Como selecionar um intervalo de caracteres em um textarea usando JavaScript?

https://stackoverflow.com/questions/801325

03-07-2019
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Pergunta

Pergunta simples - existe alguma maneira para selecionar um sub-conjunto do texto exibido em um controle usando Javascript </p>? <P> por exemplo. tem uma função como </p> <P> SelectText (startCharNo, endCharNo, textareaName); </p> <P> Ele também precisa ser IE6 compatível. </P> </div> </div> </div> <div id="boxRight" class="tab-content col-xl-6"> <div id="boxSoluzioneDescrizione" class="boxArticolo"> <div class="row"> <div class="col-md-6"> <div class="row justify-content-start"> <div class="col-md-12"> <form id="feedback" action="/pt/articolo/feedback" method="post"> <input type="hidden" name="_csrf" value="i6jJNj4k9WVTAzg_ZfTXDz5rUR_LSDGtxCPHJNUGwwDuxaxmfXyiMCRhe3gSgYZ2clxiZ_0PAv6nEYhNpzObcQ=="> <div class="hidden" style="display:none;"> <div class="form-group field-feedbackform-pagina required"> <input type="hidden" id="feedbackform-pagina" class="pagina" name="FeedbackForm[pagina]" value="/articolo/details"> <p class="help-block help-block-error"></p> </div> <div class="form-group field-feedbackform-idargomento"> <input type="hidden" id="feedbackform-idargomento" class="idArgomento" name="FeedbackForm[idArgomento]" value="43476"> <p class="help-block help-block-error"></p> </div> </div> <div> Foi útil? <div class="example-block text-center"> <label class="radio-inline" for="happy" style="font-size:1.5em;cursor:pointer;color:green;"> <i class="far fa-thumbs-up" title="This answer is useful"></i>   </label> <input type="radio" id="happy" class="voto input-hidden" name="FeedbackForm[voto]" value="10"> </div> <div class="example-block text-center"> <label class="radio-inline" for="sad" style="font-size:1.5em;cursor:pointer;color:red;"> <i class="far fa-thumbs-down" title="This answer is not useful"></i>   </label> <input type="radio" id="sad" class="voto input-hidden" name="FeedbackForm[voto]" value="0"> </div>  </div> <div class="row footer justify-content-between"> <div class="col"> <button type="button" class="btn btn-primary" data-dismiss="modal">Enviar</button> </div> </div> </form> </div> </div> </div> <div class="col-md-6"> </div> </div> <div class="row "> <div class="col-md-12"> <p class="title" style="background-color:green;"> <i class="far fa-thumbs-up"></i> Solução </p> <div class="testo"> <P> Sim, é possível </p> <pre><code>element.focus(); if(element.setSelectionRange) element.setSelectionRange(startCharNo, endCharNo); else { var r = element.createTextRange(); r.collapse(true); r.moveEnd('character', endCharNo); r.moveStart('character', startCharNo); r.select(); } </code></pre> <P> elemento é a referência para o textarea </p> </div> </div> </div> </div> </div> </div> <div class="row mt-4 adv"> <div class="col-12 text-center"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5108424997424987" data-ad-slot="1879801491"></ins> <script defer async crossorigin="anonymous"> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div> <div class="row mt-4 adv"> <div class="col-12 text-center"> </div> </div> <div class="row mt-4"> <div class="col-12"> <div id="boxSoluzioniAvanzate" class="boxArticolo soluzioni"> <p class="title" style="background-color:black;"><i class="fas fa-file-alt"></i> Outras dicas</p> <div class="testo"> <div id="alt320676" class="boxBorderTop row noMargin pt-4"> <div class="col-md-12 text-left"> <i class="far fa-newspaper fa-2x mb-2" style="display:block;color:gray;"></i> </div> <div class="col-md-12"> <P> createTextRange () </p> <P> <a href="http://www.developerfusion.com/forum/thread/48987/" rel="nofollow noreferrer"> http://www.developerfusion.com/forum/thread/48987/</a> </p> </div> </div> <div id="alt320677" class="boxBorderTop row noMargin pt-4"> <div class="col-md-12 text-left"> <i class="far fa-newspaper fa-2x mb-2" style="display:block;color:gray;"></i> </div> <div class="col-md-12"> <pre><code>selectText(startCharNo, endCharNo, textAreaName){ var content = document.getElementById(textAreaName).innerHTML; 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