用输入Javascript中的点替换逗号

Question

How to replace automatically all commas from a input with dots?

I have this input:

<input type="text" id="test" onChange="testfunc()"> </input>

And this is my work so far:

function testfunc() {
  var testnr = document.getElementById("test").value;
  testnr = testnr.replace(/,/g, '.');
}

Answer 1

testnr will store the value, so this testnr = testnr.replace(/,/g, '.'); will only change the value without changing the ÌNPUT , please try this:

<input type="text" id="test" onchange="this.value = this.value.replace(/,/g, '.')"/>

Answer 2

Assign it to the DOM element, not the same variable

function testfunc() {
  var testnr = document.getElementById("test").value;
  document.getElementById("test").value = testnr.replace(/,/g, '.');
}

Answer 3

替换后未将其分配回输入的值

Answer 4

you can do it in much simpler way if its just one input element

<input type="text" onChange="this.value=this.value.replace(/,/g, '.');"/>

if there are multiple elements you want to apply this function to , then use in this style

<input type="text" onChange="myFunction(this)"/>

<script>
function myFunction(e) {
    e.value=e.value.replace(/,/g, '.')
}
</script>

Answer 5

check this fiddle it will suggest you to do

Fiddle

Javascript

var testnr = document.getElementById("test").value;
testnr = testnr.replace(' ', '.');
alert(testnr)

HTML

<input type="text" id="test" value="abcd efgh"> </input>