Styjun

Problem: submit form with "window.onload" create looping infinity.(form submitting non-stop)

When user visit page, I use the saved value to do searching once the page load, with

 window.onload = function() 

if (localStorage.getItem("datePicked"))
 document.getElementById("searchPickDate").value = localStorage.getItem("datePicked");
 

 document.getElementById("searchDateForm").submit();

searchDateForm form:

<form id='searchDateForm' name='searchDateForm' action='' method='POST'>
<input type='date' id='searchPickDate' name='searchPickDate' > 
<input type='submit' value='Search' onclick="return searchDatebtn();" >
</form>

this is the code to save the search value:

function searchDatebtn() 
 var asdf = document.getElementById("searchPickDate").value;
 localStorage.setItem("datePicked", asdf);
 return true;

I tried so many ways and digging the internet so hard but still failed to stop the looping. Any idea?
Thank you

Submit will send you to the url you have set in the form action="" attribute
in your case the attribuie is empty, so the browser assumes it is your current url and it will take you to that url

Submit is kind of bad for user experience
In your case you should retrieve your last picked date
and use it to fetch last searches from server with an ajax request

Instead of submit your form call directly your function.

window.onload = function() 
 searchDatebtn();

And if you don't want to refresh the page, return false in your search function

function searchDatebtn() 
 var asdf = document.getElementById("searchPickDate").value;
 localStorage.setItem("datePicked", asdf);
 return false;

Try to check if the date is already stored in the localStorage to stop the infinite loop :

window.onload = function() 
 if( localStorage.getItem("datePicked") != null ) 
 document.getElementById("searchDateForm").submit();
 

Try this code.

window.onload = function() 
var searchKey = localStorage.getItem('key');
 if(searchKey != '')
 document.getElementById("searchDateForm").submit();
 localStorage.setItem('key', '')