根据数组值动态添加复选框

Question

I have the following code and i would like to add check boxes based upon an array of values:

When i run the code it replaces the check box instead of appending a new one.

HTML

   <span id="foo">


           </span>

Javascript

function init() {

    var values = ["value1", "Value2", "Value3", "Value4"];

     for (i = 0; i < values.length; i++) {
        document.getElementById("foo").innerHTML = '<label><input type="checkbox" value="' + values[i] + '_checkbox">' + values[i] + '</label><br>';

     }

}

Answer 1

You can try following code,

function init() {
    var str =''; //INitial a string
    var values = ["value1", "Value2", "Value3", "Value4"];

     for (i = 0; i < values.length; i++) {
       str +='<label><input type="checkbox" value="' + values[i] + '_checkbox">' + values[i] + '</label><br>'; //Append values in string

     }
document.getElementById("foo").innerHTML = str; //Assign string to element

}

Answer 2

You can do it by these way :-

function init() {
    var str    = document.getElementById("foo").innerHTML;
    var values = ["value1", "Value2", "Value3", "Value4"];

     for (i = 0; i < values.length; i++) {
       str +='<label><input type="checkbox" value="' + values[i] + '_checkbox">' + values[i] + '</label><br>';

     }
document.getElementById("foo").innerHTML = str;

}

Answer 3

By this you get only last check box function init() {

    var values = ["value1", "Value2", "Value3", "Value4"];

     for (i = 0; i < values.length; i++) {
        document.getElementById("foo").innerHTML = '<label><input type="checkbox" value="' + values[i] + '_checkbox">' + values[i] + '</label><br>';

     }

}

So concatenate your result ie

for (i = 0; i < values.length; i++) {
      text   += '<label><input type="checkbox" value="' + values[i] + '_checkbox">' + values[i] + '</label><br>';

}
document.getElementById("foo").innerHTML = text;