// marquee_placeholder.js
// RJM Programming
// November, 2021

  var inpomp=null;
  var origmpv='';
  var bigorigmpv='';
  var cbrmpr=null;
  var mpsubis=0;
  var textwis=0.0;
  var elewdth=0.0;
  var dnsa=false;
  
  function getWidthOfText(txt, fontname, fontsize) { // thanks to https://stackoverflow.com/questions/2057682/determine-pixel-length-of-string-in-javascript-jquery/25467363#25467363
    if(getWidthOfText.c === undefined){
        getWidthOfText.c=document.createElement('canvas');
        getWidthOfText.ctx=getWidthOfText.c.getContext('2d');
    }
    var fontspec = fontsize + ' ' + fontname;
    if(getWidthOfText.ctx.font !== fontspec)
        getWidthOfText.ctx.font = fontspec;
    return getWidthOfText.ctx.measureText(txt).width;
  }
    
  function lookforinpomp() {
    if (!dnsa) {
      if (document.body.innerHTML.indexOf('don' + 'otstickaroun' + 'd=') != -1) {
        dnsa=true;
      } else if (document.head.innerHTML.indexOf('don' + 'otstickaroun' + 'd=') != -1) {
        dnsa=true;
      } 
    }
    if (document.getElementById('s') && !inpomp) {
      if (('' + document.getElementById('s').placeholder) != '') {
        inpomp=document.getElementById('s');
        origmpv=inpomp.placeholder;
        cbrmpr=inpomp.getBoundingClientRect();
        elewdth=eval(-5 + eval('' + cbrmpr.width));
        textwis=eval('' + getWidthOfText(origmpv, 'Arial', '12px'));
        if (inpomp && textwis > elewdth) {
              inpomp.placeholder+=' ' + origmpv + ' ';
              bigorigmpv=inpomp.placeholder;
              mpsubis=1;
        }
      }
    } 
    
    if (!inpomp) {
      var inpqs=document.getElementsByTagName('input');
      for (var jnpqs=0; jnpqs<inpqs.length; jnpqs++) {
        if (!inpomp && inpqs[jnpqs].outerHTML.indexOf('marquee_placeholder') != -1) {
          if (('' + inpqs[jnpqs].placeholder) != '') {
            inpomp=inpqs[jnpqs];
            origmpv=inpomp.placeholder;
            cbrmpr=inpomp.getBoundingClientRect();
            elewdth=eval(-5 + eval('' + cbrmpr.width));
            textwis=eval('' + getWidthOfText(origmpv, 'Arial', '12px'));
            if (inpomp && textwis > elewdth) {
              inpomp.placeholder+=' ' + origmpv + ' ';
              bigorigmpv=inpomp.placeholder;
              mpsubis=1;
            }
          }
        }      
      }
    }
    
    if (inpomp && inpomp.value != '') {
            mpsubis=0;
            bigorigmpv=origmpv + ' ' + origmpv + ' ';
            inpomp.placeholder=bigorigmpv.substring(mpsubis);
            cbrmpr=inpomp.getBoundingClientRect();
            elewdth=eval(-5 + eval('' + cbrmpr.width));
            textwis=eval('' + getWidthOfText(origmpv, 'Arial', '12px'));
            //document.title='' + elewdth + ' vs ' + textwis;
            if (!dnsa) { setTimeout(lookforinpomp, 100); }
    } else if (inpomp && textwis > elewdth) {
    //alert('here1 textwis=' + textwis + ' elewdth=' + elewdth);
            inpomp.placeholder=bigorigmpv.substring(mpsubis);
            mpsubis++;
            if (eval(mpsubis % origmpv.length) == 0) { bigorigmpv+=' ' + origmpv + ' ';  }
            cbrmpr=inpomp.getBoundingClientRect();
            elewdth=eval(-5 + eval('' + cbrmpr.width));
            textwis=eval('' + getWidthOfText(origmpv, 'Arial', '12px'));
            //document.title='' + elewdth + ' vs ' + textwis;
            setTimeout(lookforinpomp, 200);
    } else if (inpomp) {
    //alert('Here2 textwis=' + textwis + ' elewdth=' + elewdth);
            cbrmpr=inpomp.getBoundingClientRect();
            elewdth=eval(-5 + eval('' + cbrmpr.width));
            textwis=eval('' + getWidthOfText(origmpv, 'Arial', '12px'));
            if (textwis <= elewdth) {
              mpsubis=0;
              bigorigmpv=origmpv + ' ' + origmpv + ' ';
              inpomp.placeholder=bigorigmpv.substring(mpsubis);
            } else {
              inpomp.placeholder=bigorigmpv.substring(mpsubis);
              mpsubis++;
              if (eval(mpsubis % origmpv.length) == 0) { bigorigmpv+=' ' + origmpv + ' ';  }
            }
            //document.title='' + elewdth + ' Vs ' + textwis;
            setTimeout(lookforinpomp, 200);
    }
  }
  
  
  setTimeout(lookforinpomp, 3000);