JavaScript: Detect whether URL exists before display in IFRAME

Question

HiI am setting the URL in IFRAMEI want to check if url exists or not before settingHow can i detect to avoid error

Joey · Accepted Answer

Hi makenziexcRefer below eaxmpleHTMLltDOCTYPE htmlgtlthtmlgtltheadgt    ltmeta charset34utf834 gt    lttitlegtlttitlegt    ltstyle type34textcss34gt        body  fontfamily Arial fontsize 10pt     ltstylegtltheadgtltbodygt    ltiframe id34frame34gtltiframegt    ltscript type34textjavascript34gt        windowonload  function              var url 34httpswwwaspsnippetscom34            var request            if windowXMLHttpRequest                 request  new XMLHttpRequest             else                 request  new ActiveXObject34MicrosoftXMLHTTP34                        requestopen34GET34 url false            requestsend            if requeststatus  404                 alert34The page is not available34             else                 documentgetElementById34frame34src  url

JavaScript: Detect whether URL exists before display in IFRAME

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