Скачать или смотреть Limiting number of selection user can check from a group of checkboxes by using JavaScript

We can restrict or fix one upper limit for the user to select checkboxes from a set of checkboxes. After reaching upper limit, user can unselect any selection and go for selecting others but the upper limit will be maintained.
https://www.plus2net.com/javascript_t...
All checkbox will have common name and onClick event of the checkbox will trigger one JavaScript function chkcontrol(). This function will also receive the last selected number of the checkbox.
Inside this function we will first read the status ( selected or not ) from all the checkboxes and increase the value by 1 for each selected checkbox. By doing this we will come to know about the total number of checkboxes selected by the user.
if(document.form1.ckb[i].checked){
total =total +1;
}
After knowing the total number of selections we will use one if condition to check the value and if it is more than our set limit then we will display one alert box asking the user to restrict the number of selection to our set limit.
Now we have to uncheck the last selection by user by using the parameter we received ( j ) as input to the function. This is required as we are not in a position to exceed our limit. We will use checked property of the checkbox to unselect it.
document.form1.ckb[j].checked = false
#checkboxselectionlimit #maximumselection #restrictnumberselect