javascript - Unable to get value of the property 'checked': object is null or undefined Error -


we have application below java script code giving error,

unable value of property check box

, need change below code in format <%=checkbox1.clientid%>. please change below code in format,

i have multiple lines of code below, because of need use predefined variable "crtlname"

var ctrlname="checkbox"  if(document.getelementbyid(ctrlname + "1").checked) {   document.getelementbyid(ctrlname + "table1").style.display ='inline'; }

i'm not going modify code you, instead here samples may solve question.

if didn't wrong. major question how use inline expression <%=checkbox1.clientid%> in javascript. can following

var checkbox1 = document.getelementbyid('<%= checkbox1.clientid %>');

secondly, mentioned controls generated dynamically means may need achieve variable.clientid in javascript area.

var checkbox2 = document.getelementbyid(     '<%= ((checkbox)this.page.findcontrol(_checkboxid)).clientid %>');

then set _checkboxid in code-behind

public string _checkboxid;  protected void page_load(object sender, eventargs e) {     _checkboxid = "checkbox2"; }

finally, compare solution above prefer using attribute selector

document.queryselectorall("input[id*=checkbox]:checked");

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