如何根据选择更新 div？

Question

I would like, that when user select an option in HTML, I display Block on, an other div.

I put the Function OpenAskuser() in a button, and not work too. It will be even better, without button. Just when user select the option "yes". The Display=Block

Thank you community!!

 function OpenAskuser() { var select = document.getElementById("imputYesNo"); if (select.value === "Yes") { document.getElementById("AskUser").style.display === "block" } }

 <p class=title-box-input>Are you member?</p> <select name="imputYesNo" class=box id="imputYesNo"> <option value="category-default" selected>Choose</option> <option value=Yes>Yes</option> <option value="no">No</option> </select> <br> <div class=user-yes id=AskUser style=display:none;> <p class=title-box-input>Ok, then what is your nickname?</p> <textarea type="text" class=box> </textarea> </div>

Answer 1

You need to attach a change listener that calls the function.

Also, document.getElementById("AskUser").style.display === "block" is a comparison. Use = instead to assign a value to the property:

 function OpenAskuser() { var select = document.getElementById("imputYesNo"); if (select.value === "Yes") { document.getElementById("AskUser").style.display = "block"; } }

 <p class=title-box-input>Are you member?</p> <select name="imputYesNo" class=box id="imputYesNo" onchange="OpenAskuser()"> <option value="category-default" selected>Choose</option> <option value=Yes>Yes</option> <option value="no">No</option> </select> <br> <div class=user-yes id="AskUser" style=display:none;> <p class=title-box-input>Ok, then what is your nickname?</p> <textarea type="text" class=box> </textarea> </div>