Changing value of button using typescript -

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i'm trying make button (which says "add favorites) change "remove favorites" once it's clicked. i've tried lot of solutions on site (for both java , textscript), nothing seems working.

my code:

button(id='addtofav', onclick='addtofavorites()') add favorites script.   function addtofavorites(){   var x = document.getelementbyid("addtofav").value;   if (x=="add favorites") {       x = "remove favorites";   } else {       x = "add favorites";   }   }

thank help!

assigning new text "x" not update button text. assign this.

 function addtofavorites(){   var x = document.getelementbyid("addtofav").value;   if (x=="add favorite") {       document.getelementbyid("addtofav").value = "remove favorite";   } else {       document.getelementbyid("addtofav").value = "add favorite";   } }

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