模拟在输入文本上按[enter]键

Question

我的代码完美地改变了页面加载时自动输入的值,并且它之间有延迟.

但是还有另外一个问题,当我试图模拟按下[enter]输入上的键时,它不起作用,它提交表单并重新加载我的页面.

我如何模拟按下[enter]输入中的键而不提交表单而不重新加载我的页面？我用纯javascript无jQuery

这是我的脚本:

var form  	= document.querySelectorAll("._k3t69");
var input 	= document.querySelectorAll("._7uiwk._qy55y");
var message = "Replacement..." ; 
var maxMsg  = 3 ;
var delay 	= 2.5 * 1000 ; // 2.5 Seconds

var j = 0, k = 0;
function setValue(){
  if( j == maxMsg || j == input.length) {
  	clearInterval(looping)
  } else {
		input[j++].value = message ;
    //And then simulate pressing enter key ON THE INPUT, not sumbit the form
    form[k++].submit();
  }
}

var looping = setInterval(setValue, delay);

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

这是小提琴

Answer 1

默认情况下提交表单将提交表单并重新加载页面.

如果要触发按键事件:

var input = document.querySelector("._7uiwk._qy55y");
var ev = document.createEvent('Event');
ev.initEvent('keypress');
ev.which = ev.keyCode = 13;
input.dispatchEvent(ev);

如果要检查是否输入了按键:

var input = document.querySelector("._7uiwk._qy55y");
input.addEventListener('keypress', function(ev){
  if(ev.keyCode === 13 || ev.which === 13){
    // enter was pressed
  }
});

如果您想阻止在输入/提交时提交表单:

var form = document.querySelector("._k3t69");

form.addEventListener('submit', function(ev){
    ev.preventDefault();
    // you can do something alternative here e.g. send AJAX request to server

    return false;
});

的jsfiddle