then loops according to the given value inside the input:

...
x = input.value;
for (y=0; x>y; y++) {
...

Then it generates an input inside the form, on each loop:

...
var element = document.createElement('input');
element.type = "text";
element.placeholder = "New Input";
form.appendChild(element);
...

I have also added in a few CSS stylings to make the inputs look nice, and some placeholders as well. To read more about creating elements createElement():

https://www.w3schools.com/jsref/met_document_createelement.asp

To read more about for loops:

https://www.w3schools.com/js/js_loop_for.asp