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mrv.js
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mrv.js
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function mrc_view (mrc) {
var display_table = document.createElement("table"); // One table per record, to be put into an ol list
var display_table_tbody = document.createElement("tbody");
// LEADER
var leader = mrc.substr(0, 24); // The leader is always the first 24 characters of a MARC record
var display_table_tr = document.createElement("tr");
var display_table_td_tag = document.createElement("td");
display_table_td_tag.appendChild(document.createTextNode("LDR"));
display_table_td_tag.setAttribute("class","tag");
display_table_td_tag.setAttribute("className","tag"); // for STUPID IE8
var display_table_td_ind = document.createElement("td");
var display_table_td_con = document.createElement("td");
display_table_td_con.appendChild(document.createTextNode(leader));
display_table_tr.appendChild(display_table_td_tag);
display_table_tr.appendChild(display_table_td_ind);
display_table_tr.appendChild(display_table_td_con);
display_table_tbody.appendChild(display_table_tr);
var directory_and_fields = mrc.substr(24); // This extracts the rest of the record after the leader
var mrc_elements = directory_and_fields.split("\x1E"); // The directory ends at the first instance of \x1E
// The \x1e also divides up all the contents of the fields, so we can use mrc_elements to get those contents too
var directory = mrc_elements[0];
var how_many_fields = directory.length/12;
var fields = []; // Array of marc fields!
for (var i = 0; i < how_many_fields ; i++) {
var display_table_tr = document.createElement("tr"); // One row per field
var directory_entry = directory.substr(i*12, 12);
var field_tag = directory_entry.substr(0, 3); // The tag, e.g. 100, the first 3 characters of the directory
// TAG
var display_table_td = document.createElement("td");
var field_tag_text = document.createTextNode(field_tag);
display_table_td.appendChild(field_tag_text);
display_table_td.setAttribute("class","tag");
display_table_td.setAttribute("className","tag"); // for STUPID IE8
display_table_td.setAttribute("valign","top");
display_table_tr.appendChild(display_table_td);
// INDICATORS
var indicators = mrc_elements[i+1].substr(0,2); // The indicators, i.e. first two chars of contents
indicators = indicators.replace(/ /g,"_");
if (field_tag<10) { // N.B here the string field_tag is being used as a number. In this case, Javascript makes the conversion for us.
indicators = " ";
}
var display_table_td = document.createElement("td");
var indicators_text = document.createTextNode(indicators);
display_table_td.appendChild(indicators_text);
display_table_td.setAttribute("class","indicators");
display_table_td.setAttribute("className","indicators"); // for STUPID IE8
display_table_td.setAttribute("valign","top");
display_table_tr.appendChild(display_table_td);
// CONTENTS
var display_table_td = document.createElement("td");
var contents = mrc_elements[i+1].substr(2); // The contents of field, all subfields in together
if (field_tag<10) {
contents = mrc_elements[i+1];
}
// Split into subfields
var subfields=contents.match(/\x1f[^\x1f]*/g); // Subfield codes are shown by \x1f. Find all subfield codes followed by their contents
if (subfields) {
for (var k=0; k<subfields.length; k++) {
subfields[k]=subfields[k].replace(/\x1f/g, "$"); // This line changes \x1f to the traditional $ to make them visible.
var subfield_code_span = document.createElement("span");
subfield_code_span.appendChild(document.createTextNode(subfields[k].substr(0,2)));
subfield_code_span.setAttribute("class", "subfield_code");
subfield_code_span.setAttribute("className","subfield_code"); // for STUPID IE8
var subfield_contents_span = document.createElement("span");
subfield_contents_span.appendChild(document.createTextNode(subfields[k].substr(2)));
subfield_contents_span.setAttribute("class", "subfield_contents");
subfield_contents_span.setAttribute("className","subfield_contents"); // for STUPID IE8
display_table_td.appendChild(subfield_code_span);
display_table_td.appendChild(subfield_contents_span);
}
}
else {
var fixed_field_contents = document.createTextNode(mrc_elements[i+1]);
display_table_td.appendChild(fixed_field_contents);
}
display_table_tr.appendChild(display_table_td);
display_table_tbody.appendChild(display_table_tr);
}
display_table.appendChild(display_table_tbody);
return display_table;
}
function reset_page () {
var element = document.getElementById("records_list");
while (element.firstChild) {
element.removeChild(element.firstChild);
}
var element = document.getElementById("report");
while (element.firstChild) {
element.removeChild(element.firstChild);
}
}
function view_marc() {
reset_page();
var marc_input=document.mrc_input_form.mrc_input_textarea.value;
if (marc_input.match(/^http/g)) {
// Placeholder for planned entry of remote URL feature 8-)
}
else {
marc_records=marc_input.split("\x1d");
marc_records_no=marc_records.length-1;
//REPORT
var plural_s = "s";
if (marc_records_no==1) {
plural_s="";
}
var report_contents = document.createTextNode(marc_records_no + " record"+plural_s+" found.\n");
var report_p = document.getElementById("report");
report_p.appendChild(report_contents);
//INDEX
var index_contents = "";
var index_step=1;
if (marc_records_no>100) {
index_step=10;
}
if (marc_records_no>1000) {
index_step=1000;
}
//INDEX_ENTRY
for (var i=0; i<marc_records_no; i=i+index_step) {
var j=i+1;
index_contents+="<a href='#record"+j+"'>"+j+"</a> ";
}
var index_p = document.getElementById("index");
index_p.innerHTML=index_contents;
//RECORDS
for (var i=0; i<marc_records_no; i++) {
//document.mrc_input_form.test_output.value+= "RECORD NO" + i + mrc_view(marc_records[i]);
var record_list_a = document.createElement("a");
var j=i+1;
record_list_a.setAttribute("name","record"+j);
//record_list_a.appendChild(document.createTextNode("blah"));
var record_list_li = document.createElement("li");
//var record_list_table = document.createElement("table");
//var record_list_contents = document.createTextNode(mrc_view(marc_records[i]));
//record_list_p.appendChild(record_list_contents);
//record_list_table.innerHTML=mrc_view(marc_records[i]);
record_list_li.appendChild(record_list_a);
record_list_li.appendChild(mrc_view(marc_records[i]));
//record_list_li.appendChild(record_list_table);
records_ol=document.getElementById("records_list");
records_ol.appendChild(record_list_li);
}
}
}
var marc_records=[];